267 lines
14 KiB
Plaintext
267 lines
14 KiB
Plaintext
SOURCE ERROR: ST-7400 Semroc has aberrant PN ST-7400 for ST-7 4" length, should be ST-740
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SOURCE ERROR: INVESTIGATE Modern eRockets/SEMROC site has separate BT-60 and ST-16 listings
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but gives ST-16 dimensions for everything. Legacy Semroc site has Centuri ST-16 dimensions of
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ID = 1.600, OD = 1.640 and Estes compatible BT-60 dimensions of ID = 1.595, OD = 1.637 ***
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Using Estes compatible dimensions for BT-60, i.e. assuming legacy site is correct.
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SOURCE ERROR: T-3.0 inconsistent sizes for T-3.0 said to be "same as the Aerotech and LOC 3" tubes"
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but lists ID=2.950, OD=3.000, wall 0.050, which are internally inconsistent
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LOC tubes are in fact ID 3.000, OD 3.100, wall=0.050, so I use that.
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SOURCE ERROR: T-3.0 incorrect mfr attribution for T-3.0: Aerotech has never offered a 3" tube
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or kit; in early 2017 I personally confirmed this with Charlie Savoie, GM of Aerotech.
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SOURCE ERROR: PST-65 dimension discrepancies ***
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Semroc clear tube PST-65 (also called "BT-65 Clear" on the legacy site) and the corresponding BNC-65xx nose
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cone dimensions show significant discrepancies. Here is a table (all dimensions in inches)
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SOURCE OD ID WALL REMARKS
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Estes 1974 CPC 1.641 1.595 (.023) This is known to be an error in the CPC
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Estes 1974 cat, PST-65R 1.796 1.750 (.023) Same values appeared in all 1970s print catalogs
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Semroc 2017 site, PST-65 (1.799) 1.737 .031 Specifies "diameter" (presumed ID) and wall only
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Semroc 2017 site, BNC-65xx NA NA NA Modern site does not give nose cone diameters
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Semroc legacy site, PST-65 1.774 1.750 (.012) Likely to be an error
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Semroc legacy site, BNC-65xx 1.796 1.750 (.023)
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DISCUSSION
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The Estes 1974 Custom Parts Catalog values are completely wrong and can be ignored.
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The Semroc legacy site values for the BNC-65xx nose cones BNC-65L and BNC-65AF agree exactly with the
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Estes values.
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The modern Semroc site has PST-65 values that work out to a compatible OD but a discrepant ID.
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The legacy Semroc site gives an OD in the tube listings that is likely to be discrepant as it implies a very
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thin wall. it is worth noting that the digits "96" are exactly offset 2 keyboard positions from the
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"74" seen in the questionable 1.774 value.
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At NARAM-58 I had a conversation with Randy Boadway (proprietor of eRockets and modern Semroc) about the
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plastic tube sizes. He mentioned that the sizing of the clear tubes was inconsistent from one lot to the next.
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This could possibly account for the smaller ID value given on the 2017 site.
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For now I am adopting the Estes print catalog values as the most likely to be correct, and so that the PST-65
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related parts definitions in this database will all interchange correctly.
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SOURCE ERROR: CPT-720 legacy semroc site lists 1.87" length. Should be 2.0"; has been corrected on 2017 site
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SOURCE ERROR: CPT-10 ALL Semroc legacy site erroneously replicates the CPT-8 dimensions for the CPT-10.
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Semroc/eRockets dimensions from the 2017 site are inconsistent with ID 1.039", OD 1.060", wall .021" ***
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Here I have set the dimensions to match up with actual ST-10 (ID of 1.00) and use the likely correct
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.021 wall to give an OD of 1.042
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SOURCE ERROR: on the legacy Semroc site, PST-55 and PST-55-6 are both listed with 12" length and identical weight ***
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SOURCE ERROR: Semroc legacy site gives length of PST-65L as 5.0", same as PST-65R. Should be 12". ***
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SOURCE ERROR: Semroc quotes CPL-5-34 OD as 0.516 which is greater than BT-5 ID of .515"
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SOURCE ERROR: Semroc site has PN SEM-CPL-5-1.5 but other text giving CPL-5-1.75 and
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description says 1.75" so I went with 1.75"
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SOURCE ERROR: Semroc lists a CPL-ST10-3" but dimensions are for an ST-20 tube
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SOURCE ERROR: eRockets Semroc 2017 listings for CPL-52H-34 give OD=1.140, ID=0.980. The OD is
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exactly the same as the ID of the BTH-52 tube, which is virtually impossible. I
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offset the ID and OD down by .002 to be more realistic.
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SOURCE ERROR: CPL-55-34 here again the quoted OD of the coupler is exactly the ID of the tube.
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SOURCE ERROR: HTC-13 1975 Centuri catalog has HTC-13 length = 1.5", legacy Semroc
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site erroneously gives 1.75". It's correct again in eRockets/Semroc 2017 site
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SOURCE ERROR: legacy Semroc site has JTC-60C length = 1.75", new eRockets/Semroc site has 1.5"
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Estes 1980 catalog gives 1.5".
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SOURCE ERROR: AER-11804 eRockets/Semroc 2017 web listing for AER-11804 gives internally inconsistent
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values of OD 1.804", ID 1.610", wall 0.083". The OD is too big as the primary
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tube ID is only 1.80", and the ID doesn't agree with the given wall thickness. I
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set the OD to a plausible 1.795", took the wall thickness at face value, and set
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the ID to 1.629 accordingly.
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SOURCE ERROR: CPL-ST20-4 eRockets/Semroc 2017 listing for CPL-ST20-4 gives internallly inconsistent values
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of ID 1.952, OD 1.981, .036 wall. I took the wall thickness as likely to be
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correct and used an OD with offset of .005 from the ID of an ST-20.
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SOURCE ERROR: (?) CPL-3.0=34 OD quoted of 2.92" is a very sloppy fit if the
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intended mating tube is LOC 3.0" tube with its 3.00" ID. LOC couplers are OD
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2.99, ID 2.88, wall 0.055; I adopted that for now *** Investigate ***
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SOURCE ERROR: CPL-3.0"-6" inconsistent length. PN given as CPL-3.0"-6", but in description
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it is CPL-3.0"-4" and describes 4" length. I adopted 6" *** investigate ***
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SOURCE ERROR: CPL-100-6 dimensions on eRocokets/Semroc 2017 site are completely wrong, with
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OD 2.920", ID 2.900", wall .034". The OD would be appropriate for the
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CPL-3.0". I adopted a correct OD to mate with BT-100, and took the wall thickness
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as correct
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SOURCE ERROR: CPL-101-6 Data missing for BT-101 couplers. I adopted proper mating OD for
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BT-101 and took wall .034 as used in other Semroc couplers *** investigate ***
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SOURCE ERROR: The 2018 Semroc/e-rockets site does not list masses for any BR-xxx balsa reducers.
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Many have masses given on the Semroc legacy site, but the new ones do not.
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SOURCE ERROR: BR-5-T20 price listed at $9.99 on new site though all others of similar size are $3 to $3.50.
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No drawing shown.
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SOURCE ERROR: BR-5-T20A price listed at $9.99 on new site though all others of similar size are $3 to $3.50.
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No drawing shown.
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SOURCE ERROR: BR-813 correct overall exposed length is unclear.
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Semroc legacy site: 1.70" Disagrees significantly with drawing
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Scaled drawing (legacy): 1.99" (cyl section 0.34" plus 1.65" conical taper - pixel scale 224/in)
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Semroc/e-rockets new site: 1.75" (1 3/8" plus 3/8" straight section)
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Scaled drawing (new): 1.87" (cyl section 0.32" plus 1.56" conical taper - different pixel scale 324/in)
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The stated length disagrees with the drawing on both the legacy and new sites. There was obviously an attempt
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to improve the description on the new site, and the drawing was changed, but they still don't agree.
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I'm breaking the tie by using the new drawing value of 1.87
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SOURCE ERROR: BR-1118 Legacy Semroc table gives 1.50" length, but drawing scales to 2.0"
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New site does not list length, and has same drawing. Adopting the drawing value.
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SOURCE ERROR: BR-1320 Legacy Semroc site gives length as 0.75". Drawing scales to 2.0".
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Mass listed is 0.28 oz which seems low for a 2" long adapter; it's the same as for the
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1.0" long BR-1316M. The drawing also shows a cylinder section. Overall I think the drawing is
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more likely to be wrong, so using the spec value of length 0.75", and the usual #13 shoulder of 0.69"
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SOURCE ERROR: BR-1620 Semroc legacy site gives 1.5" exposed length, but the drawing scales to 1.75".
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Adopted the spec length because this drawing again looks like a special one with cylindrical section
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at the larger end
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SOURCE ERROR: BR-1820 and BR-1820L are seemingly conflated on the new Semroc/e-rockets site.
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For the unit on this page: http://www.erockets.biz/semroc-balsa-reducer-18-to-20-1-7-8-long-sem-br-1820/
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Title: SEMROC BALSA REDUCER #18 TO #20, 1 7/8" LONG SEM-BR-1820
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Description text: BR-1820L
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Drawing caption: BR-1820
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Length, specified: 1 7/8"
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Length, scaled dwg: 1.78"
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The L suffix usually means "long", and this is confirmed by the URL.
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The drawing says "BR-1820", but the photo of the product shows a long reducer that generally
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matches the drawing.
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For the unit on this page: http://www.erockets.biz/semroc-balsa-reducer-18-to-20-sem-br-1820l/
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Title: SEMROC BALSA REDUCER #18 TO #20 SEM-BR-1820L
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Description text: Semroc Balsa Reducer #18 to #20 SEM-BR-1820L
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Drawing caption: BR-1820L
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Length, specified: - not given -
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Length, scaled dwg: 0.42"
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Here the nomenclature is consistent, but the drawing shows a very short exposed length inconsistent
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with the L designation.
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SOURCE ERROR: BR-085-175 length not specified on new Semroc/e-rockets site
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SOURCE ERROR: BR-085-225 length not specified on new Semroc/e-rockets site
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SOURCE ERROR: BRS-84-115 (only found on 2018 Semroc/e-rockets site) has no length given.
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SOURCE ERROR: BRS-115-16 drawing is captioned "BRS-116-16" on new site
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SOURCE ERROR: BR-115-168 "special" has no given dimensions. Description on 2018 site says only
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"Semroc Balsa Reducer #115 to #168 SEM-BR-115-168 Special". All dims scaled from drawing:
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both shoulders 1.0", len 1.19", ID of rear tube 1.68", OD of rear tube 1.75"
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BR-115-168 description doesn't say what a #168 tube is. I have
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no record or memory of a "#168" tube anywhere and a Google search turns up nothing useful.
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SOURCE ERROR: BR-115-225 no exposed length given on 2018 Semroc/e-rockets site.
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SOURCE ERROR: BR-125-175 has no exposed length given, no drawing, and only a very oblique photo.
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SOURCE ERROR: BR-125-175L has no exposed length given.
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SOURCE ERROR: BR-125-225 has no exposed length given on new site.
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SOURCE ERROR: TA-520 drawing on legacy site has incorrect length, scales to 0.6" (should be 0.75").
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Drawing on new e-rockets site is correct.
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SOURCE ERROR: TA-2058 legacy site scaled drawing gives length 1.8", whereas
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specified length is 2.0"
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SOURCE ERROR: TA-7080 has length 1.5" in table on legacy site, but View page gives length 2.25".
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Scaled drawing gives 2.25", so the table is wrong.
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SOURCE ERROR: TA-7080H has length 1.5" in table on legacy site, but View page gives length 1.0".
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Scaled drawing also gives 1.0", so legacy site table is wrong.
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SOURCE ERROR: EB-5 OD on 2017 eRocket site of .516 is wrong, must be less than 0.515
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SOURCE ERROR: FB-20 has an erroneous duplicate listing as NB-20P
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SOURCE ERROR: BTC-6 Semroc legacy site gives 0.615 for OD of BTC-6. It can't be that
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big; they list ID of ST-6 tube as 0.610
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SOURCE ERROR: BTC-115 Semroc legacy site gives OD of BTC-115 as 1.15". ID of Series 115
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tube is given as 1.14" by multiple sources
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SOURCE ERROR: (?) BC-933 description is identical to BC-932, they both say BNC-50X for ST-9
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SOURCE ERROR: BC-943 and BC-944 Semroc legacy and new sites both show length of 4.3" for BC-943 and
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4.4" for BC-944. They are supposed to be modeled after the Estes PNC-50Y and
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BNC-50Y, respectively. However the official Estes specs for those items have
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identical lengths of 4.375".
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SOURCE ERROR: BNC-50G3 Semroc legacy and new sites both describe BNC-50G3 as a #9 cone
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SOURCE ERROR: BNC-50G4 Semroc legacy and new sites both describe BNC-50G4 as a #9 cone
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SOURCE ERROR: BC-1023 given length on legacy site is 2.3", but scaled dwg is 2.25".
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Looks like part number length rounding propagated into the description.
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SOURCE ERROR: BC-1023C given length on legacy site is 2.3", but scaled dwg is 2.25".
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Looks like part number length rounding propagated into the description.
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SOURCE ERROR: BC-1028 length on legacy site is 2.8", but scaled dwg is 2.75".
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Looks like part number length rounding propagated into the description.
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SOURCE ERROR: BC-1038 given length on legacy site is 3.8", but scaled drawing gives 4.13".
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SOURCE ERROR: BC-1043 length given on legacy site as 4.3", but drawing scales to 4.46"
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SOURCE ERROR: BC-1048 length given on legacy site as 4.8", but drawing scales to 4.98"
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SOURCE ERROR: BC-1121 len is given as 2.1" but drawing scales to 2.15"
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SOURCE ERROR: BC-1135 len is given as 3.5" but drawing scales to 3.55"
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SOURCE ERROR: BC-1159 len is given as 5.9" but drawing scales to 5.81"
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SOURCE ERROR: BC-1350 appears in the legacy site table http://www.semroc.com/Store/Products/NoseCones.asp
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but does not appear in the All > nose cones > balsa parts product query
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SOURCE ERROR: BC-1648 length is supposed to be 4.8" but legacy drawing scales to 4.6" and superposition
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shows it to be exactly the same drawing as for BC-1646 but with the label changed to BC-1648. This error
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has propagated to the new eRockets site. Are manufactured BC-1648's actually only 4.6" long?
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SOURCE ERROR: BNC-70 and BHC-70Hxx are not separated on new Semroc site, but BNC-80 and BNC-80Hxx are
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SOURCE ERROR: BC-T2032C legacy site gives length 3.2", but scaled drawing is 3.25". Looks to be a
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roundoff error where Carl changed a 3.25" length to a "32" part number suffix.
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SOURCE ERROR: BC-T3033 legacy site gives length 3.3" but scaled drawing is 3.35".
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Apparently another part number length roundoff.
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SOURCE ERROR: BC-T3541B legacy site gives length 4.1" but scaled drawing is 4.05".
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Apparently another part number length roundoff.
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SOURCE ERROR: Semroc legacy site lists inconsistent thicknesses for the various sizes of
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parachutes...I doubt that these are all correct. Here is the list:
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12" 1 mil
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14" 1.5 mil
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16" 1.5 mil
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20" 1.1 mil
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24" 1.1 mil
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32" 1.5 mil
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36" no thickness given
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For now I have used the stock 1 mil HDPE Estes type material for all of the Semroc
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sizes until we get better information.
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