Fixed Gear Replacement Bumper - Revision history

AndyMillin at 15:25, 12 May 2015

2015-05-12T15:25:16Z

AndyMillin at 15:24, 12 May 2015

2015-05-12T15:24:23Z

Admin: 37 revisions

2010-08-20T18:07:30Z

37 revisions

Bferrell at 14:24, 16 July 2010

2010-07-16T14:24:29Z

Can't load revision 3202

Emteeoh: added some wikilinks

2009-05-12T22:09:21Z

added some wikilinks

Bferrell at 13:04, 5 May 2009

2009-05-05T13:04:59Z

Bferrell at 13:03, 5 May 2009

2009-05-05T13:03:59Z

Bferrell at 12:35, 5 May 2009

2009-05-05T12:35:17Z

Bferrell at 12:34, 5 May 2009

2009-05-05T12:34:49Z

AndyMillin at 13:07, 18 July 2008

2008-07-18T13:07:41Z

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 Part Number     V10Z 7-1011<br/>
-Their catalog can be found here: http://www.punchtools.com/web_assets/pdfs/PDFIndustrial/PDFOtherSupplies/V100.pdf(6 MB download)<br/>
+Their catalog can be found here: [http://www.punchtools.com/web_assets/pdfs/PDFIndustrial/PDFOtherSupplies/V100.pdf] (6 MB download)<br/>
 The part is listed on page 126.  There is a picture.  Dimensions are also given.<br/>
 You can call and order it directly.  The cost is around $50 (including shipping).<br/>

@@ Line 50: / Line 50: @@
 Part Number     V10Z 7-1011<br/>
-Their catalog can be found here: http://www.punchtools.com/PDFSupplies/V100.pdf  (6 MB download)<br/>
+Their catalog can be found here: http://www.punchtools.com/web_assets/pdfs/PDFIndustrial/PDFOtherSupplies/V100.pdf(6 MB download)<br/>
 The part is listed on page 126.  There is a picture.  Dimensions are also given.<br/>
 You can call and order it directly.  The cost is around $50 (including shipping).<br/>

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 A small group of builders/owners has taken up the task of finding a new option.&nbsp;&nbsp;The original research was done by Jorge Bujanda.&nbsp;&nbsp;http://www.jbujanda.com &nbsp;&nbsp;He located an industrial bumper.&nbsp;&nbsp;It is not a sandwich.&nbsp;&nbsp;It is a rubber pad mounted to a steel plate.&nbsp;&nbsp;Jorge’s son is an engineer and ran the numbers for suitability.&nbsp;&nbsp;His analysis showed it would be an excellent replacement.<br/><br/>
 [[Image:damaged_bumper1.jpg|thumb|right|300px|Damaged Part]]
-Since it was not a proven solution, we didn’t think it wise to recommend it to anyone.&nbsp;&nbsp;We wanted to get our hands on it and try it first.&nbsp;&nbsp;The new part was ordered and installed by Kevin Steiner (SELW/FG) and Bruce Topp (XL/FG).&nbsp;&nbsp;The new part mounts vertically on the canard bulkhead.&nbsp;&nbsp;The retaining strap on the current bumper is discarded.<br/><br/>
+Since it was not a proven solution, we didn’t think it wise to recommend it to anyone.&nbsp;&nbsp;We wanted to get our hands on it and try it first.&nbsp;&nbsp;The new part was ordered and installed by Kevin Steiner ([[Steiner_N111VX]] SELW/FG) and Bruce Topp ([[Topp_N125TP]] XL/FG).&nbsp;&nbsp;The new part mounts vertically on the canard bulkhead.&nbsp;&nbsp;The retaining strap on the current bumper is discarded.<br/><br/>
 The pad is hard but flexible.&nbsp;&nbsp;Taxi tests revealed the new shock must be installed under compression.&nbsp;&nbsp;Both Kevin and Bruce fabricated shims and adjusted the force so the gear leg would stay firmly held with a two passenger load in the front.&nbsp;&nbsp;Kevin did this by standing on the canard bulkhead and checking for any gap.&nbsp;&nbsp;I couldn’t to this.&nbsp;&nbsp;I’m pretty sure I would shoot a knee cap across the shop.&nbsp;&nbsp;I’ll have to find another way.&nbsp;&nbsp;:)<br/><br/>
 Once installed, the new shock has taxied, flown, and landed beautifully.&nbsp;&nbsp;There has been no sign of deformation or slop.&nbsp;&nbsp;It appears to be just the right thing.&nbsp;&nbsp;The manufacturer of the bumper is an industrial supplier.&nbsp;&nbsp;Unfortunately, the smallest run they make of the product is in the thousands.&nbsp;&nbsp;At the time the part was located, they had just 17 left on the shelf with no plans to make more.<br/><br/>

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 [[Image:bumper.jpg|thumb|right|100px|New part]]
 [[Image:images_pic1273l.jpg|thumb|right|300px|Old versus new part]]
-'''UPDATE''': The factory has finally installed this new bumper on the Velocity factory trainer and it is currently being tested.  S. Swing earlier says that the retrofit was very easy to do, that he liked the quality and density of the rubber, and thought that we probably will not have problems with the rubber eroding over time. He also said that he would keep us informed of their testing and results.
+'''UPDATE: The factory has finally installed this new bumper on the Velocity factory trainer and it is currently being tested.  S. Swing earlier says that the retrofit was very easy to do, that he liked the quality and density of the rubber, and thought that we probably will not have problems with the rubber eroding over time. He also said that he would keep us informed of their testing and results.'''
 For those of us that fly with the gear “down and cured”  …&nbsp;&nbsp;If you have worked on the nose gear of the FG, you probably know there is a rubber bumper used as a shock absorber on the nose gear.&nbsp;&nbsp;Like several other parts, this was a “found part.”&nbsp;&nbsp;It is an automotive engine mount that seemed to fit the bill.<br/><br/>

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 [[Image:bumper.jpg|thumb|right|100px|New part]]
 [[Image:images_pic1273l.jpg|thumb|right|300px|Old versus new part]]
 For those of us that fly with the gear “down and cured”  …&nbsp;&nbsp;If you have worked on the nose gear of the FG, you probably know there is a rubber bumper used as a shock absorber on the nose gear.&nbsp;&nbsp;Like several other parts, this was a “found part.”&nbsp;&nbsp;It is an automotive engine mount that seemed to fit the bill.<br/><br/>
 I have not flown yet, so I can only relate what I have been told.&nbsp;&nbsp;The rubber portion of the mount is sandwiched between plates of steel.&nbsp;&nbsp;When compressed, the steel will deform and does not relax to the original shape.  The bent steel introduces slop.&nbsp;&nbsp;Over time, possibly a lot of slop.&nbsp;&nbsp;I am told that Velocity has recommended replacing the shock, or shimming from behind.&nbsp;&nbsp;Shimming will remove the slop, but not the original problem.&nbsp;&nbsp;The steel may deform even more.<br/><br/>

← Older revision	Revision as of 18:07, 20 August 2010
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← Older revision		Revision as of 12:34, 5 May 2009
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		+	[[Image:bumper.jpg]]
	[[Image:images_pic1273l.jpg\|thumb\|right\|300px\|Old versus new part]]		[[Image:images_pic1273l.jpg\|thumb\|right\|300px\|Old versus new part]]
	For those of us that fly with the gear “down and cured” …  If you have worked on the nose gear of the FG, you probably know there is a rubber bumper used as a shock absorber on the nose gear.  Like several other parts, this was a “found part.”  It is an automotive engine mount that seemed to fit the bill.<br/><br/>		For those of us that fly with the gear “down and cured” …  If you have worked on the nose gear of the FG, you probably know there is a rubber bumper used as a shock absorber on the nose gear.  Like several other parts, this was a “found part.”  It is an automotive engine mount that seemed to fit the bill.<br/><br/>

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 <li>Install the nose gear fork and tire.</li>
 <li>Turn the fork backward (point to the nose).</li>
-<li>Allow the gear leg to rest against the new bumper.</li>
+<li>Remove any sawhorse or other support; placing the weight of the aircraft on the nose gear forcing it to compress against the new bumper.</li>
 <li>Put enough weight in the front end to compress the shock.  (on the canard
 bulkhead, on the floor close to the canard bulkhead, you in the nose, etc.)</li>