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06-10-2008, 07:04 PM
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Join Date: Nov 2006
Location: Bennington, Vermont USA
Posts: 1,301
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Cooling Air Blast Tubes?
Does anyone know if the corrugated nylon Wiring Conduit supplied by Van's is the same as the corrugated nylon Cooling Blast Tube material? The on-line catalogue says the wiring conduit is good for FWF use provided it's kept 4" to 6" away from the exhaust. The blast tube material has no such restriction noted - but it seems prudent to keep it clear of the exhaust.
I seem to have miles of the wiring conduit and may use some to supplement the Cooling Blast Tube material.
Jim Sharkey
RV6 - Finishing Up
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06-10-2008, 07:08 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Jim,
I used the wiring conduit for blast tubes cool my P-mags and to cool the alternator. 150 hours and no problems.
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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06-10-2008, 09:34 PM
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Join Date: Jun 2005
Location: Cedar Park, TX
Posts: 3,152
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I used them for blast tubes too. They WILL deform if they get too hot. I have one on the alternator and fuel pump that are a little funny looking due to the heat. The ones on the mags are holding up fine. Next time, I'm using "the real stuff" (sceet tube).
__________________
Scott Card
CQ Headset by Card Machine Works
CMW E-Lift
RV-9A N4822C flying 2200+hrs. / Cedar Park, TX
RV8 Building - fuselage / showplanes canopy (Done!)
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06-10-2008, 09:48 PM
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Join Date: Jul 2006
Location: Corvallis Oregon
Posts: 3,547
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My alternator
blast tube looks funny too..then I discovered I had a small exhaust leak right where the tube was..  |
06-11-2008, 06:40 AM
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Join Date: Mar 2005
Location: Dallas area
Posts: 10,762
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That's a good thing...
Quote:
Originally Posted by frankh
blast tube looks funny too..then I discovered I had a small exhaust leak right where the tube was.. |
Had you used something else, you might not have noticed the leak.
__________________
Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
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06-11-2008, 09:25 AM
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Join Date: Jul 2006
Location: Corvallis Oregon
Posts: 3,547
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Thats a very good point
Good point Mel,
Actually it is a new Vettermen exhaust, the joint is one of the slip joint s that was slightly deformed..I just wrapped the 2" of the joint in exhaust wrap that seems to be holding up well.
Frank
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06-26-2008, 06:59 PM
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Join Date: Feb 2008
Location: Jupiter,FL
Posts: 72
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I instrumented my mags and alternator with temp probes during the fly off period. Hot day, max temp for alternator was 120 deg F, mags 115 deg F.
After shutdown, mags and alternator temp incresed to engine core temperature (oil temperature) of approx 180 deg, and then the whole thing cooled off as one big mass.
Max temp for a Bendix mag per a Bendix engineer is 250 deg F.
This is with NO blast tubes intalled. Engine...IO-540 F1 Rocket
Best wishes, Bob
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