glenmthompson
Well Known Member
Well here is is, we finally did it. Proved what was causing, and found a fix. I was right all along, the fix is in preventing the heat from entering the tunnel through radiant/convective heat transfer through the firewall and belly skin.
Jim called me last night and said he had an idea of insulating the bottom with his super wombat mylar heat shield on the outside, to prevent the tunnel cooking, per my persistant whining and screaming.
So, poor Glen spent an hour degreasing the yet to be painted belly (primer for now) to allow the 18" heat shield to be applied with super duper carpet tape and my heavy duty al. duct tape.
***** Results, the tunnel on the flight we did today was just as cool as it was before we started the engine! My theory has been proven. Whew,... finally, no more screaming and IM's to tone it down.( not quite done screaming yet on this subject...read on)***********
This is what IMHO, yet more experienced than ANYBODY in this area on the RV 10, needs to be done to ALL 10's.:
.
@@@@@@ Install a stainless steel heat shield as suggested by an extremely intelligent 10 builder about ready to fly. Needs to be at least as wide as the tunnel, all the way back to the rear spar carry through. Stand it off, say, oh 1/8" or so, and add fiberfax as a further insulator.
............###Trivia here..Did you know that the abladable heat shield on the Apollo and Mercury spacecraft was mainly fiberfax? Yep.
@@@@@@ No fresh air is necessary in the tunnel after this is accomplished.
@@@@@@The firewall needs to be insulated very well ON THE ENGINE SIDE too, by the above mentioned mylar, SS shield or whatever you want,... the prevent heat introduction through the front is waht needs to be accomplished.
@@@@@@ Call Vans and tell them to [snipped by dr] pay attention to this thread. Listen...How does tis sond to you....? Insulate the inside of the tunnel and blast copius amounts of precious, drag inducing, engine life blood, fresh air, into the tunnel for cooling? Per their SB? Are they nuts? IMHO, nope, just maybe lazy, and not touching their tunnels inflight...Or possibly, some people, tired of Glen pointing out dangerous/annoying things about the RV 10.
@@@@@@ Demand Vans turn the above into an AD....Remember, this engine on N331JH has quit in me 3 times with the elec. fuel pump off due to vapor lock (read boiling fuel). And there has been at least one dead stick landing that many of us attribute to vapor lock....There have been AD's issued on certified A/C for far less. THIS IS AN UNDENIABLE, VERIFIABLE, FACTUAL, REALLY DOES CAUSE ENGINE FAILURE, NEED FOR AN AD!!!!
@@@@@@ Retrofit on flying or substantially completed 10's will be pretty easy. Say, a weekend's work.
@@@@@Scrubbing/cleaning the belly of exhaust stains will be a piece of cake with SS on the belly.
@@@@@ Further fire protection will be awarded to fragile fuel lines in the tunnel area in case of cowling fire.
.
Jim and I will be in the Vans tent at the predesignated 10:00 AM meeting time on 27 and 28 July.....Also, when you look at "The Monarch", please remember she is a flying testbed right now and, yes, we will wash it, finish interior work, and finish the Monarch's spots now that the tunnel problem has been identified and temporarily fixed.
Gawd, what a battle this has been...Good luck and if you treasure your unburned skin and fuel in a liquid state prior to the carb....., take heed.
Glen
Jim called me last night and said he had an idea of insulating the bottom with his super wombat mylar heat shield on the outside, to prevent the tunnel cooking, per my persistant whining and screaming.
So, poor Glen spent an hour degreasing the yet to be painted belly (primer for now) to allow the 18" heat shield to be applied with super duper carpet tape and my heavy duty al. duct tape.
***** Results, the tunnel on the flight we did today was just as cool as it was before we started the engine! My theory has been proven. Whew,... finally, no more screaming and IM's to tone it down.( not quite done screaming yet on this subject...read on)***********
This is what IMHO, yet more experienced than ANYBODY in this area on the RV 10, needs to be done to ALL 10's.:
.
@@@@@@ Install a stainless steel heat shield as suggested by an extremely intelligent 10 builder about ready to fly. Needs to be at least as wide as the tunnel, all the way back to the rear spar carry through. Stand it off, say, oh 1/8" or so, and add fiberfax as a further insulator.
............###Trivia here..Did you know that the abladable heat shield on the Apollo and Mercury spacecraft was mainly fiberfax? Yep.
@@@@@@ No fresh air is necessary in the tunnel after this is accomplished.
@@@@@@The firewall needs to be insulated very well ON THE ENGINE SIDE too, by the above mentioned mylar, SS shield or whatever you want,... the prevent heat introduction through the front is waht needs to be accomplished.
@@@@@@ Call Vans and tell them to [snipped by dr] pay attention to this thread. Listen...How does tis sond to you....? Insulate the inside of the tunnel and blast copius amounts of precious, drag inducing, engine life blood, fresh air, into the tunnel for cooling? Per their SB? Are they nuts? IMHO, nope, just maybe lazy, and not touching their tunnels inflight...Or possibly, some people, tired of Glen pointing out dangerous/annoying things about the RV 10.
@@@@@@ Demand Vans turn the above into an AD....Remember, this engine on N331JH has quit in me 3 times with the elec. fuel pump off due to vapor lock (read boiling fuel). And there has been at least one dead stick landing that many of us attribute to vapor lock....There have been AD's issued on certified A/C for far less. THIS IS AN UNDENIABLE, VERIFIABLE, FACTUAL, REALLY DOES CAUSE ENGINE FAILURE, NEED FOR AN AD!!!!
@@@@@@ Retrofit on flying or substantially completed 10's will be pretty easy. Say, a weekend's work.
@@@@@Scrubbing/cleaning the belly of exhaust stains will be a piece of cake with SS on the belly.
@@@@@ Further fire protection will be awarded to fragile fuel lines in the tunnel area in case of cowling fire.
.
Jim and I will be in the Vans tent at the predesignated 10:00 AM meeting time on 27 and 28 July.....Also, when you look at "The Monarch", please remember she is a flying testbed right now and, yes, we will wash it, finish interior work, and finish the Monarch's spots now that the tunnel problem has been identified and temporarily fixed.
Gawd, what a battle this has been...Good luck and if you treasure your unburned skin and fuel in a liquid state prior to the carb....., take heed.
Glen
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