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  #1  
Old 08-20-2022, 01:40 PM
rvanstory's Avatar
rvanstory rvanstory is offline
 
Join Date: Dec 2016
Location: New Braunfels
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Default RV10 Real World Performance at Various Altitudes

Finally got an oxygen bottle for higher levels. So, took the 10 up today to see how it performed at various higher altitudes. I have a standard compression IO-540 and 2-blade Hartzell prop. Tested at 8,500 / 10,500 / 12,500 / 14,500 / 16,500 and 17,500 all running lean of peak @ 2,400 rpm and WOT. I was surprised how little KTAS degraded at the higher altitudes (from 169KTAS to 162 KTAS) and it performed equally well from 8,500 to 12,500 ft. It seemed to be happiest at 12,500 with lower GPH fuel burn and 168 KTAS.

Also surprised how efficient it got at higher altitudes. At 17,500 Garmin showed 19.5 statute miles per gallon! Here's pics of the performance at 2,000 increments....
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  #2  
Old 08-20-2022, 01:58 PM
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Carl Froehlich Carl Froehlich is offline
 
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Try 2500 RPM, WOT. Fuel burn is about the same but I got another knot or two out of the plane at the higher RPM.

This is prop dependent - on my RV-8 I found 2500 RPM to be a happier place on the engine when high. Opposite of expected results. This is with the 74Ē Hartzell BA prop. Your prop/airframe combo may be different.

Carl
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  #3  
Old 08-20-2022, 04:18 PM
Strikhedonia Strikhedonia is offline
 
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Thank you for sharing this Randy. I've been meaning to do this myself to chart it all out. Interesting that at 12.5k and 14.5k the same GPH, same with 16.5k and 17.5k.
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  #4  
Old 08-20-2022, 06:29 PM
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mike newall mike newall is offline
 
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RV-12, 15,000' held 500 fpm all the way above 10k. About 4gph and 110kts TAS.

Not bad for a snowmobile motor ;-)


Ohhhhh - sorry

Thread drift
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  #5  
Old 08-20-2022, 07:21 PM
Taltruda Taltruda is offline
 
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I donít found the same thing with my -4.. I like to go to 12500, but have gone to 17500 if I need the range. What havenít you used the lean assist function? I would think thatís an easy way to get repeatable results very quickly.
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  #6  
Old 08-20-2022, 08:53 PM
Mconner7 Mconner7 is offline
 
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Location: Bradenton FL
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Those are great numbers, are you using EFI or EI ?
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  #7  
Old 08-21-2022, 06:51 AM
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rvanstory rvanstory is offline
 
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Quote:
Originally Posted by Mconner7 View Post
Those are great numbers, are you using EFI or EI ?
Using SureFly EI on left side and standard Slick mag on right.
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Flying RV10 - N783V
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1st Flight 08/20/2020 / Current Hrs - 334
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  #8  
Old 08-21-2022, 09:34 AM
lr172 lr172 is offline
 
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Quote:
Originally Posted by rvanstory View Post
Using SureFly EI on left side and standard Slick mag on right.
Don't know much about surefly, but you may want to play with advance a bit at higher altitudes. My advance is adjustable on the fly and I get a bit less than 9.5 GPH/165KTAS at 14 or 15K. I tend to be closer to peak than at lower altitudes to maintain the 165 and therefore use less advance. The very low MAP seen at the higher altitudes tends to push the advance way out there on many tables, but if you are not also really lean, it is detrimental.

Larry
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Last edited by lr172 : 08-21-2022 at 11:58 AM.
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  #9  
Old 08-21-2022, 10:06 AM
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Reflex at all altitudes?
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  #10  
Old 08-21-2022, 12:28 PM
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rvanstory rvanstory is offline
 
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Quote:
Originally Posted by BillL View Post
Reflex at all altitudes?
Yes. Reflex at all altitudes.

Regarding EI advance, not adjustable with SureFly. Advance is either on (at their curve) or off with fixed timing. I was flying right at peak at higher altitudes. CHTís ran cool enough, even at peak. SureFly is simple, but not adjustable.
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1st Flight 08/20/2020 / Current Hrs - 334
Donation Happily Made 2022
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