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Anti Splat Cowl flaps performance

Bill.Peyton

Bill.Peyton

Well Known Member
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I now have almost 1200 hours on my 10. The cowl is completely stock. I normally cruise LOP. I would like to raise my CHTs during level cruise, and improve my cooling a bit on climb out in the hot summer. I see several of you are building with the cowl flap kit, just wondering if anyone has a comparative data point and started with the stock vans provided louvers and later modified the cowl using the AS Cowl flap kit. Also, any speed difference noted if any?
 
On my IO-360 7A I do note about 20-30 degree difference from open to closed and when open I lose 3-4 knots. They have been installed since first flight and I never installed the stock louver kit.
 
Bill, why on earth would you want to raise your CHT's? I doubt they are anywhere near 200dF or less, and Lycoming publish a minimum well below 200.

A good RV10 setup will cruise LOP in the 310-345 range most days, and climb at 125 knots with 360-370dF ROP. If you cannot stay below 400 there are other issues that need addressing.

I would caution anyone applying a solution to a problem they do not have.


Just remembered, I have a client with a rocket. He installed these flaps to his cowls and achieved no change. Fixing a bunch of there things did.
 
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+1 on Antisplat Cowl

I also have an IO-360 in a 7A, and my results are identical to the earlier poster. 20-30 degree difference on hot summer climb out. It has made ALL the difference for me. More time for watching other instruments and traffic, and less time with my eyes glued to the CHT's......Worked for me, YMMV.
 
bkc3921 said:
I also have an IO-360 in a 7A, and my results are identical to the earlier poster. 20-30 degree difference on hot summer climb out. It has made ALL the difference for me. More time for watching other instruments and traffic, and less time with my eyes glued to the CHT's......Worked for me, YMMV.
Click to expand...

7A's seem to have more issues for some reason. The 10's not so much.
 
My 10 will probably be dependent on the cowl flap I installed, because for now at least, I left the louvers out. We'll find out soon!
 
I had serious issues with high cylinder head temperatures on climb out on my RV6A with the 0-360. The warmest cylinder is number 3 which would go as high as 470 on takeoff on a hot day in Arizona. I considered all the suggested culprits like baffling, carburetor, timing, etc. Even after insuring everything was tuned properly and the baffling was checked by two different mechanics, it still ran hot. I installed the Anti splat cowl flaps and WOW!, my CHT dropped 45 degrees on climb out. These cowl flaps are everything I had hoped. The install was fairly straight forward, with the hardest part for me being soldering wires onto the very small pins on the back of the switch. I highly recommend these. For me they were a complete solution and game changer.
 
Same with my RV-8A I no longer need to step climb to 10-15k from sea level when it is 95+ degrees outside. Without cowl flaps I would level off to keep at or below 420 (personal limit) and then climb again when cooled 380 or so, and repeat the process to my desired altitude.
 
Same thing for my RV9a. Step climb only. After installing 2 cowl flaps from Antisplat my heat issue was over.
 
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