Anti Splat Aero cowl flap

[ALagonia]

Anybody have any experience with this product? How much drop did you see in your CHT?s in climb and cruise?

[airguy]

I don't use it for cruise or easy climb, but for a max performance climb during the summer it certainly helps keep my CHT's reasonable - I'm going to say 15-20 degrees cooler on the CHT's and my oil temps maybe 10.

[swisseagle]

Originally Posted by airguy

I don't use it for cruise or easy climb, but for a max performance climb during the summer it certainly helps keep my CHT's reasonable - I'm going to say 15-20 degrees cooler on the CHT's and my oil temps maybe 10.

Hello RV-7A, IO-320, a good 10+ deg. cooler. It is only effective during climb out. On speeds higher than Vy (93kt in my case) there is nearly no effect and cylinder cools better due to airspeed. Anyway, after about 2000ft AGL, changing to cruise-climb speed 100-110kt, then closing the cowl flap.

Only on one side, one installed.

[fred mann]

I have two installed in my -7 with a new O-360. I wasn't able to keep the CHT's bellow 420 on take off even with 115 knots IAS. With the two cowls open now my CHT's stay around 400 and once the speed picks up they drop down to under 350. They don't seem to have much effect on my oil temps that are usually around 180 anyway. So I have about 20 degrees drop with the cowls.

[VIN2020]

I put two on each side of the lower cowl of my RV-7. It solved my oil temp problems!

[ALagonia]

Originally Posted by VIN2020

I put two on each side of the lower cowl of my RV-7. It solved my oil temp problems!

?Two on each side of your cowling??
I only have one cylinder that is higher than the others. I?m thinking maybe one cowl flap rather than trimming my lower cowl. That cowl flap on the left side since it is #4 CHT that is high.

[cduster]

Originally Posted by ALagonia

“Two on each side of your cowling?”
I only have one cylinder that is higher than the others. I’m thinking maybe one cowl flap rather than trimming my lower cowl. That cowl flap on the left side since it is #4 CHT that is high.

I don't know if it would really matter where you put it exactly. I had a 260 Comanche with the LoPristi cowling that worked great at cooling the 260hp Lycoming. It used a single cowl flap located on the left side just below the wing root. Temps did not shift left or right with cowl flap use.

[RicoB]

I installed 2 on my 9 and really helped out on the climb.

[jpowell13]

My number 3 cylinder was getting a little above 400 degrees on hot days. So, I just put one flap on the right side. I get a drop of about 5 degrees F. I find that very helpful on climb out on hot days and in level cruise when heavily loaded at high altitude in the summer. I love having it when crossing mountains.

The effectiveness of the flap is easy to estimate in cruise since you can open and close it and watch the effect on the cht's. The 5 degree difference holds true for me in level flight. The installation is surpringly easy. I agree with Cduster. If you only install one, it probably doesn't matter which side you put it on. John

[ALagonia]

How did you attach the cowl flap to the lower cowl? Epoxy, rivets?