Thanks all for the replies.

100-200 RPM would not make much of a difference (I would think). 1000 or more probably would.

I wouldnt expect it to be so much.

Dar.

Im running deflectors on both OS46AX and OS55AX which I recall you had the OS55AX.

I run off dirt strips so had a filter on the OS55AX. Have now removed and replaced with two layers of ladies stockings to prevent the bigger stuff being ingested. (dont tell my wife). If the loss is closer to 1100RPM I should remove the deflector.

I have read reviews of flyers commenting the OS55AX has plenty of power.

Ive run 11 X 7 and currently 12 X 6 APC props.

I fly in the tropics (30-34C) with a 40-46 size pattern plane.
I operate dual batteries and converted to trike so a bit extra weight there.

I would not say its overpowered.

It may be a combination of Hot humid climate, 10% nitro, air filter and deflector.

I will put up with the lack pf power if its the air filter as the dirt where im flying is too much to run without some sort of filtering (IMHO).

If its over 1000RPM drop from using a deflector, I think I will remove it.

Cheers