Prop size 91 os

[demobob]

Hello guys, Im putting together a Aeroworks 60-90 Yak 54. I need some advice on prop size. Il be flying more IMAC style than 3D. Any recommendations would be appreciated. Thanks Bob

[Yak-Fever]

I would suggest started with a 14 x 6 APC, or 14 x 8...good starting point...I did 3-D with my OS 91 - 2 stroke with a 15 x4 wide and 16 x4 wide...(APC)...hope this helps...happy flying...

[demobob]

Thanks for the reply Yak, it will save me some $$ when I get it going. Bob

[Goodie_2_Shoes]

Hey buddy, I have been flying a .60 size 3d plane with an OS 91 four banger in it. I tried a few different props, most I couldn't get any vertical performance out of the engine. I am currently running an APC 15x4W @ about 9000rpm it is wicked, spools up very quickly great vertical performance. I would look at running an APC 15x6 though it spools up just a little too quickly for me but it will do for the mean time.

hope this helps

[demobob]

Thanks Shoes

[Gareth246]

Good morning from Sunny South Africa. I have just purchased my first big pusher aircraft. Its a 120 Super Falcon. It is quite a strange aircraft in that prop choice is quite difficult, due to clearance problems. The main issue is that i am limited to a 14" prop. Which a 90 size motor has no problem swinging. Putting a 120 size motor does not help if i can not swing a bigger prop. The aircraft ways in at 6.7Kg. Does anyone have one of these aircraft. Or have any information on what engine and prop i should use. Being based on a "jet" i would like it to fly like one.

thanks