Just completed my Sig Smith Miniplane (Skyloft covered and paint finish as N391Y, don't have photos yet).
Installed my old OS FS 61 and am not quite sure which prop to start testing it with.
Used to fly this engine on a 60" bipe with a 13-6 and got good power at low speed, but the 13-6 looks rather "big" on the Smith.
OS allows to use a 12-6 too on this engine though at the lower limit.

If anyone has this plane/engine combo, I'd appreciate your advice.

Also, though am an experienced flier, this being a rather small and high powered bipe, I put a GWS rate gyro on the rudder (saw a friend use it on his models and was impressed). Smart moove? redundant? anyone tried it?

Thanks

Erez

Don't have the plane; but a friend did back in the 80s. He flew his with an O.S. 40 and it had plenty of power. I'm not saying your over powering yours, only that he had plenty. He flew the heck out of his and always said flying it was akin to putting on an old pair of shoes; "comfortable".

I always ran 11X7s on my OS .60 "Blackhead" This was a good all around prop used on a sport engine.

I rebuilt a Sig Smith in the 90's. Originally it had a FOX 45 in the nose and it really screamed. I put a K&B 45 in it and it flew very nice and not underpowered at all. Since then I have substituted an XL52RFS four stroke. You can see my plane at my profile/models.
If you put a .60 in this plane I would really recommend a good check of the control surfaces, since it will be easy to get this model to flutter. It's gonna be a bullet.

Good Luck!

Charlie

I flew mine (back in the early 90's) with a OS 48 4-stroke. It was a joy to fly and had plenty of power. I think with a 60 up front throttle mangement will be a must.

Guys...the OS FS 61 I am mentioning is an old FOUR STROKE engine.
Wouldn't dream of a 60 two stroke without a go-ahead from NASA

Hi EF,
I also had a Smith Mini Plane in the 90's and I flew it until the air frame started to come apart. The model weighed 7lbs. and had unlimited vertical performance with an ENYA 45 2S. This plane is a blast to fly and a joy to land. It will do almost anything you can think of in the air. I would recommend you use a large diameter prop and a low pitch that suits your motor. You want lots of pull for aerobatics, not speed. A big, low pitch prop helps to set up landings that just sink right in on a steady glide slope while using a low power setting. I wish I still had mine, it was such a perfect size to take to the field, already assembled and ready to go. Enjoy!! Rick