abufletcher ,

You're making a lot of since. This is why I ask questions and follow advice.

I took a look at the Saito engines. The 150 or the 180 may also be an attractive choice. Ever see them at work?

Did I mention the Ag Cat's wings are metal covered? I'll use balsa, but I am considering covering the wings and airframe with metal. I have a lot of experience working with metal.

[Quote.]

Based on Bipes I've had in the past, it would be pretty hard to keep at 15lbs with an 80" wingspan (but not impossible). That being said, I would consider a saito 150 or maybe a 180 which would give a fair amount of reserve. A larger engine would give you the torque you would need to swing three blade props. A buddy used a 150 to swing a 16x8 three blade grupner prop that looked real nice. I used a saito 120 on a 14lb Phaeton 90 with 4 ailerons. 15 lbs is about it for a reasonable limit for a 120 to have adequate power reserve, (with a high drag, lots of wing area design). It was by no means very fast as speed goes, but with 4 ailerons it would do the most beautiful slow speed aerobatics you ever saw. Loved it. Just my opinion.
Edwin.]

A good opinion it is! I mentioned those engine choices before I read your reply.

Can you tell me more of your buddie's Grupner prop? Does it resemble that of a turbine prop? I was considering a carbon fiber prop. I find NO measurements of any Saito engine. Would your buddy give them up to the 150? Be nice to have them, especially in locating the firewall.

This Ag Cat, being scale, with both wings sheeted, add "extras" for detailing not to forget glassing and paint, and it wouldn't take much to exceed 15 lbs, Especially if a fabric covered Phaeton came in at 15 lbs. Great model BTW. I once did Christen Eagle graphics for a customer with a Phaeton. I may have a photo someplace?

Here's a photo of Engine possibilities. I'll get the photo of the 150.

I do hope suggestions and conversations keep coming.

Thanks,

Charles