Hello... This question is for all of you weedwacker converts out there... I am a new convert myself and I am building a Cessna Agwagon from scratch. It will have a ws of 84". I could probably use a 120-size glow, but I really want to put a gasser on it. Unfortunately, I don't know which engine to use. I have a Homelite 25cc lying on the shelf collecting dust. Are there any rules of thumb to go by when choosing engine / prop combos for aircraft size??? Thanks in advance for the info...

DF

The Homelite 25 will be fine

It will pull a 18 X 8 if you put a "28" size carb on it and open up the exhaust. About 7000 rpm

Otherwise you will have to run a 16 X 10 still about 7000 with the stock carb

Keep your eyes open for the 30cc Homelite.
It's the same engine different bore lighter and more power.

Just so you know, you can quickly tell if a Homelite 25/30 series engine is a 30 by looking in the exhaust port. The 25cc engine has a bridge in the exhaust port, and the 30cc does not.

The Homey 30's were getting hard to find, but the newer Ryobi weedeaters I found have Homelite 30cc engines in them. The 30's work quite well.

AV8TOR

Guys, thank you all for the info. This is definitely what I needed to know. Once again, thanks...

DF

Im about halfway through converting a stihl 25cc.Check out the stihl threads.I have a stihl 28cc thats putting out 7400-7600-rpms with an apc 17x8,and its a used engine.

That's pretty good power for an engine that size

Number 28 in carb throat,Ken Lambert muffler,ch ignition timed at 28 BTDC.No advance.
2 rings on piston,everythings stock.Prop came off my OS 160 before i sold it.
Tri mount on back,Rail mount on botom.I think it came off of a FS-46.[Stihl].