Sig Extra 300
 

Wondering what engines would be best suited for this bird.....Looking for examples in the following categories..

Gas Engine

4 stroke

2 stroke


Any recommendations for good 3d performance in all 3 categories would be greatly appreciated.

Thanks!
deck

Sig Extra 300
 

Gas - Brison 2.4 (I am currently using in my lanier 1/4 extra 300s)

4c - saito 1.8 (provides good power, but loves fuel and shakes a lot)

2c - Moki 1.8 or 2.1 (tons of power - the only reason I chose gas for mine is because of operating costs and comparable weight to the moki's. With gas you will gain fuel efficiency affording a smaller tank to compensate for gas's ignition system)

Hope this helps!

Sig Extra 300
 

Thanks!!! Any input on an OS 1.60 compared to a Moki 1.8???

Sig Extra 300
 

None first hand.

If your airframe is like mine, it's tail heavy tendency will be well compensated by a heavier engine. When balancing a nose heavy plane, getting the weight as far forward is tough (adding balancing weight further from the cg increases the moment, decreasing the amount of weight required). To me, weight and wing loading is everything. I would buy the airframe, completely assemble everything (radio, pushrods, etc.), then try to calculate the amount of weight required in the engine compartment to achieve balance. I've used broken paver peices placed in a sock for this. Install as much engine as you can with no additional weight for balance, and you should be very happy.

Good Luck!

Sig Extra 300
 

I had one with a OS 160 in it. It was a great little flier. The OS pulled it very well. If you are into IMAC type of flying, this is a perfect plane. I fly IMAC and 3D. The plane did not 3d well but was a very smooth flier. Mine met its end in a low flat spin. I used a Mejzlik 18X6 prop. It was a perfect combination for the plane.