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Old 09-01-2016, 11:41 PM   #11
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Re: What size engine?


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Will be great on fuel.

Bill
Yup, sure will......
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Old 09-02-2016, 12:11 AM   #12
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Re: What size engine?

If you go with the .52, look for ways to lighten the airframe and when you have done that, lighten it up some more. With less power you will not need as much beef and the performance will be so much better!
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Old 09-02-2016, 12:48 AM   #13
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Re: What size engine?

OK, I'll probably still look at the Saito 62 then. The only reason I was questioning the 52 is that there is a very lightly used one available for a decent price at the LHS. But if it's going to be on the lower end of the power spectrum, I'd rather have a little extra oomph.
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Old 09-02-2016, 07:30 AM   #14
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Re: What size engine?

A while back I built a Great Planes Slow Poke which is intended to be .40 two stroke powered. I tossed out all the light ply and the solid hard balsa slabs and substituted good quality balsa shaving a good pound off the airframe. I powered it with an OS .40FS and 11.5 x 5 Bolly, it takes off in 30 feet, climbs out at a 45 deg angle and floats in like a feather for landings.

No more beef up and brute power for me!
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Old 09-02-2016, 08:34 AM   #15
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Re: What size engine?

The OS FS .52 would probably work fine for the performance that you are looking for but just won't be a rocket. If you can shave a few ounces off here and there like Merv suggested then your overall flight characteristics would improve slightly.

For comparison, I am flying an older Hanger 9 Mustang PTS with an old OS .61 4 stroke and it does just fine, so the Kommander with the .52 should be fine.
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Old 09-02-2016, 06:37 PM   #16
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Re: What size engine?

Two identical planes with the same power, the lighter one will fly faster, climb out steeper and land slower. Worth the effort in my book!
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Old 09-02-2016, 10:46 PM   #17
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Re: What size engine?

I think you will find regardless of the size of engine a 4 cycle will have greater control , 4 cycles produce greater prop wash and a ton of torque so even at low speed you will have good control. with a 2 cycle you need speed to maintain control. A under powered 2 stroke plane is almost uncontrollable .A under powered 4 cycle plane will be slow but much more controllable. after flying 4 cycles I don't even like to fly 2 cycles anymore. a good rule of thumb for 4 cycle engine size is . .30 for a 3 lb plane a .40 for a 4 lb plane .60 on a 6lb plane .90 on a 9 lb plane, and so on . now this is just a guideline I had a os91 on a 7.5 lb goldberg chipmunk but a 70 would have done fine . cheers Roger
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Old 09-03-2016, 11:19 AM   #18
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Re: What size engine?

LOL, all very good points from everyone, thanks! It has me bouncing my decision back and forth between a 52-62 4 stroke or an OS 46 2 stroke.
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Old 09-03-2016, 02:17 PM   #19
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Re: What size engine?

OK... I said screw it... I bought the OS FS52. I figure I want to up the performance later, or if it's not enough, I'll cram a bigger engine in. I just couldn't refuse the price right now.
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Old 09-04-2016, 10:03 PM   #20
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Re: What size engine? (Started Komander build... finally)

Finally started my Komander build. Been sitting on some partial kits for at least 2, maybe 3 years now. Finally have all the pieces to build two of them with the exception that I have only 1 canopy. I might take a stab at building a vacuum forming box and make a duplicate.
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Two wrongs don't make a right, but two Wrights will make an airplane.

My Heli: Futaba 18MZ 2x(JR GSR260Z Sports FBL, Zenoah G26H, Futaba CGY750 Gyro, Futaba BLS-351 cyclic, BLS-251 tail, Futaba BLS-451 Throttle. Gryphon voltage regulator).
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