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Engine basics => Engine set up tips => Topic started by: Peter Walker on March 05, 2016, 01:21:12 PM
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Hi Guys
I really need some advice please. I am busy building a sig Banshee and have a choice of two motors to use. The first being an old Fox35 and the other being a brand new OS Max 25LA. I have been told that the OS is stronger than the Fox because of the difference in technology. However, I have no idea how much truth there is in that. Can someone please assist me with some advice?
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The LA. It's Schnuerle ported, and generates much more power for it's size. It ought to be good for a really light Banshee. Not knowing how light you build, I'd recommend a 46LA, but I'm not sure how easy they are to find in Darkest Africa.
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I'll second what Tim says. A banshee with an LA engine is the first plane i learned the complete pattern with. Great combo
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Thanks guys, I have tried to build it as light as possible.
C/L motors are hard to come by here Tim. Sadly there are not many of us in Darkest Africa that still build and fly them. I do however have a OS 40LA R/C motor I could use as well. Maybe I should use that?
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The OS40LA that's in my nobler right now started out in my banshee during testing, and ended up in a topflite tutor 2. The tutor is big, so the extra power was fine. The nobler that it's in now is very light, so i am taming it down now. I have no doubt it will be great. It's more than enough power, so a smaller venturi, or restricting it down with nylon netting as Tim has instructed may be just the ticket for your project also.
The banshee has no problem carrying the weight. Mine currently flys with an os40 four stroke
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I'm not sure what the .25LA weights, but to hang a .40 or .46 on there, you will come out nose heavy.
I have the OS.40FP on my banshee, and I was told to cut off 1.5" from the nose, which I did. And the CG came out just about right.
Alternately, you could-
Extend the fuselage aft of the wing,
Move the wing forward in the fuse,
Make a larger horizontal, which will weigh more.
If I was doing this again, I think I would opt for a wing shift forward, and make a slightly larger built up tail. It would be kind of cool to have a 30-34 oz Banshee.
I believe mine weighs 38 with not much attention in building, covered in MonoCote.
Good luck!
R,
Chris
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Thanks a lot Chris, I have already moved the wings forward about an inch and a half. At this stage the plane is all together, so a larger tail is out. I am very willing to take a saw to the nose, but am just concerned about the engine barers. Can they stay as they are or will they have to move back as well?
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If you've already moved the wings forward then you should probably just proceed as you are -- particularly if you end up with the 25.
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Thanks Tim
I would really like to use the 25, i only hope it will be enough.
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It's definitely enough. I've tried 25 powered twisters and banshees. Also, my friend Dennis had a 25la powered nobler that's awesome! You won't be disappointed!
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Thanks Dane
That's it then, my weapon of choice will be the 25LA. y1
I must really say thank you to all on here for the valuable advice. I really want this to turn out well, and thanks to all of you I am sure it will.
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If you've already moved the wings forward then you should probably just proceed as you are -- particularly if you end up with the 25.
Exactly! It's either or, not both on the wing move/nose trim.
I suppose you could do a smaller amount of each, but I did what I was told and just cut back the nose.
You're fine with the wing shift Peter. Finish it up and fly on.
R,
Chris