Recomendations for a Byrons P-51

[sscherin]

Hey all.. I'm somewhat new to electrics other than my daughters Easy-Star so please bear with me..

I have a Byrons P-51 kit (early one piece wing) that I"m going to get started on soon and a Lanier 81 Cap 323 kit..

What I would like for the Byrons P-51 is to be able to use the Byrons 24" 4 blade prop.. The Byro-drive units turned this prop about 3,500 rpm with 35-50cc gas engines..

So I guess the question is is there a motor that would turn this prop as a direct drive? or should I look at some kind of gear or belt drive reduction?

I saw in another thread that a Byrons Corsair was being flown with an AXI 5345/16 and 12s8000mah pack.. If I went with a reduction drive for the byrons would this motor/battery also work well in the Lanier 81" Cap 232?

If I were to go gas on these I'd be running a DL-50 but I'd really like to explore the electric option first.

[Lynxman]

I would make a belt reduction drive if it was me. A motor with a kv (rpm per volt) low enough to spin that prop directly will either be very large (and heavy) or very inefficient because of the thin wire required. Is the Byron P-51 1/5 scale?

Keep in mind that it's very hard to find Byron prop blades these days and you will need to replace them if (if you're like me, when) the blades strike the ground. :)

[Goinav8n]

A 2215 2y Neu motor might be a good motor for your application. Im not sure what the gear reduction is on the Byron as the motor might be too much for it

Jeff

[sscherin]

The plane has a span of 85" (1/5 scale) and typically comes in at 25-27lbs with a gas engine and byro-drive.

A Stock byro drive is a 2.5-1 unit.. I'll be making my own so that can be adjusted.

[Lynxman]

A Hacker A60-18L on 12S lipos with a reduction ratio of between 1.6/1 to 1.7/1 might work. Alternatively with 10S and 1.3/1 to1.4/1. The budget option would be a motor from hobbycity.com but I can't guarantee the quality.

I suggest you find examples of similar planes (Hangar 9 1/5 Mustang, Topflite 1/5 Mustang) and see what power system components they have used. If they have an RPM reading under load and performance data you can use that RPM reading and the same motor/battery combo to calculate an approximate gear ratio and go from there. You will probably have to test different ratios before you find the sweet spot, but as long as the motor is powerful enough, it should be a piece of cake to gear it to spin the prop shaft at 3500 or a little more. I usually buy some larger and smaller pulleys than I need so that I can experiment.

[N99JH]

I would run the numbers on Motocalc for a 4 blades 24" prop first. I am finishing a belt reduction and will be happy to share the design with you if you are interested. The entire reduction + a Hacker A60 18L will cost you less than one Neu motor.

[dag214]

When I was loosing my mind looking for a set-up for my B-36 Hacker saved me by looking at what had worked on other peoples set-ups. Call Mike at Hacker and he will give you good solid info. I have found that there is a lot of guys on here that have built their own belt drives and with the lower KVA motors you will find something that will work. But if you need help with the motor info call Hacker.

Good luck,
DAG