My next project is a 1/3 Sopwith pup.
The manufacturers specs are 28-34 lbs, 108 WS, 45-70 cc gas engine. 2.1-1.27 glow engine. What would be a motor on the market that can power something this size?
the king has an 80cc motor:
http://www.hobbyking.com/hobbyking/store/__25410__Turnigy_RotoMax_80cc_Size_Brushless_Outrunner_Motor.html (http://www.hobbyking.com/hobbyking/store/__25410__Turnigy_RotoMax_80cc_Size_Brushless_Outrunner_Motor.html)
A small child, pedaling?
Greg,
Just take a motor from one of your VW's you have on your property. Should be powerful enough. ;D
If you want to go electric, may I suggest the lawnmower bolted on vertically with a very long cord. 8)
Holy crap- 6600 watts!!! My entire fleet of 40 airplanes don't even total that!!
Frank
Is the runway large enough for that size of plane?
At 108" I would just land it at buttonville!
It can be done.
This one will work for sure "Max. Power at Sea Level (Lb.): 53,200-74,100 lbs." .... More than enough.
I would use two of those.
The e-flite Power 160 might do it.
http://www.e-fliterc.com/Products/Default.aspx?ProdID=EFLM4160A (http://www.e-fliterc.com/Products/Default.aspx?ProdID=EFLM4160A)
Jack.
Quote from: Papa on May 21, 2013, 09:59:18 PM
The e-flite Power 160 might do it.
http://www.e-fliterc.com/Products/Default.aspx?ProdID=EFLM4160A (http://www.e-fliterc.com/Products/Default.aspx?ProdID=EFLM4160A)
Jack.
Are you sure. The plane is 10 lbs over the recommendation. Would like to have at least 100 watts per pound. I have a similar motor in my 1/4 scales that make me run at 1/4 throttle most of the flight. So maybe that might be ok.
Greg, one of the things that I'm guessing that will be a bit of a challenge here is also the amount of weight that you'll probably need up front to balance. With that being said, the largest motor that you can afford would be best. ;D Its been my experience when converting gas/nitro planes that the plane will probably be at least 15% over their stated weight when converted. ::) Therefore you're looking at about 40lbs give or take.
This calls for least 4000watts based on your stated preference. ;D So, I'd second Greg H's suggestion (the HK rotomax at 68ozs) or you can go with a slightly more affordable option with the Suppo A7035/9, (called "Cheetah" here (http://www.bphobbies.com/view.asp?id=V450327&pid=B3675242)) which has the power you'll need albeit lighter by about 10 ounces. (at 58ozs still no lightweight though!)
I really believe that nose weight will be your biggest challenge here hence my suggestion. Something to consider. Just my .02 cents. ;)
Colin
Ok Collin, thanks for the information. Due to the large Cowl on a Sopwith Pup, I was going to hammer everything in the nose.
My plan was to use 10-12S. Running 2X5S 4000 in Par =8000 mah having two sets, so 4X5S parallel, then putting the 5S-8000 in series making a 10S, 8000. With 4 large 5S4000 packs in the nose, this will help. Worse case I can add another 4 packs if I need more weight. I have more than enough room with a power 160 or a rotomax in the nose. I am hoping to build this one light. Maybe 30 lbs with scale stuff added.