I have got a great planes rimfire 35-30-950 brushless motor looking for a home. I am new to electrics and i was just wondering what size aircraft am i limited to, I had it in the great planes reactor 3d ep and it would pull the 27oz plane out of a hover, so for example if i was going to a scale flying type airplane and not 3d how big of a plane can i put this motor in? Say for example would it fly a 64 oz tiger month?

I'm not sure how many watts that motor is, but figure for scale flying something like 100w per lb, so if that motor is about 400w, or about 36A on a 3s, or 27A on a 4s then it should preform nicely =)

figure about 50w per lb for a trainer, 100 for scale or mild 3d, and 150 or more for high performance 3d/ hovering.

from towers site

SPECS: Motor Diameter: 1.38" (35mm)
Motor Length: 1.18" (30mm)
Shaft Diameter: .16" (4mm)
Shaft Length: .65" (16.5mm)
kV Rating: 950 rpm/V
Weight: 2.47oz (71g)
Input Voltage: 7.4-14.8V
Max. Constant Current: 20A
Max Surge Current: 28A
Max Constant Watts: 296W
No Load Current: .8A
Suggested Prop Sizes: 10x5E - 12x6E

does this mean that its roughly a 300W motor so it should handle up so a 3 pound scale flying type airplane?

yeah, it all depends on how much power you want it to have, 300 watts for a 4lb bird = 75w per lb, and that is getting a bit on the low side, but it might work if you just want to put around and not do anything too terrific. Is the 4lb the AUW with all the servo's batteries and other stuff?

you can also try this
http://www.commonsenserc.com/page.ph...tor-wizard.php
http://www.commonsenserc.com/page.ph...ent_chart.html


also here is a better list for you as far as w/lb http://www.horizonhobby.com/Articles...563&tag=aq_art

We can determine the power requirements for a given model based on these Input Watts Per Pound Guidelines (using the RTF weight of the model, including battery pack):

• 50–70 watts per pound: Minimum level of power for decent performance, good for lightly loaded slow flyer and park flyer models

• 70–90 watts per pound: Trainer and slow flying scale models

• 90–110 watts per pound: Sport aerobatic and fast flying scale models

• 110–130 watts per pound: Advanced aerobatic and high speed models

• 130–150 watts per pound; Lightly loaded 3D models and ducted fans

• 150–200+ watts per pound: Unlimited performance aerobatic and 3D models

i had this plane in mind http://www.hobby-lobby.com/tigermoth.htm

this is the motor they recommend
http://www3.towerhobbies.com/cgi-bin...1&I=LXPPX3&P=3

which runs max 42A, cont 20-30A in the best power band, and the motor you are looking at looks more like 20A cont 28A max, if you get a 4s lipo then you can get your 75w/lb, but if you run a 3s lipo you're only looking at 55.5w/lb

so I would say, maybe if you run a 4s lipo you might maybe be able to get by with it. HL has good support though, call them up and see what they have to say as far as recommendations and see if they think 75w/lb on a 4s lipo will get that plane around =)

the motor they recommend with that one is going to be about 84w/lb (3s) to 111w/lb (4s) at the high end of the max efficiency. If you wanted to fly slow you might be able to get away with less though