Brushless setup
06-30-2011, 01:38 PM
#5
RE: Brushless setup
I have a motorized Gentle Lady that weighs 36 oz RTF, with a 2200 3S pack and a Rimfire 400 motor. I'm using an APC 10x6 folder on it. It's peppy on a full throttle climb, but not a rocket. Mine weighs 2.2 pounds, yours at present weighs 3.1 pounds. That system would probably work just fine given that you aren't looking for a hot rod. If you're careful and get everything as far forward as you can, you shouldn't have to add any weight for balancing purposes. I set mine on a balance stand after I removed the original receiver pack and the lead in the nose, and put my components on top of the fuse and moved them around until it balanced.
If you go much smaller than this, balancing could get tough. You'll need the weight of the motor and battery to replace the lead that would normally be in the nose.
If you go much smaller than this, balancing could get tough. You'll need the weight of the motor and battery to replace the lead that would normally be in the nose.
07-01-2011, 08:34 PM
#6
Join Date: Oct 2002
Location: Chilliwack, BC, CANADA
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RE: Brushless setup
A strong but not rocket like climb can be had with a motor that uses between 60 and 70 watts per lb of final model weight. With the Swan Goose you'll want to find out what portion is nose weigh which will be replaced with motor and battery and what portion of the added motor and battery will be additional. With that number in mind you can calculate how may watts total you want the motor to use for power. Then go motor shopping at your favourite supplier.
There's just so many motors and suppliers these days that you can get anything you want at prices that vary widely.
I could be wrong but it looks to me like this model has an old brushed motor in it and that the weight is intended to include an old style Nicad or NiMh pack which weighs a LOT more than the current equipment you can put into it. It's quite likely that you would be able to reduce the weight down to well under 50 oz.
Do you already have the model? Do you have a scale that you can use to weigh the model with and without the present motor and battery in the model?
There's just so many motors and suppliers these days that you can get anything you want at prices that vary widely.
I could be wrong but it looks to me like this model has an old brushed motor in it and that the weight is intended to include an old style Nicad or NiMh pack which weighs a LOT more than the current equipment you can put into it. It's quite likely that you would be able to reduce the weight down to well under 50 oz.
Do you already have the model? Do you have a scale that you can use to weigh the model with and without the present motor and battery in the model?
07-03-2011, 01:41 PM
#7
RE: Brushless setup
For a climb of about 45 degrees go for 60 to 70 watts/pound on a 1100 to 1300 Kv motor.
50 ounces ( including battery and motor) is about 3 pounds. 200 to 250 watts should do it.
Everyone has their particular brands. I have done very well with the Rimfire motors.
I have this in a 2M with a 10X6 prop, 3S lipo which puts out about 280 watts. Works real well on a 42 ounce 2M all up weight. Yours is a bit heavier. A 2100 15 to 20 C pack should work just fine and give you a bunch of good climbs. Just make sure you have room in the nose as the outside of the motor spins and needs some clearence if you put it inside the fuselage.
http://www3.towerhobbies.com/cgi-bin...?&I=LXLWU0&P=7
I also use the same motor with an 11X8 prop and a 2S 2100 mah battery about 200 watts on the same plane.
Remember that the motor and battery will replace the lead you normally put in the nose, so if you have 6 oz of lead in the nose that weight will be taken up by the motor and battery. If you get it just right the plane will come up pretty close to the pure glider weight.
