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Old Feb 07, 2013, 03:09 AM
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308 Posts
hey jack will this motor do for a 24WS
http://rchobbyaddict.com/product_inf...roducts_id=433
im worried about the Voltage: 11.1v (3S) on this motor as my rx is upto 7.4v and battery also says 7.4v

,battery im using is zippy battery-
Capacity: 1300mAh
Voltage: 2S1P / 2 Cell / 7.4v
Discharge: 20C Constant / 25-30C Burst
Weight: 76g (including wire, plug & shrink wrap)
Dimensions: 72x36x13mm
Balance Plug: JST-XH
Discharge plug: XT60
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Old Feb 07, 2013, 07:26 AM
Jack
USA, ME, Ellsworth
Joined May 2008
16,994 Posts
Yes, it is 39 grams so it will handle an input power of about 3 x 39 or 117 Watts. It takes about 30 to 50 Watts per pound to fly a basic trainer type plane so you will have more than enougth power for a typical 24" wing span plane. I would guess is would be around 10 oz. or so that the heaviest. If it gets too heavy, the wing loading gets too high and that makes is harder to fly.

Here is some prop testing data on it:

http://www.headsuprc.com/servlet/the...trunner/Detail

Jack
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Old Feb 08, 2013, 02:48 AM
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hey jack thanks, just checked my electronics total weight is 160grams already with my present motor wich is 29grams, so searching for a lighter motor like u said 24 grams kv 1000-1200 wanted to keep planes auw 250grams , going for d above would give 10grams more,trying hard to find here
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Old Feb 08, 2013, 10:24 AM
Jack
USA, ME, Ellsworth
Joined May 2008
16,994 Posts
I'm just basing the 10 oz. on typical build of planes like the Blu Baby 33. Some of my builds on that plane were up in the 20 to 25 oz. area because I was build for strength and durability when I did those.

And having a motor that is a little larger than needed is OK too. I would rather have too much power and throttle back than to have too little.

Jack
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Old Feb 09, 2013, 12:20 AM
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thanks jack will keep this in mind good info like always from u thanks again
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Old Feb 17, 2013, 02:52 AM
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jack i have built my 24ws plane weight with out electronics is 100grams , my electronics with out motor is 124 grams was suggested this motor and need your suggestion like always as the kv is1450rpm and you know my electronic best http://hobbysea.com/products.php?21&cPath=14
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Old Feb 17, 2013, 06:13 AM
Jack
USA, ME, Ellsworth
Joined May 2008
16,994 Posts
Here is some good test data on that motor:

http://www.flybrushless.com/motor/view/167

It looks like you'll be flying at around 280 grams or 10 oz. or so (I'm adding some weightfor a battery) so that motor should work fine for you.

The test data shows you can easily be at a 1:1 thrust to weight ratio and flying well above the 30-50 Watts per pound recommended minimum.

Jack
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Old Feb 17, 2013, 06:21 AM
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jck i checked my electro weight......
prop-5grm ,
esc- 18grms,
rx- 6.7grms,
2servo-18grms,
battery-76grams , zippy battery-
Capacity: 1300mAh
ttl elect weight 123.7grms with out motor
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Old Feb 17, 2013, 10:01 AM
Jack
USA, ME, Ellsworth
Joined May 2008
16,994 Posts
So you'll be flying about about half the weight I estimated. it won't take much throttle at all, go easy on that on the first flight.

Jack
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Old Feb 17, 2013, 10:41 AM
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hey jack what prop to use for this http://hobbysea.com/products.php?21&cPath=1 and another thing mention for this motor is "" Use with a 10 Amp brushless ESC and small 7.4V lithium batteries in the 400mah - 800mah range."" my esc is 18A and battery 1300mah
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Old Feb 17, 2013, 03:46 PM
Jack
USA, ME, Ellsworth
Joined May 2008
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Quote:
Originally Posted by romanxdsouza View Post
hey jack what prop to use for this http://hobbysea.com/products.php?21&cPath=1 and another thing mention for this motor is "" Use with a 10 Amp brushless ESC and small 7.4V lithium batteries in the 400mah - 800mah range."" my esc is 18A and battery 1300mah
"..Recomended prop: 8040/2S or 7035/3S..."

You can use any capacity on the battery, the only difference between a 800 and 1300 pack is the latter is heavier and will last longer.

Look at the testing data at the link there at flybrushless.com. The test voltages that are 7.4V and below are 2S, the higher voltages are 3S. The number are for batteries under load so you won't see the full voltage.

I would use the prop testing data there at flybrushless.com for choosing and using props, they do not report props that make a motor overheat or that develop excessive RPM.

Jack
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Old Feb 17, 2013, 03:49 PM
Jack
USA, ME, Ellsworth
Joined May 2008
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It looks like you're almost ready to fly. One suggestion I have would be to have the flat or very nearly flat. That would be called zero incidence and the wing and horizontal stabilizer would be parallel to each other. With the front up higher the plane will want to not fly level and may even loop over when power is increased.

Jack
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Old Feb 18, 2013, 05:43 AM
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ready 2 fly jack but confused ibwant to buy a motor PLEASE HELP ME PICK the best from the ones below. considering plane to be 24WS a very very slow flyer , and plane auw 124grams with out motor.im using 18A esc and 1300mah 76grams can change to 800mah 48grams if u suggest,PLEASE HELP

http://hobbysea.com/products.php?21&cPath=14
or
http://rchobbyaddict.com/product_inf...roducts_id=296
or
http://www.brchobbies.co.uk/catalog/...roducts_id=859

THESE ARE THE MOTORS AVAILABLE HERE
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Old Feb 19, 2013, 04:07 AM
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jack , i weighed the entire plane with every thing prop,18A esc,rx,battery 1300mah,..etc except motor the weight is now 190 - 200grams i have still not decided on the motor please advice as i want it to be 24ws and very very slow flyer. PLEASE HAVE A LOOK AT MY PLANE PICS AND U TELL ME WICH MOTOR TO BUY FOR A VERY SLOW FLIGHT I WILL BUY,SHOULD I BUY TURNIGY 2204-14T 19g OutrunnerKv: 1450rpm or FC 28-22 Brushless Outrunner 1200kv 39grams
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