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Old Jan 18, 2013, 11:08 AM
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United States, TX, Fort Worth
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Question
UMX P51 motor and gearbox thrust

does anyone knows whats the thrust(in grams) for the UMX P51 8.5mm motor and gearbox?...thanks
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Old Jan 18, 2013, 12:23 PM
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Southlake, TX
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This is very Prop and Battery dependent, but figure somewhere between 45g and 30g.

Good batteries, 5043 are towards the igher end, Cheap batteries 3 blade prop on the lower end.

15 seconds into any battery is going to have more thrust than 5 minutes in, too.
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Old Jan 18, 2013, 01:25 PM
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United States, TX, Fort Worth
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Quote:
Originally Posted by UNGN View Post
This is very Prop and Battery dependent, but figure somewhere between 45g and 30g.

Good batteries, 5043 are towards the igher end, Cheap batteries 3 blade prop on the lower end.

15 seconds into any battery is going to have more thrust than 5 minutes in, too.
thanks!!!!......
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Old Jan 18, 2013, 01:50 PM
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Hi again,i have another question;I have a dual motor airframe that weighs at 60.4g with nothing on it.Im guessing about 20-25g more weight of components to power it.Do you think I can get away with 2 P51 motors and gearboxes would be enough to lift about 85grams?.....I think I should go over but im not expert ......lmk if I can consult this build with you.Thanks,....Al
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Old Jan 18, 2013, 03:50 PM
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I'm guessing that there would be no problem if the wing area was 85 sq-in or more.
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Old Jan 19, 2013, 12:06 PM
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Quote:
Originally Posted by alset View Post
I'm guessing that there would be no problem if the wing area was 85 sq-in or more.
Is there a formula for calculating thrust needed by measuring wing area?
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Old Jan 19, 2013, 02:42 PM
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Originally Posted by karfrik View Post
Is there a formula for calculating thrust needed by measuring wing area?
No, its more weight to wing area that is important.
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Old Jan 21, 2013, 12:33 PM
JT2
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I have a UMX P51 8.5mm motor and gearbox that I would like to put into a UM scratchbuilt indoor slow flyer. Anyone have recommendations on a design that uses this motor?
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Old Jan 21, 2013, 07:41 PM
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United States, TX, Fort Worth
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Quote:
Originally Posted by alset View Post
I'm guessing that there would be no problem if the wing area was 85 sq-in or more.
Ok,..measured the wings.Its a Wright Bros Flyer so its considered a canard.Does I need to also take in consideration both the main wings or just one?.Im guessing both right?
If so each main wing have a 79sq. inch area take or leave some,so 2x that is 158sq.in.
Both elevators have around 36sq.inch each so 2x that is 72sq.in take or leave some.
As I mentioned above just the airframe is 60.4oz.So guys please lmk if im on the right path.....thanks again
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Old Jan 21, 2013, 07:48 PM
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Here`s some actual model pictures,but this one is heavily modified....
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