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Good W/Lb area for 3d flying...

Old 12-12-2008, 02:39 AM
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GreenAce92
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Default Good W/Lb area for 3d flying...

Well im looking for good combos from grayson hobby those that are motor and esc paired togethere like this one below:

http://www.graysonhobby.com/catalog/...roducts_id=619

how do i tell how much like thrust it makes?

Last edited by GreenAce92; 12-12-2008 at 10:52 PM.
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Old 12-12-2008, 02:27 PM
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EDFrules
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Looks like it's for 7-17oz planes. You might assume a 7-10oz plane could 3D with it. Looks like you'll get around 84watts or so according to specs on a 9 x 5/3s. I would try a GWS 9 x 5 DD prop(butter knife blade). Gives you a little better throttle response than a slo-fly prop.
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Old 12-12-2008, 10:51 PM
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Wait let me retittle this thread lol to "how many watts per/lb good for 3D flying"
i know yours would prolly be 250lol

so heres what im thinking, if i have 100wats of power, if my plane is under 10oz or ahh crap im getting that that is around 63w/lb? (did 10/16oz's and then multiplied by 100watts) so maybe if i had 150... dang it...

hmmm
200 watts gives me 125w/lb hows that?

not even sure if how i found it is right
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Old 12-12-2008, 11:29 PM
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EDFrules
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We have to use some quesswork as all the pertinent figures are not available. If your plane weighs 10oz(.625lbs) and you're getting 100watts then 100watts div. by .625lbs=160watts/lb. 150watts/lb is considered to be marginal 3D power. I prefer around 200watts/lb. This is not nessicarily because I need all that power, I only have to use 3/4 throttle at most and this puts a lot less stress on the power system than a lower power rating. My packs/motor/ESC usually come down warm. Down here in the sunshine state I find this esecially critical in the warmer months as the system doesn't get nearly as hot as with a lesser powered system. Don't know if that makes sense or not but it works for me. Sort of like you can pull a boat behind your truck with a 6 cylinder engine but it has to work hard to do it but if you put an 8 cylinder engine under the hood it will pull no problem without putting your foot to the floor If you've seen our vids you'll notice the planes have plenty of power yet the power system is not overheated at all. Find that's the key to making the power components last. Hope that helps Of course the watts/lb is a general rule of thumb. Thrust/RPM and amp draw are also important as well as being able to spin the correct sized prop. High KV motors that swing small props are generally not good for 3D. Low pitch and larger diameter are what we look for in a good 3D prop.

Jason
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Old 12-12-2008, 11:30 PM
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TDisaster
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Originally Posted by GreenAce92 View Post
Wait let me retittle this thread lol to "how many watts per/lb good for 3D flying"
i know yours would prolly be 250lol

so heres what im thinking, if i have 100wats of power, if my plane is under 10oz or ahh crap im getting that that is around 63w/lb? (did 10/16oz's and then multiplied by 100watts) so maybe if i had 150... dang it...

hmmm
200 watts gives me 125w/lb hows that?

not even sure if how i found it is right
Um Jake that would actually be around 160 w/lb... I didn't do the math so I know I'm off, but your wayy off on that one. If you have 100watts, and have a plane that weights 10oz (under one pound) how do you get lower than 100 watts/lb?
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Old 12-12-2008, 11:31 PM
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Lol ya beat me EDF .
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Old 12-13-2008, 12:04 AM
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Whoops crap... well im not too good on problems solving yet... lol
Thanks for the info EDF and 3D
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Old 01-31-2009, 03:01 PM
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If you are going to do any hovering look for something in the 200W/LB range. If you get in trouble punch out is lazy with anything less than that.
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