help with finding motor + prop combo

[random robots]

specs-

has to be able to carry 3/4 of a pound MINIMUM

combo has to be less than $20 ($10 is even better)

please post links if possible

[Selenaut-14]

Making a plane, I presume?

[random robots]

yup, a uav. but i need special props and motors that can carry a foam glider and breadboard. got any links?

[Selenaut-14]

http://www.hobbycity.com/hobbycity/store/uh_listCategoriesAndProducts.asp?idCategory=265
http://www.kidwind.org/xcart/home.php?cat=79
for the first, you may find something there. For the second, I used it a while back. You'll need the generators and the power output kit (the black fan incthere is what you need.) the generators are actually just motors. Hook up a 9V and I think you might be good to go. However, the 9V might not be enough.

[random robots]

thanks. but i want to figure out lift specs to. any places where i can get that?

[Selenaut-14]

Not so sure... I still have the set if you want me to try it.

[random robots]

I guess you could... but remember if it cant hold 3/4 of a pound up, its gone. unusable.

[Selenaut-14]

It's a no-go. Works good as a fan though.

[Razor Concepts]

The reviews should have some spes on grams of thrust produced.

[random robots]

not on the ones i saw

[Razor Concepts]

I meant on the motor pages, usually from the motor page you can read the reviews and find out which ESC and which prop they used to get that many grams of thrust.

[random robots]

ok, ill try that

[random robots]

i'm back without any info. any other suggestions?

[random robots]

new question: should I get a brushed or brushless motor?

[Selenaut-14]

It may cost a bit more, but I researched and a brushless motor is way better than brushed... It's just less durable. Your call. Higher efficiency, or higher durability?

[random robots]

what do you mean by efficiency? lower required voltage/current, or better rpm?

[random robots]

i found a motor i think... http://www.hobbycity.com/hobbycity/store/uh_viewItem.asp?idProduct=5433&Product_Name=AX_1806C_2100kv_Brushless_Micro_Motor. would this work? 337grams o' thrust. And would this prop work http://www.hobbycity.com/hobbycity/store/uh_viewItem.asp?idProduct=8007.

[dunk]

have you considered asking this in a Radio Control forum rather than a Robotics forum?

the first sticky on RCgroups.com "Aircraft - Electric - General" section http://www.rcgroups.com/forums/showthread.php?t=966298
tells you about the awesome http://www.flybrushless.com/

FlyBrushless.com will tell you what force you can expect with a variety of motor/prop combos.

how much force you need to lift 3/4lb in a fixed wing aircraft will depend entirely on what airframe you are using.


dunk.