Society of Robots - Robot Forum

Mechanics and Construction => Mechanics and Construction => Topic started by: random robots on July 06, 2010, 12:32:42 PM

Title: help with finding motor + prop combo
Post by: random robots on July 06, 2010, 12:32:42 PM
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
Title: Re: help with finding motor + prop combo
Post by: Selenaut-14 on July 06, 2010, 01:11:22 PM
Making a plane, I presume?
Title: Re: help with finding motor + prop combo
Post by: random robots on July 06, 2010, 01:15:34 PM
yup, a uav. but i need special props and motors that can carry a foam glider and breadboard. got any links?
Title: Re: help with finding motor + prop combo
Post by: Selenaut-14 on July 06, 2010, 01:53:05 PM
http://www.hobbycity.com/hobbycity/store/uh_listCategoriesAndProducts.asp?idCategory=265 (http://www.hobbycity.com/hobbycity/store/uh_listCategoriesAndProducts.asp?idCategory=265)
http://www.kidwind.org/xcart/home.php?cat=79 (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.
Title: Re: help with finding motor + prop combo
Post by: random robots on July 06, 2010, 02:23:27 PM
thanks. but i want to figure out lift specs to. any places where i can get that?
Title: Re: help with finding motor + prop combo
Post by: Selenaut-14 on July 06, 2010, 02:32:18 PM
Not so sure... I still have the set if you want me to try it.
Title: Re: help with finding motor + prop combo
Post by: random robots on July 06, 2010, 02:38:27 PM
I guess you could... but remember if it cant hold 3/4 of a pound up, its gone. unusable.
Title: Re: help with finding motor + prop combo
Post by: Selenaut-14 on July 06, 2010, 03:28:16 PM
It's a no-go. Works good as a fan though.
Title: Re: help with finding motor + prop combo
Post by: Razor Concepts on July 06, 2010, 04:16:51 PM
The reviews should have some spes on grams of thrust produced.
Title: Re: help with finding motor + prop combo
Post by: random robots on July 06, 2010, 06:51:46 PM
not on the ones i saw
Title: Re: help with finding motor + prop combo
Post by: Razor Concepts on July 06, 2010, 07:12:10 PM
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.
Title: Re: help with finding motor + prop combo
Post by: random robots on July 07, 2010, 05:55:30 AM
ok, ill try that
Title: Re: help with finding motor + prop combo
Post by: random robots on July 07, 2010, 06:10:38 AM
i'm back without any info. any other suggestions?
Title: Re: help with finding motor + prop combo
Post by: random robots on July 07, 2010, 02:05:04 PM
new question: should I get a brushed or brushless motor?
Title: Re: help with finding motor + prop combo
Post by: Selenaut-14 on July 07, 2010, 02:13:28 PM
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?
Title: Re: help with finding motor + prop combo
Post by: random robots on July 07, 2010, 02:17:55 PM
what do you mean by efficiency? lower required voltage/current, or better rpm?
Title: Re: help with finding motor + prop combo
Post by: random robots on July 07, 2010, 02:49:10 PM
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 (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 (http://www.hobbycity.com/hobbycity/store/uh_viewItem.asp?idProduct=8007).
Title: Re: help with finding motor + prop combo
Post by: dunk on July 07, 2010, 04:35:18 PM
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 (http://www.rcgroups.com/forums/showthread.php?t=966298)
tells you about the awesome http://www.flybrushless.com/ (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.