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Old Jun 25, 2010, 03:57 PM
renatoa is online now
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True, a glider... but what parameters ? what motor ?
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Old Jun 25, 2010, 04:05 PM
Gringostr is offline
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Trolls more than he flys.
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are you looking for a high end motor? or a cheap motor? outrunner or inrunner?
Old Jun 25, 2010, 04:15 PM
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average outrunner.
I found at HK a 620kv 50-12 that fit this prop, but doesn't fit in webocalc, that's why I am puzzled.
Old Jun 25, 2010, 04:44 PM
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Trolls more than he flys.
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it doesnt have to fit webocalc. woc wont be perfect all the time.
Old Jun 25, 2010, 04:47 PM
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Quote:
Originally Posted by RENATOA View Post
average outrunner.
I found at HK a 620kv 50-12 that fit this prop, but doesn't fit in webocalc, that's why I am puzzled.
Hi Renatoa,

All calculator programs use what are called "Prop Constants". These constants define the characteristics of the prop. The way we get these constants is through sometimes exhaustive empirical testing of the props until they give up their constants. We can then use these constants in different calc programs, like MotOCalc, WebOCalc, etc.

If prop constants can't be found, then WebOCalc simply doesn't contain that particular prop. If prop constants are found, then WebOCalc may be telling you that the 13x10 prop you have is not right for the application you're trying to fit it to.
Old Jul 02, 2010, 12:39 PM
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Excellent thread!

Is there anything similar out there (thread, tool, whatever) for choosing quadrotor motors and props?

Thanks
Roy
Old Jul 02, 2010, 12:46 PM
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None that I'm aware of. Roy. Maybe the guys over in Power Systems can help?
Old Jul 11, 2010, 08:07 PM
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my karma ranover my dogma
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Hi Chuck!

I am trying to select a power system for my little LongEZ380. (not maidened yet)

Here's what I got so far...

AUW 33oz.
Wing area 251 sq.in.
2100mah 3 cell

Now the problem comes in with the parts I already have on hand...

I have this motor...
http://www.hobbycity.com/hobbycity/s...idProduct=2106

...but it's only rated for 1000kv.

I would like to use a GWS 9X5 3 blade prop.

Web-O-Calc doesn't seem to have 3 blade props so how would I adjust the numbers?

Here's a screen shot of the closest I could get...

....and a few pics of the plane.

Looks like I may need a higher Kv motor...

Your thoughts?

Thanks!
Old Jul 12, 2010, 05:28 AM
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Compute for 2 blades and subtract 1 from diameter or pitch.
In your case, 8*5 or 9*4 three blades should be fine.
But not this lame gws prop, get a Master Airscrew...
Old Jul 22, 2010, 01:08 PM
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um.. yeah, I can make that fly
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Quote:
Originally Posted by RoyLB View Post
Excellent thread!

Is there anything similar out there (thread, tool, whatever) for choosing quadrotor motors and props?

Thanks
Roy
Hi roy, Im in the process of building a quad, I dont know of any particular tool but ask any of the guys in this thread;

https://www.rcgroups.com/forums/show...60552&page=585

Theres alot of experienced members in there.

great thread noflyzone! Bringing knowledge to the uninformed masses!

CJ
Old Jul 25, 2010, 12:28 AM
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This thread is amazing! Thank you kindly nofly for taking the time and patience for a fantastic lesson. It's really helped me figure the power plant for my next plane. I cant say it enough, TY, TY, TY! What a guy!
Last edited by icarus46; Jul 26, 2010 at 08:42 PM.
Old Jul 25, 2010, 12:41 AM
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Quote:
Originally Posted by icarus46 View Post
This thread is amazing! Thank you kindly nofly for taking the time and patience for with fantastic lesson. It's really helped me figure the power plant for my next plane. I cant say it enough, TY, TY, TY! What a guy!
Hi icarus,

Thank you so much for the kind words! You just made my day for me...

Chuck
Old Aug 04, 2010, 03:01 PM
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I agree with all the great things said about the wonderful info provided in this thread. Now I wonder if there is a word processing expert here who can cut, copy, and paste the posts into a step by step process? I'd even like to print this out if it could be distilled. Anyway thanks again.

Vince
Old Aug 05, 2010, 03:05 AM
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I just finished reading the thread from post #1. Thank you Chuck and flieslikeabeagle! Very smooth read, as if the knowledge just flows into the reader, no humps or dips that usually distract and discourage newbies like me.

Is there anything I should look out for when calculating the setup for my bipe? Do I just add the two wing areas, or do I have to account for some draft/turbulence/inefficiency of one wing? The wings overlap to an extent.

http://www.hobbycity.com/hobbycity/s...idProduct=8785
Old Aug 05, 2010, 04:37 AM
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Hi OB1,

Nope, there's nothing to take into account for our bipe, like overlap or setback, etc. Just plug the numbers in and use it like any other plane.

And thank you for the nice comments!!!

Chuck

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