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Old Jul 09, 2007, 08:24 PM
Sir Buildsalot
MailOrderGuy's Avatar
Stockbridge, GA
Joined Nov 2002
646 Posts
Video
My 650 Watt TwinJet w/ 2X Mega 16/15/3's can someone doppler for me?

I'm using a 3S2P 4200 Prolite and 4.75x4.75 APC props.

I want to get a idea of what speed I'm getting out of this setup.

Can anyone tell me what thrust each motor is producing??

All the videos are from the same flight, I wanted to give someone with the doppler software a good sampling.

Thanks in advance
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Old Jul 09, 2007, 09:16 PM
Wonderfully Wicked
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Willoughby, Ohio
Joined Jan 2002
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First video I get about 93 mph and about 25000 rpm.
25000 * 4.75 /1056 = 101 mph pitch speed so 93 is about right.
Pass 2 about 93 mph
Pass 3 about 96mph
Pass 4 about 87 mph

Nice job!

Don
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Last edited by The Don; Jul 09, 2007 at 09:23 PM.
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Old Jul 09, 2007, 10:01 PM
Sir Buildsalot
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Stockbridge, GA
Joined Nov 2002
646 Posts
Many thanks Don

My TwinJet sure turns heads at the flying field.

The glow guys are just amazed at my little electric plane
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Old Jul 14, 2007, 10:10 PM
Sir Buildsalot
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Stockbridge, GA
Joined Nov 2002
646 Posts
UPDATE

Bought a Bushnell radar gun today from Sports Authority.

The TwinJet was radared at 97 mph on one pass and 95 mph on another, which varifies the data in the earlier post.
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Old Jul 14, 2007, 10:56 PM
Use whatcha got!
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Metairie, LA
Joined Sep 2000
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MOG - how many amps are each motor drawing @ WOT?

thanks,
msmith
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Old Jul 15, 2007, 07:24 AM
Sir Buildsalot
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Stockbridge, GA
Joined Nov 2002
646 Posts
Quote:
Originally Posted by msmith
MOG - how many amps are each motor drawing @ WOT?

thanks,
msmith
30 amps each
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Old Jul 15, 2007, 11:31 AM
Use whatcha got!
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Metairie, LA
Joined Sep 2000
2,982 Posts
Ugh... too much for my current battery selection...

I'm looking for 30 amps total between the two motors... Am I dreaming here? Or should I just sell the twinjet to someone local?

I'd like to try for a light build and really just use my current batteries... Not necessarily looking for blistering speed, but 50-60mph would be nice if it can be done on 30amps...

-msmith
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Old Jul 15, 2007, 03:06 PM
Sir Buildsalot
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Stockbridge, GA
Joined Nov 2002
646 Posts
Quote:
Originally Posted by msmith
Ugh... too much for my current battery selection...

I'm looking for 30 amps total between the two motors... Am I dreaming here?

-msmith
No your not dreaming, try this set up,

Two Little Screamer Park Jet motors w/ APC 6x4E props
Two CC ThunderBird 18 amp controllers.

It will keep the weight down alot and give you that 60 mph range you are looking for.

I'm speaking from expeirence, I have a single Park Jet w/ TB18 and 6x4E prop on my Micro Jet, it draws 14-15 amps at WOT.
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Old Sep 01, 2007, 05:31 PM
Yep I got another one.
mohillbilly's Avatar
Springfield, Mo.
Joined Jan 2005
2,529 Posts
Quote:
Originally Posted by msmith
Ugh... too much for my current battery selection...

I'm looking for 30 amps total between the two motors... Am I dreaming here? Or should I just sell the twinjet to someone local?

I'd like to try for a light build and really just use my current batteries... Not necessarily looking for blistering speed, but 50-60mph would be nice if it can be done on 30amps...

-msmith
Easy and cheap! I did it with 2 $6 outrunners, 18A cheap ESC, and a single 2100 3cell 15C pack.

Mo.
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Old Sep 20, 2007, 09:21 AM
Registered User
Cottonwood Arizona
Joined Aug 2003
584 Posts
Fast and Cheap

I put 2 2409-12 motors (1650 kv) running on 7.5 props and they about 30 amps total and the plane does 70mph. If you buy the motors from united they are $9 each, or get them from ebay for $18 each. United even has the motor and controller combo for under $20. Yes really. Been flying this setup for a year now and love it, just about unlimited vertical too. I run on a 3 cell 4000 pack and the weight is a non-issue. Put the controllers on the outside surface of the wing and they stay cool. Fast, thrust, and cheap.
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