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Nov 19, 2012, 07:54 AM
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Question

Old School Conversion Question Speed 400


Hi, I have a couple Zagis that flew on speed 400 motors with 8 cell nicads. What would be an equivalent brushless, watt and KV rating to switch over to lipo 3 cell? Inrunner may mount easier but could probably fabricate mount for outrunner as well.
.


Thanks
Last edited by Tabasco; Nov 19, 2012 at 08:01 AM.
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Nov 19, 2012, 10:16 AM
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Dr Kiwi's Avatar
The easiest option is a 2835 inrunner of around 2200Kv which would spin a 6x4 on 3s at around 17-18A

http://www.giantshark.co.uk/keda-kb2...-p-402617.html
Last edited by Dr Kiwi; Nov 19, 2012 at 10:59 PM.
Nov 19, 2012, 01:19 PM
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Rich in ILM's Avatar
Quote:
Originally Posted by Dr Kiwi View Post
The easiest option is a 2835 inrunner of around 1800-2200Kv which would spin a 6x4 on 3s at around 20A
Here is an outruuner which should be around the right kv if you can get it mounted:

http://www.headsuprc.com/servlet/the...50-Zoom/Detail
Nov 19, 2012, 03:52 PM
Registered User
Did a quick search for the inrunner and could not find. Hobby King is down. May go with the outrunner.

Thanks for the suggestions!!!!
Nov 19, 2012, 04:21 PM
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wizard of odd's Avatar
Mega 16/15/4 inrunner paired with 3S Lipo of 1800-2200mAhr, 6x4 prop, around 24A. Ballistic performance guaranteed! Also check out the HET inrunners.
Nov 19, 2012, 04:28 PM
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Mark Wood's Avatar
Light Flight Rc has an ARC 2837-4 at 1800Kv for $60.

mw
Nov 19, 2012, 11:01 PM
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Dr Kiwi's Avatar
Quote:
Originally Posted by Mark Wood View Post
Light Flight Rc has an ARC 2837-4 at 1800Kv for $60.

mw
6x5.5 on 3s gets you 543g @ 80mph from 16.45A/177W

With a Zagi Carbon 5.1x4.9 on 4s you get 642g @ 97mph from 15.10A/207W
Nov 20, 2012, 12:24 AM
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Mark Wood's Avatar
Make sure you install a spar!

mw
Nov 20, 2012, 06:05 AM
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flypaper 2's Avatar
Yep. Otherwise you might run into the deadly Zagi flap!! Had that happen till I put a spar in it. I think Tic had something to do with it.

Gord.
Nov 20, 2012, 06:17 AM
Registered User
Thanks for all the info!!
Years ago I put a fiberglass spar in when I built the Zagi so maybe nice to revive the wing. Just to save me time from waiting to get home to measure, any remember what length prop the Zagi can use?
Nov 20, 2012, 10:55 AM
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Mark Wood's Avatar
I used a 6x4 most of the time. You can always open up the cut between the elevons but I would consider it kinda pointless with this airframe.

mw
Nov 20, 2012, 09:03 PM
Registered User
Does one really? have to go to motors virtually as heavy as the S400.. Seems a bit much.
Nov 20, 2012, 11:12 PM
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Mark Wood's Avatar
Helps to maintain the original balance...especially if the airframe has already been built and flown.

mw


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