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T-REX 550 › 550 L Dominator with Scorpion 4025-890
01-23-2016 04:54 PM  31 months agoPost 1
heliflight

rrApprentice

uk

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Hi,

I have been reading about people using and getting good results with fitting a 4025-890kv scorpion motor. Would this be the best size to use? I have also read about putting the 1100kv one in too, would this not be too high for the gearing?
And my next question is those who have done this mod, how do you make it fit in the model? Mount? Shaft counter bearing etc?

Thanks in advance

Dave

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01-24-2016 03:11 AM  31 months agoPost 2
Heli Fanatix

rrVeteran

Fountain Valley, CA

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edited ...

4025-890kv would work with some modifications to get around issues you mentioned. I agree with jsenika, the 730MX already make plenty of power.

If anything .. Invest in a:
- kontronik 100LV
- opti power 6S 5000mah 50C

you will love it!

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01-24-2016 02:13 PM  31 months agoPost 3
jsenicka

rrProfessor

Eagle River, WI

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he is talking about a 550.
the Scorpion 4025 is actually a tiny bit smaller than the 730MX.

That said, I have had good luck with my stock 730MX in the 550L

Jim Senicka
Team Manager, GrandRC Flight Team

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01-24-2016 07:35 PM  31 months agoPost 4
heliflight

rrApprentice

uk

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Interesting, I cant get mine to fit the mount, so its foot print must be bigger. I guess people mod or change the engine mount and this is how I would like to find out how to fit it.

Yes indeed its the 550 L Dominator and sadly I don't have the align 730mx to compare.

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01-25-2016 02:20 PM  31 months agoPost 5
tgalo

rrVeteran

USA

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Yes the Align 730 mx has a 30mm spacing and the 4025 has a 25mm. I believe the frame spacing on the 550L is unique. A friend tied to use the 600 pro KDE mount on his 550 dominator and it was just a hair to big to fit between the frames. Be interested to see how guys have done it...

Gravity's a bitch ant it?

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