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HelicopterScale Model RC Helicopters › electro converting a graupner Nh 90
11-21-2009 06:06 AM  7 years agoPost 1
Viggen65

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Gothenburgh, Sweden

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Hello

Im planning to electroconvert a graupner Nh 90 fuse using a skyfox mechs with 10:1 gear ratio, havent started the motor calculation yet but for now im planning use a Scorpion motor as in mine Hirobo Panther,do you guys know if anyone done the Nh 90 electrified before, maybe can point me to a video also, I really would get in contact with that person for some advise regarding the conversion.

Cheers
Jack

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11-21-2009 08:58 AM  7 years agoPost 2
Bo108

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germany

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Hi Jack,

may you have a look here:

http://www.rc-heli.de/board/showthread.php?t=122821

to his homepage here:

http://home.arcor.de/hport/Helis/NH90/index.htm

It´s all in german. I hope it can help a bit.

Greets

Bo

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11-21-2009 10:37 AM  7 years agoPost 3
Viggen65

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Gothenburgh, Sweden

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Wow, amazing, thanks Bo, translated it with google, real nice videos.

Thanks for sharing!!!!

Br
Jack

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11-22-2009 04:28 PM  7 years agoPost 4
Richard Morgan

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Virginia Beach,​Virginia USA

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Jack:

I have done the Skyfox conversion three times now. I recommend that you buy the electric motor mount from Eastcoast Scale Heli Vario USA. They advertise here on RR. Get in touch with Joe or Nicole and they will help you out. Make sure that you stay between 400 and 475 KV for your motor.

Here is the set up that I recommend above anything else I have used.

Motor - Actro 32-4; 415 kv with an 8mm shaft
Motor mount - Available from Vario USA
Pinion - 18 tooth, for an 8mm shaft. Available from Vario USA
Batteries - 10s 10,000mah for a 37 volt system (10s 5,000mah x 2)
Speed Controller - Castle Creations Phoenix HV 110 esc

This is a complete bolt on system that requires no modifications to the Skyfox mechanics.

This set up will allow you to run a scale head and tail 8 -10 min flight time and comes down nice and cool.

Richard

Is it just me, I thought all Helicopters flew in 3D......Hmmmm?

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11-22-2009 04:57 PM  7 years agoPost 5
Viggen65

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Gothenburgh, Sweden

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I will check this up Richard, thanks for posting.

Cheers
Jack

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11-23-2009 05:51 AM  7 years agoPost 6
WIRLYBIRD

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CAPE TOWN / SOUTH​AFRICA.

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If you do search on RR , you should pick up the conversion in Enlish , might be the same person not sure!
Dave.

WHAT GOES UP MUST SURELY COME DOWN.

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11-23-2009 05:52 AM  7 years agoPost 7
WIRLYBIRD

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CAPE TOWN / SOUTH​AFRICA.

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Sorry English.

WHAT GOES UP MUST SURELY COME DOWN.

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11-23-2009 08:49 AM  7 years agoPost 8
Viggen65

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Gothenburgh, Sweden

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Thats ok Wirlybird, translated it with goggle, works fine, really impressed with the Nh 90 and the electric driveline, seems to work very well and the sound is great!

Cheers
Jack

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11-23-2009 11:10 AM  7 years agoPost 9
WIRLYBIRD

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CAPE TOWN / SOUTH​AFRICA.

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Hi Jack glad you sorted , looks like electrics are going to be a big challenge to the turbine industry!!
Dave.

WHAT GOES UP MUST SURELY COME DOWN.

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11-23-2009 08:36 PM  7 years agoPost 10
Héli Suisse

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Geneva Switzerland

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Yes Dave I fully agree with you having both a PTH3 and a Plettenberg EC135. The ease of use of the latter compared to the former! I'm just missing the smell of kero and the flight duration (15 min. vs. 8)

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11-27-2009 09:19 AM  7 years agoPost 11
Viggen65

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Gothenburgh, Sweden

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Hello

as speaking im planning the setup for mine Nh 90 conversion with the skyfox 10:1, target rpm is 1250-1300 rpm and mine calculation would look like this, please correct me if im wrong here and dont order wrong stuff, planning to go for 10s 20-25c rating

37volt x 400kv = 14800 rpm

14800/10 = 1480 rpm

1480 x 0.9 efficency = 1332 rpm

1332 rpm that can be gowed down a littlebit to about 1250-1300 rpm

Im I right here?

Regards
Jack

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11-28-2009 02:06 AM  7 years agoPost 12
Jason Lewis

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Whitby, Ontario,​Canada

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Hello Jack

A great tool for conversions is Mr Mel's calculator. It is on ReadyHeli's front page on in the left columb. It is very accurate!
Try plugging your numbers in for a double check.

Jason

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11-28-2009 08:27 AM  7 years agoPost 13
Viggen65

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Gothenburgh, Sweden

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Seems to be accurate, thank you, what I dont understand is that its stated on Varios site that the 10:1 skyfox has a 55 teeth maingear and 22 teeth clutch pinion, how do they get 10:1 from this????

Help appreciated

BR
Jack

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11-28-2009 09:52 AM  7 years agoPost 14
Viggen65

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Gothenburgh, Sweden

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ok, figured out

pinion 22
maingear 55
third pinion 10
internal gear 40

22/55=2.5
10/40=4
2.5x4=10

Cheers
jack

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