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HomeScaleAircraftHelicopterScale Model RC Helicopters › Graupner NH 90
05-30-2012 07:26 PM  6 years agoPost 1
SJN

rrApprentice

Denmark EKCH

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Hi Guys.

I just bought this second hand NH 90 from Graupner for a reasonable price i think

It has never been flown or started up, and the builder knew nothing about RC choppers.

So I have stripped it down to inspect everything, and re lubricate the moving bits.

He assembled it allright after the manual, and no complaints there....even though I would have done a few things diffenrtly.
It has a little hangar rash, but nothing major. I will be re-painting it eventualy.....thats the plan..

He must have kept it in a bad place, as there is quite a bit of surface rust in the control links and screws. Engine is in mint condition luckily. The electrics are also in great condition, but the rubber servo grommets are perished.

Anyone out there flying the Graupner UNI 2000 mechanics ?
Are they ok ?
Is the included OS 91 SX and pipe combo good ?

There was a JRG5000T gyro and a mc-heli control governor included. Are these up to todays standards ?

I have no idea of how old this might be.

This is one HUGE helicopter though

Sonnich Johannesen

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05-31-2012 02:03 AM  6 years agoPost 2
Skytrek

rrApprentice

Suffolk, Va

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Graupner stuff is very good! I say go through the old girl and get he going again with updated electronics. Depending on the cost you might even think about to changing the heli to all electric. The old fuses are usually heavy but well made. Keep us posted and send pics of the old girl taking to the sky's again.

Barry London

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05-31-2012 04:54 AM  6 years agoPost 3
Christopher J

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Kansas City, MO Californian lost in land of Oz

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Everything you have will work. Just because there are new mixers, governors, ect doesnt make them better, just newer. Go through the mechs, build it back up, fix flaws and fly it. Check the specs on your motor. Most motors designed for use in Vario and Graupner helis were made to run on low to no nitro fuels. (0%-5%)

Christopher J
same as I ever was
"Still all set & Flying the original"

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05-31-2012 07:09 PM  6 years agoPost 4
Totto

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Norway

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Hello,

Its a great model.

Suggest you to change out the 2 mm drive shaft system with a Vario or similar torque tube system all the way up to the tailrotor.
I found this 2 mm thing to be a joke in the long term use.

Here is a build up of my NH-90 turbine model if it could be of any help. http://www.tottoshobby.net/NH90/fside.htm

I would say convert it to electric.

Good luck !


Best regards
Totto

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06-02-2012 02:27 PM  6 years agoPost 5
SJN

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Denmark EKCH

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Thanks for the input guys.

Im not an electric guy, so it will be flown with the glow motor.
Love the sound and clean operation of electrics, but life is too short to wait for the batteries to re-charge

I like the vario tail drive system very much, but it is too expensive. I got this deal for a low price, and I want to keep it that way. Just use it for what I got and as it is.
But I agree....the tail drive system is quite marginal....but low weight. I am a mechanic, and have worked on fullsize helis before, and the real tail drives also seem margianl in strength whan you look at them
It can always be upgraded later on if this becomes my favorite heli in the future....who knows

I have gone over the mechanics and engine, and it all looks fine. Got 32 new rubber gromets for the servos. disassembled the rotorhead, and have cleaned and lubed the bearings and dampers. Going to take out the 2 tail gearboxes, and service them next. Main blades are not in great shape even though they have never been used. Nose strut is very rusty, and will get treatment

Sonnich Johannesen

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06-03-2012 12:10 PM  6 years agoPost 6
SJN

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Denmark EKCH

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Phosphoric acid doing its job on the nose strut.

Painting the cockpit interior, and wooden framework, I saw the large gaps under between the frame and fuselage. I will spread some 24 hour epoxy and microbalooons into the seems before I go any further....

Sonnich Johannesen

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06-03-2012 05:13 PM  6 years agoPost 7
goodhunting

rrVeteran

Slovenia ... somewhere in Europe

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I like the sticker from the inside of the fuselage...

gh

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06-03-2012 06:21 PM  6 years agoPost 8
SJN

rrApprentice

Denmark EKCH

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hehe....do you know the guys who made the fuselage ?
The sticker is laminated under the glass cloth.

The glass work on the fuselage is absolutly flawless.

Got some epoxy under the frame.....

Sonnich Johannesen

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06-03-2012 07:39 PM  6 years agoPost 9
goodhunting

rrVeteran

Slovenia ... somewhere in Europe

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Wish I would know them...
might get a good deal on the fuse this way...

there are two major fiberglass factories out here but there are also a lot of smaller ones, which are awesome in what they do...

will keep an eye on this post

gh

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06-04-2012 01:53 AM  6 years agoPost 10
Jockobadger

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Snoqualmie, Washington USA

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Dang! Even with the slightly raggedy bits, that is a beauty. No problem to get it shined up very nice. You lucky dog! Those are awesome helis. Good get.

Century Bell 47 III, RCA,700 UH-1N, Hirobo Lama, Logo 500, Logo 400, Trex 550e, HC3SX, Kontronic

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06-04-2012 07:41 PM  6 years agoPost 11
SJN

rrApprentice

Denmark EKCH

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Thanks Jockobadger, this is quite an awesome helicopter....it has a good size to it

The stabilizer has obviosly been knoked off and re-glued a few times even though it has never flown.

So I decided to make it removable for transport.

Turned out allright, and just need to make a retainer screw to fasten it to the fuselage.

Sonnich Johannesen

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07-03-2012 07:15 PM  6 years agoPost 12
SJN

rrApprentice

Denmark EKCH

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Got a little more done to the great white

The cockpit is remoavable, so it can be tweaked later on....just keep it basic for the test flights.

New servos installed. Have to take care the servo wires dont rub against the moving parts, as they are close some places in the heim mechanics.

Sonnich Johannesen

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07-04-2012 07:20 AM  6 years agoPost 13
Christopher J

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Kansas City, MO Californian lost in land of Oz

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Fantastic re-work so far. Stay with it, it's looking good.

BTW, nice looking F-16. <jealous> What are you powering it with?

Christopher J
same as I ever was
"Still all set & Flying the original"

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07-04-2012 03:40 PM  6 years agoPost 14
SJN

rrApprentice

Denmark EKCH

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Thanks.

Its a Jetlegend F-16 powered by a Jets munt Merlin 100 1kg/22lbs thrust turbine made by Gaspar in Spain.

Also have an F-18 blue angels. Great looking aircraft

Sonnich Johannesen

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