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HelicopterMain Discussion › Thunder Tiger 50 engine on 30 size heli
11-26-2007 02:23 PM  10 years agoPost 1
Pluggin

rrNovice

Bueno Aires, Argentina

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I burn out my OS 37 engine of my 30 size heli...
I like to know i I could use the thunder tiger 50h engine to replace the os37 without modding anything in the heli, like gear, boom, blades, etc

Regards

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11-26-2007 02:41 PM  10 years agoPost 2
baby_zyklon

rrElite Veteran

Singapore

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You need a 50size engine mount and fan.

The rest will work, but the engine will be screaming. Try to at least change to the 50size gear ratio if you are keeping those 550mm on.

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11-26-2007 03:30 PM  10 years agoPost 3
SkateFreak

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Cambs UK

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I would disagree...
The only difference between the 30/50 fan is the colour...
I'm pretty sure the engine mount is the same but i could be wrong there heh.
As for gearning...
you should be just fine!
I had a friend who flew an R30 with a TT50 in it for ages and he was running stock gears, fan etc...
Just keep the throttle curves down to stop over reving the head
no need to be over cautious...

-Jvr

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11-26-2007 03:35 PM  10 years agoPost 4
Captain Crazy

rrApprentice

Wakefield, England

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50 engine mount would be required for definite.

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11-26-2007 03:50 PM  10 years agoPost 5
AirWolfRC

rrProfessor

42½ N, 83½ W

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The only difference between the 30/50 fan is the colour...
Not true.
The 50 fan has a raised boss on the bottom about 2mm worth.
This is because the motor shaft is longer than the 30 size.
You can make that up with washers if you feel the need to reuse the 30 fan.

Yes, you need a 50 size motor mount.
The motor sits lower in the frame and it's wider.

Changing to the 8.5 gear set is also recommended because the 50 size motor does not like to rev as high as the 30 size.

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11-26-2007 05:16 PM  10 years agoPost 6
Pluggin

rrNovice

Bueno Aires, Argentina

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Thanks guys for the reply!!! The heli I own is a JR Airskipper 30
About the main gear I search in the mcgregor site and the manual of the .30 and .50 heli size show the same piece.
Im agree about the engine mount but I couldnt find anything to be sure...

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11-26-2007 11:35 PM  10 years agoPost 7
baby_zyklon

rrElite Veteran

Singapore

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I would disagree...
The only difference between the 30/50 fan is the colour...
I'm pretty sure the engine mount is the same but i could be wrong there heh.
As for gearning...
you should be just fine!
I had a friend who flew an R30 with a TT50 in it for ages and he was running stock gears, fan etc...
Just keep the throttle curves down to stop over reving the head
no need to be over cautious...
I would disagree too

1.The fans are not the same.

2.The engines mount are again not the same.

3.At the stock ratio of 9.56 on the r30(I think airskipper30 has got a
9.66???), you will be reving the arse off the tt50 at a headspeed of 2000rpm. More than 19000rpm on the engine, which I believe is way past the peak output range. The 50size gearing(8.5 on raptor and 8.7 on airskipper???not sure about the airskipper) will drop the engine rpm to a nice 17000+rpm. Surely you could drop the headspeed, but it already has got limited pop and pull with the 550mm compared to the 600mm, dropping the headspeed will make it worse.

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11-27-2007 12:44 AM  10 years agoPost 8
Raptor Pilot

rrVeteran

Northern Ireland U.K

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Suprise suprise boys, i to dissagree! The 50 fan has a boss about 2mm extra on the bottem of it to keep it slightly further away from the engine and the 50 engine deffinatley needs the 50 size mount as the standard 30 one is way too small and looks completly differnt. Also you need the 10 toothed pinion and the 85 toothed main gear or the engine will be bustin its balls. The white colourd constant tail drive gear instead of the standard red non constant tail drive gear would be an advantage for fancy autos.
How do i know?
Been there,done that and got the tee shirt!!!

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11-27-2007 01:14 AM  10 years agoPost 9
AirWolfRC

rrProfessor

42½ N, 83½ W

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Are we talking about the TT fan ?
or just the TT motor ?

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11-27-2007 01:30 AM  10 years agoPost 10
Raptor Pilot

rrVeteran

Northern Ireland U.K

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Im talking about the TT fan.

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11-27-2007 01:32 AM  10 years agoPost 11
AirWolfRC

rrProfessor

42½ N, 83½ W

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Yes, I know you are and so did I (on an assumption).

But what about the original poster ? He has an air skipper.

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11-27-2007 01:34 AM  10 years agoPost 12
Yug

rrMaster

UK. Herts

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I wouldn't worry about the fan (use QUK) but the ratio is critical as you don't want a 50 screaming too much as you'll kill it. Given it's peak power is at 17000rpm, then 8.5 or lower would be preferred. But there again it depends on what kind of performance profile you're after. Why not turn it into a proper 50 size heli ?

Vegetable rights and Peace

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11-27-2007 05:45 AM  10 years agoPost 13
steve9534

rrKey Veteran

yakima, wa.

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TT50

I had another 50 size heli with a TT50 and purposely went out and bought the 30 size gearing because the motor would bog with the stock 8.7:1 gearing. Why not try the stock gears before buying something else? The fan can be shimmed to fit. The only essential component to complete the conversion is the motor mount. steve

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11-27-2007 09:38 PM  10 years agoPost 14
Raptor Pilot

rrVeteran

Northern Ireland U.K

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OOOOOPS! sorry about that AirwolfRC, i assumed once the TT50 engine was mentioned that the helicopter was a raptor. I couldnt see the wood for the trees as people would say.

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11-27-2007 11:27 PM  10 years agoPost 15
payne1967

rrElite Veteran

uk

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you can get away with the 30 gearing
with a shuttle i did a few years ago I used an os50sxh ,std shuttle 30 gearing , sceadu boom and hirobo stalk drive belt and 600 blades
the power was great , no over speeding issues just the very short flight times due to a small fuel tank and the os50's liking for lots of fuel
i used the hirobo lama 46 engine mount and the 30 sized shuttle fan/clutch hub as the 46 one was too long for the main frame (plus a few extra engine mounting holes and cut outs for the carb mixture screws )
with the air skipper use the 50 pinion and engine mount and see if you can get away with the fan/clutch hub , if not you'll have to use the 50 one and try 570 blades from the mk1 sceadu 50

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HelicopterMain Discussion › Thunder Tiger 50 engine on 30 size heli
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