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HomeAircraftHelicopterAlignT-REX 700N › 700n with OS GT15HZ 3D?
02-20-2013 02:45 AM  5 years agoPost 1
hobbyfreak55

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knightstown,IN USA

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is anyone testing the new os gt15 hz? i wanna know if u are changing gear ratios and what kind of performance it has and if there is anything else you changed to make it do 3d better

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02-20-2013 11:19 AM  5 years agoPost 2
Richardmid1

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Leeds, England

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It will do slow graceful 3D only no matter what you do with gear ratios, most helis you can't easily change the gear ratio anyway. If you did lower the gear ratio to get more head speed it would be a serious bog fest!

Personally I think this motor would be best in a 50 if doing 3D.

60% of the time, it works every time!

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02-20-2013 01:00 PM  5 years agoPost 3
hobbyfreak55

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knightstown,IN USA

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is the weight of it the drag to doin 3d or just doesnt have the power?

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02-20-2013 01:05 PM  5 years agoPost 4
Richardmid1

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Leeds, England

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Doesn't have the power. You can improve the weight by only half filling the tank as it will do 25 mins on 300cc of fuel.

60% of the time, it works every time!

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02-20-2013 01:11 PM  5 years agoPost 5
hobbyfreak55

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knightstown,IN USA

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okay i see so the 105 would be the better choice for 3d
thanks for the information

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02-20-2013 01:23 PM  5 years agoPost 6
Richardmid1

rrProfessor

Leeds, England

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Yes even a regular 91 would be much better for 3D.

60% of the time, it works every time!

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02-20-2013 01:56 PM  5 years agoPost 7
Four Stroker

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Atlanta

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Contrary to what you read on forums, the vast majority of heli pilots are sport pilots who would love the fuel economy of this engine. I am sure OS has done their market research. It is claimed that it has about the power of an old say OS 70 or maybe YS 80.

This is not the engine for smack crack maniac 3D if that is what you really do. Heli pilots are like fat girls in sports cars.

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02-20-2013 02:33 PM  5 years agoPost 8
Richardmid1

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Leeds, England

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Heli pilots are like fat girls in sports cars.
Lol!

It would sure teach you good collective management thats for sure.

60% of the time, it works every time!

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02-20-2013 04:59 PM  5 years agoPost 9
hobbyfreak55

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knightstown,IN USA

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ya thats how my os91sz is lol i have to really work on collective to do anything really i have a 91hzr now its much better

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02-20-2013 05:37 PM  5 years agoPost 10
Four Stroker

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Atlanta

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Probably 660~680 blades.

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02-20-2013 05:52 PM  5 years agoPost 11
fastflyer20

rrKey Veteran

N. Tonawanda, NY

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It is 1/2 the CC's of many of the Zenoah gas engines being used, so 700 class power will not be it's strong suit.

It will be interesting to see how it will preform in a 600 size heli with 620-640 blades.

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02-20-2013 05:55 PM  5 years agoPost 12
Richardmid1

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Leeds, England

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You would definitely have to use different gearing in a 600 though.

60% of the time, it works every time!

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