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HelicopterEngines Plugs Mufflers Fuel › 90 size engine
08-01-2013 06:35 PM  4 years agoPost 1
TooLy

rrVeteran

Israel

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HI,

After a break of almost 3.5 years without helis, many things have changed.
I noticed some new 91 class engines and bigger.
I had a few HZ 91 in my 700N in the past and they were great.
What is the story with the OS HZR 91 SPEED 3D &3C ?
Can they compete with the 105 ?
Any review about the TT redline 100 ?

Thanks,
Roei

~Roei~

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08-01-2013 07:26 PM  4 years agoPost 2
BONO1

rrApprentice

AR

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I have a TT 100. Its less expensive than most and it runs good and has torque that will out perform my old OS 91SX with the cline carb setup but seems not to like the high rpms compared to a 91 or 105. My friend has a 105 and the new YS91 that clearly out does the 105. I've never had an OSspeed 91 or been around one so I can't really comment on those.

Sam

blow smoke

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08-02-2013 07:07 AM  4 years agoPost 3
TooLy

rrVeteran

Israel

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That's interesting thing about the rpm, the specs of the TT show the max hp in lower rpm (14,500) vs os or ys with 15500-16000.
Do you run your TT 100 with longer gear ratio or stock ?

~Roei~

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08-05-2013 03:42 PM  4 years agoPost 4
Richardmid1

rrProfessor

Leeds, England

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OS 91HZR Speed 3D with OS powerboost pipe is a monster combo and easily capable of keeping up with a 105.

60% of the time, it works every time!

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HelicopterEngines Plugs Mufflers Fuel › 90 size engine
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