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Scorpion Power ProModeler
HelicopterEngines Plugs Mufflers Fuel › Official OS 91HZ-R Review Thread
06-03-2010 11:42 PM  7 years agoPost 21
Aaron29

rrProfessor

USA

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There's a vid that says the OS91HZ-R is for 3D while the unregulated version is for FAI.

What is the benefit to an FAI bird in going unregulated? The FAI version with the inflight mixture adjustment is great and all, but I can put an inflight mixture adjustment on the HZ-R, too and have the best of both worlds.

I don't see why the OS91HZ-R shouldn't also be for FAI. Is there something bad about having a regulator for FAI?

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06-04-2010 03:07 AM  7 years agoPost 22
Dr.Ben

rrMaster

Richmond, VA, USA

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Is there something bad about having a regulator for FAI?
HELL NO!

Honestly, I don't think anyone is completely clear on the basis for the advertizing distinction for the engine types and the two flying disciplines. For anyone with half a clue, a perfectly consistent fuel delivery system is as advantageous for FAI as it is for 3D, or vice versa. The HZ-R is a superb choice for both FAI and 3D.

Ben Minor

Team Synergy Team Futaba Team Kontronik USA
Progressive RC

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06-04-2010 02:38 PM  7 years agoPost 23
ssmith512

rrKey Veteran

Indianapolis, IN USA

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Just got my new HZ-R today. Coming from an OS SZ (with HZ rotating internals) with Cline carb. Looking forward to comparing the two.

Steve

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06-14-2010 02:00 AM  7 years agoPost 24
sumonzu

rrApprentice

San José - Costa Rica

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Just got my new HZ-R today. Coming from an OS SZ (with HZ rotating internals) with Cline carb. Looking forward to comparing the two.
Any news? How about your needle setting? Which fuel do you use?

Thank you!

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06-14-2010 01:36 PM  7 years agoPost 25
ssmith512

rrKey Veteran

Indianapolis, IN USA

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Any news? How about your needle setting? Which fuel do you use?
Motor runs beautifully. I run coolpower 30%. I use both shims (1 thin and 1 thick) in the head. I am about 3/4 open from fully closed on the mid and 1 3/4 to 1 7/8 open from fully closed on the high. Probably could lean the high a little, but it is running strong and clean and cool. The needles are very consistant from day to day and VERY consistant throughout a tank.

Steve

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06-24-2010 08:56 PM  7 years agoPost 26
clearsky

rrApprentice

connecticut

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fueling

When filling through a "T" fitting where does the filling pressure get released from in this closed system, is a second "T" fitting needed,
does the CHECK VALVE stop fuel from entering the crank case when filling. As you can see I need some clarity on this.

Thanks, Bob

Keep'um in sight

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06-25-2010 01:34 AM  7 years agoPost 27
sumonzu

rrApprentice

San José - Costa Rica

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Here in the picture how to connect the two T fittings: one is just to allow the pressure release once landed AND during the filling; the other one (my T is actually a useful 3 way valve) is used for FILLING. The picture shows the T valve in the filling position.

Hoping it solves your problem.

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07-18-2010 06:17 PM  7 years agoPost 28
knightofcarnage

rrElite Veteran

chicago

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Do you have to run both shims if your using 30%. the book says you may use both shims. I'm only using .2 shim. what does using both shim actual do: lower the compression or changes the ignition point?

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07-19-2010 01:47 AM  7 years agoPost 29
Dr.Ben

rrMaster

Richmond, VA, USA

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For some fuels with thicker oil packages and/or at lower heights above sea level, the added shim reduces the compression a bit, retards the timing, and can make the needles less critical, improve plug longevity, and allow for smoother running.

IF your engine is running fine on one shim and REGARDLESS of how much nitro is in you fuel, then there is no mandate to run the added shim.

Ben Minor

Team Synergy Team Futaba Team Kontronik USA
Progressive RC

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07-19-2010 01:49 AM  7 years agoPost 30
marc8090

rrElite Veteran

Long Island, N.Y.

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I'm running both of mine the way they came shimmed out of the box, on Cool Power 30%, at 80 feet above sea level with no detonation issues.

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