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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › New O.S. 91 HZ-R - new photo in page 4
02-07-2010 07:33 PM  8 years agoPost 1
snowman999

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nottingham

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Attached is a brochure shows a picture and specs of the engine

OS product code: 18640,shipping in Mar!

Conversion Set consists of Carburetor integrated with regulator, Back plate fitted with a pressure nipple and check valve.

First production is scheduled to complete early March.

Here are features.

- This is a main fuel tank pressurized regulator system integrated version of the 91HZ.
- Newly designed 61E Carburetor integrated with a regulator surely regulates pressurized fuel. As with other 91HZ engines,
it features twin needles which can adjust hovering and high speed flight independently.
- Regulator is located at a place where heat does not suffer and access is easier.
- The system ensures stable fuel supply irrespective of rapid model attitude and G changes.
- The system does not use muffler pressurized fuel system which requires needle adjustment according to the change of
muffler pressure.

SPEC.
Displacement : 14.95cc (0.912cu.in)
Bore : 27.7mm (1.091in)
Stroke : 24.8mm (0.976in)
Weight : 625g (22.05oz)
Output : 3.4ps/15,000r.p.m.

New O.S. regulator coming soon!

"It looks like O.S. is getting very close to releasing the new 91 HZ-R engine, which is basically a stock 91 HZ that will ship with the new regulator system that I have been testing since June of last year. This regulator works with crankcase pressure and delivers a very consistent run from beginning to end, it also improves performance as well as mid range response. It is unknown exactly when it will be released in the US, but I am guessing sometime in the Spring. It will of course be available in Asia first and I’m sure a lot of people will order it directly from an Asian shop

It is also unknown at this time, but apparently O.S. will sell the carb by itself, so that it can be installed on any O.S. 91 HZ motor or even on an Align H motor."

Links from: http://www.bertrc.com/archives/454

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02-07-2010 10:14 PM  8 years agoPost 2
synodontis

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United Kingdom

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that is such a beautiful thing.

I'm glad OS have finally gone over to the Cline, basically the smoothness of an OS HZ with the consistency of a YS.

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02-08-2010 12:30 AM  8 years agoPost 3
jsenicka

rrProfessor

Eagle River, WI

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Actually they have gone over to an OMI.
Jim O"Neal did the design work on the regulator and fuel passage changes as I recall. That means you get all the goodness of an OMI modified carb without the somewhat clunky Cline regulator and fuel line issues.
It is a beautiful motor!

Jim Senicka
Team Manager, GrandRC Flight Team

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02-08-2010 01:22 AM  8 years agoPost 4
snowman999

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nottingham

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Anyone knows how does the OMI regulator work? supposed to has same concept as a YS

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02-08-2010 02:58 AM  8 years agoPost 5
Dr.Ben

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Richmond, VA, USA

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Correct Jim,

OS licensed the design from OMI. James O'Neal and Steve Helms did the R&D.

Those who have bitched about OS fuel systems well cease to do so with this engine. The reg is beautifully machined and works incredibly well.

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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02-08-2010 03:08 AM  8 years agoPost 6
ferincr

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From Argentina now in Costa Rica

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Me wants one!!!!!!
I was looking into the ZH today as I´m pretty sure my SZ-H got quite toasted today

Intelligence chases me, but I'm a lot faster! Fernando

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02-08-2010 06:20 AM  8 years agoPost 7
Heli Davey

rrApprentice

springfield,mass

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I will look for an excuse to tell my wife my motor died and need a new one in the spring!!lol

*TREX 500ESP*TREX 600NSP*TREX 700N LE*

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02-08-2010 12:08 PM  8 years agoPost 8
jsenicka

rrProfessor

Eagle River, WI

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The new OS uses pressure from crank case via a one way valve to pressurize the tank, just like a YS. Advantage here is no exhaust pressure = no clunk line decay or fuel magnet rot.

The carb uses a demand regulator similar to a scuba setup. A tiny bit of vacuum on the carb side pulls open the regulator, allowing fuel to flow. This is what the Cline unit did on the OMI modified carburetors. You also need internal modifications to the carb to ensure it can pull a vacuum at wide open throttle to actuate the regulator (and this is why you could not just bolt on a cline to a stock carb, or this new regulator to a stock SZ/HZ carb).

I have never disassembled a YS regulated carb. I do not know if it is straight vacuum operated demand regulator, or the fact it is mounted on bottom of the crank means anything.

Jim Senicka
Team Manager, GrandRC Flight Team

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02-08-2010 01:18 PM  8 years agoPost 9
wings19

rrKey Veteran

Tucson, AZ

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Looks good! It sounds like you can just get the conversion kit if you already have the HZ, I like that!

Nick
If the wings are traveling faster than the fuselage, it's probably a helicopter

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02-08-2010 03:44 PM  8 years agoPost 10
777ER

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Westchester county, NY, USA

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I hope this is better than the OS HZ-PS 3D pumped verison that's prone to problems.

Pending reviews and reports, it may be either this OS 91 HZ-R or the OS 91HZ for my new 90.

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02-08-2010 06:08 PM  8 years agoPost 11
Santiago P

rrProfessor

South West, Ohio

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I hope this is better than the OS HZ-PS 3D pumped verison that's prone to problems.
Rest asure, its gonna be a great engine. James O'Neal and Steve Helms are the guys behind most sweet running engines you ever seen. Great move from OS to get their smarts from them.

The bad: Expect a $$$$$$$$ price tag.

tha pit is getting way deeper...

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02-08-2010 06:14 PM  8 years agoPost 12
blade3d

rrElite Veteran

New Jersey USA

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Guess OS finnaly got on the YS Boat, all those that suffered for years with OS, Hmmmm poor thing now they will have an engine as good as YS I guess. will they also do the same with the 55 ?

Blade3d

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02-08-2010 06:18 PM  8 years agoPost 13
777ER

rrApprentice

Westchester county, NY, USA

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Rest asure, its gonna be a great engine. James O'Neal and Steve Helms are the guys behind most sweet running engines you ever seen. Great move from OS to get their smarts from them.

The bad: Expect a $$$$$$$$ price tag.
Then that should be my engine choice for the coming soon 90...

Now what's the price tag gonna be...

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02-09-2010 01:08 PM  8 years agoPost 14
Costas

rrApprentice

Adelaide - AUSTRALIA

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One thing is for certain, the new pressurised fuel delivery system on the HZ-R looks like a cleaner setup than what the YS's currently offer especially as the carby on the YS's require the diaphram interface block.

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02-09-2010 01:38 PM  8 years agoPost 15
snowman999

rrNovice

nottingham

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One thing is for certain, the new pressurised fuel delivery system on the HZ-R looks like a cleaner setup than what the YS's currently offer especially as the carby on the YS's require the diaphram interface block.
True! will be lot easier to change liner and ring on OS by this way,since you just need to unscrew the neck and take the whole carb out in one piece before you heat up the bore,less then ONE minute it's done.

Compare to YS,disassemble the carb and put them all together could be a risk.

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02-09-2010 02:12 PM  8 years agoPost 16
Avropilot

rrVeteran

Murfreesboro, Tennessee

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It's a great thing that OS listened. They are making a good run here lately at taking over the heli engine market. It's the fastest growing section of the RC market.

Waiting for parts

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02-10-2010 12:46 AM  8 years agoPost 17
knightofcarnage

rrElite Veteran

chicago

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So is there a one-way valve?
or is it build in.

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02-10-2010 01:39 AM  8 years agoPost 18
Santiago P

rrProfessor

South West, Ohio

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It is also unknown at this time, but apparently O.S. will sell the carb by itself, so that it can be installed on any O.S. 91 HZ motor or even on an Align H motor."
One can only hope. We could keep buying moded Carbs from OMI, but this would be a better alternative.

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02-10-2010 02:48 AM  8 years agoPost 19
blade3d

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New Jersey USA

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And the 55 ???

Blade3d

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02-10-2010 06:11 AM  8 years agoPost 20
FlytilyaDrop

rrVeteran

Playboy mansion

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Pretty, but Im gonna stay with my YS's.
Congrads OS.

This hobby sucks, when your not flying.

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