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HelicopterCentury Radikal G20-30 N640 Hawk Predator › O.S. .32 SX-HX Ringed Engine with Pull Starter
11-06-2007 06:59 PM  10 years agoPost 1
thelane

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Edmonton, Alberta Canada

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Anyone using this engine in their Hawk?

Does anyone have this engine AND an OS37? What's the power difference between them, is it noticable?

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11-06-2007 07:46 PM  10 years agoPost 2
mcfast

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Quebec Quebec Canada

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"What's the power difference"

Alot!

Get the 37!

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11-06-2007 07:55 PM  10 years agoPost 3
thelane

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Edmonton, Alberta Canada

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I doubt it is that much based on the specs

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11-06-2007 08:28 PM  10 years agoPost 4
bigdad390

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East. Liverpool, Ohio

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Yes, the OS.37 has more power and drinks a lot more fuel. That said, The pull start works better than I ever expected. I just give it one or two pulls and the engine starts. 80% of the time it starts on the first pull. With the pull start, I only take my heli, TX, a quart of fuel and a glow plug battery with me. No starter, starter battery or heavy flight box to carry.

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11-06-2007 08:33 PM  10 years agoPost 5
thelane

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Edmonton, Alberta Canada

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Cool. Ya, that's the attraction for me. I'm thinking if I put an OS .32 w/Pull-start in and an Align 2 in 1 w/lipo, all I need is the heli and fuel at the field.

I don't fly 3D stuff. I just buzz around.

~Lane

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11-06-2007 11:38 PM  10 years agoPost 6
oldfart

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Vancouver, Canada

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If you are just into FFF and basic Sport 3D, then any of the OS32SX engines will do (note. this pull start version is also a couple of oz. heavier then the standard version).

But there is a substantial difference in the 37 compared to the 32. The specs do not give torque figures - and this is where the 37 really aces the 32. The 37 has much better torque at the higher rpm's that we generally operate at.

But both engines will benefit a lot from a good tuned muffler like the new CN3037

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11-07-2007 12:09 AM  10 years agoPost 7
thelane

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Edmonton, Alberta Canada

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Thanks!

Define "basic sport 3D". Would that be a loop and roll, maybe a little inverted hovering?

~Lane

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11-07-2007 01:48 AM  10 years agoPost 8
cassat

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Alberta,Canada

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Oh Man....and I thought you were holdin out for that new Raven that was just bein released !

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11-07-2007 01:48 AM  10 years agoPost 9
oldfart

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Vancouver, Canada

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Yes - and with proper collective/cyclic management, even flips and bigger funnels etc.

For fast cyclic, one needs head speed. Head speed is the biggest consumer of power. (If you want proof, set up a throttle/pitch curve that will hover at 1550 and another at 1850. If you flew a tank of fuel of only hovering at 1550, you would get a lot longer flight then one of hovering at 1850.) So if you want to crank your head speed up on the Hawk, to say 1850, then you may only be able to pull 8 degrees of collective in an all out climb without the head speed bleeding off.

And with 6 degrees of cyclic for fast maneuvering, you will have to be sure that you are not combining much of the two through any maneuver. Otherwise, too much of the head speed will bleed off rather quickly. NOTE: also, the less power/torque you have available to you, the longer it takes to get that head speed back afterwards.

But hey, we did some pretty good 3D on the Hawk with the OS-32 for years before the OS37 or Toki 40's became available. Just as we did with 46 size helis, before the Hyper and YS-50's came along, or also just as we did with 60 size helis before we put 90's in them.

Until one starts doing maneuvers that consume a lot of power(those that require holding a fair bit of collective, cyclic and tail rotor all at the same time)then the OS32 will prove quite satisfactory.

Actually, the power difference I found between the OS32 and the OS37 (and even more so the Toki 40) on the Hawk, was about like what I found between the OS46 and Hyper 50 on the Raven and a 60/80 on the Predator.

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11-07-2007 02:07 AM  10 years agoPost 10
thelane

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Edmonton, Alberta Canada

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Oh Man....and I thought you were holdin out for that new Raven that was just bein released !
I'm ambitious. Well, I was going to write off the Hawk Pro, but it's too good to write off, I am going to get a Raven and fix this one up at the same time.
Yes - and with good collective/cyclic manegement even flips and big funnels.
Well, that's what I want to do. Get a .32 w/PS and use it while I build up the Raven.

~Lane

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11-07-2007 03:23 AM  10 years agoPost 11
mcfast

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Quebec Quebec Canada

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Why cant we get more Engine, with a Pull Starter!?
Where could I get a Pull Starter for my OS32 and how much ?

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11-07-2007 03:38 AM  10 years agoPost 12
thelane

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Edmonton, Alberta Canada

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I AGREE... why can't we get a pull-start for an OS37!!!

Here it is for the .32
http://www3.towerhobbies.com/cgi-bi...p?&I=LXCW03&P=7

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11-07-2007 03:56 AM  10 years agoPost 13
BronxDefector

rrApprentice

California, USA

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Go 37.....

Selling all my helicopters and gear...

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11-07-2007 04:14 AM  10 years agoPost 14
mcfast

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Quebec Quebec Canada

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Do I have to do any to the motor to put a pull starter on it ?

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11-07-2007 04:23 AM  10 years agoPost 15
thelane

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Edmonton, Alberta Canada

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Manual looks like a simple bolt-on job and that's it.

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11-27-2007 09:38 PM  10 years agoPost 16
CT.Chopper

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Meriden, CT

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you need the pull start crankshaft, backplate, one way bearing and the pull start assembly,

Its cheaper to buy a new .32HX pull start engine.

Rob Landry.

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11-28-2007 04:27 AM  10 years agoPost 17
SuperSixTwo

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Virginia City, NV ---USA

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Thelane, you get your motor yet?

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11-28-2007 05:15 AM  10 years agoPost 18
thelane

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Edmonton, Alberta Canada

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Nope, not yet. Gonna have to wait for Santa to bring me one I think

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12-02-2007 01:30 AM  10 years agoPost 19
newhackerflyer

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722

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37 PULL START
Hey.

does that 32 pull start fit the 37?

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12-02-2007 03:31 AM  10 years agoPost 20
Ravenhyper50

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Canada's Capital

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Thats what I would like to know

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HelicopterCentury Radikal G20-30 N640 Hawk Predator › O.S. .32 SX-HX Ringed Engine with Pull Starter
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