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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › OS 37 fuel consumption
01-18-2010 07:59 AM  8 years agoPost 1
Aaron29

rrProfessor

USA

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Hi,

I looked at some posts and reports showed that the O.S. 37 gets poor fuel economy. Is this still true, or was it a tuning issue for people breaking in the motor?

You'd hear ridiculous losses of fuel economy...stuff like runtime on O.S. 32, 30 mins. Then same heli runtime on O.S. 37, 12 mins!

I'd expect about 20% more fuel consumption not 250%!

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01-18-2010 08:08 AM  8 years agoPost 2
naked painter

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Mid glamorgan uk

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Something wrong there.

I used to get 20mins on my Irvine 36H.

What size tank are they using?

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01-18-2010 08:40 AM  8 years agoPost 3
Aaron29

rrProfessor

USA

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What size tank are they using?
Don't really know but more than one person from more than one type of heli reported similar reductions in flight time.

Stated explanations were "you get more power, so it burns more fuel."

I just have to wonder how the 37 is burning so much more than the 32. It's only 15% more displacement. Where is all this gas going?

While I can appreciate more power, I'd like to be able to have a heli that sips the fuel the way the old .32 used to. The OS 32 was down on power but it was a truly economic engine. When power without concern for fuel is needed, I'll just fly a 50!

If O.S. was still making the 32 I'd have gotten it instead of this 37. Nitro is expensive and I want an engine that sips it again.

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01-18-2010 08:52 AM  8 years agoPost 4
LonR

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Macomb,Mi

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This was my old Raptor 30 with a OS 37 running 15% powermaster.

Watch at YouTube

Watch at YouTube

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01-18-2010 08:55 AM  8 years agoPost 5
Aaron29

rrProfessor

USA

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Did you notice a big increase in fuel consumption compared to the 32?

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01-18-2010 09:05 AM  8 years agoPost 6
LonR

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Macomb,Mi

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I really didn't.These videos were taken my 3rd month in the hobby so my throttle curves were off a little but the tune was good,all I really noticed was the power.Each flight the tank was full then empty at the end,thats with a header tank too.Heres my OS 32 which was a little rich but not enough to knock a major amount of flight time off.

Watch at YouTube

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01-18-2010 09:08 AM  8 years agoPost 7
Aaron29

rrProfessor

USA

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It's good to hear you didn't notice a big fuel consumption increase. I'm hoping that the gas-guzzler reports were just guys breaking engines in and thus were too rich. I did a search and overwhelmingly the posts were showing the little 37 to be a big gas hog compared to the 32.

I bought the 37 to save on gas over my 50. Too bad the 32 isn't an option anymore.

If you're like me, you fly 5 times on Saturday, then 5 on Sunday, you easily go through 40 flights in just a month.

People don't realize that nitro is going to be your biggest expense in this hobby. If you fly 40 times, the cost of the fuel during that time exceeds the cost of a crash. That's with a 30. With a 90 it's more like 50 flights (of course you're talking about a lot more money in gas/crashes, but the cost analysis remains the same.) Not sure why people don't consider fuel consumption to be a big deal. If I told you I crashed every month you'd probably think I was spending a lot, yet that's what we all spend in fuel a month if we are regular flyers.

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01-18-2010 09:27 AM  8 years agoPost 8
LonR

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Macomb,Mi

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Yea the OS 32 and OS 37 are about the same on gas but the OS 37 makes a very noticeable amount of power over the 32.You'll be very happy with the 37,its a easy to tune motor and makes good power for its size.If I knew what I know now when I had that heli and motors,im sure I could of got another min or so out of them.I ran both motors at 185F between the head/block with crappy throttle curves,it would over speed inverted lol.If I had good throttle curves or a gov and ran the motors at 195F I could get another 1 1/2 - 2 mins .Running them a little rich with the over speeding just used more fuel.

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01-18-2010 11:35 AM  8 years agoPost 9
Hamo

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Ireland

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This topic was covered before in a thread I started.
https://rc.runryder.com/t384591p1/
To follow up, my OS37 is not as thirsty now as it was when new.
Hamo

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01-18-2010 11:39 AM  8 years agoPost 10
Aaron29

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USA

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How would you say it is now? 20 mins, 25?

I'm skeptical of all good news because your post is one of many that showed the 37 to be a gas guzzler.

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01-18-2010 11:59 AM  8 years agoPost 11
Mike545

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gettysburg, pa

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wait till you get a .90,,

"always feel thankful..... never entitled"

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01-18-2010 12:07 PM  8 years agoPost 12
Aaron29

rrProfessor

USA

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I have a 60 and have seen enough.

I'm actually going BACK to the little ones to save operating costs.

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01-18-2010 12:15 PM  8 years agoPost 13
Hamo

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Ireland

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How would you say it is now? 20 mins, 25?
I haven't actually timed it since but I would guess 15-20 minutes.
When I first started using the 37 after the 32, a few minutes into the flight and I noticed the fuel level in the tank a lot lower than before. So I thought I had a leak, but no, the 37 is noticeably thirstier than a 32. With a 32, I often got over 30 minutes.
Hamo

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01-18-2010 12:17 PM  8 years agoPost 14
Aaron29

rrProfessor

USA

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I would guess 15-20 minutes
Still a bit disappointing. I was hoping for only a 20% loss in flight time. It should be like 24 mins.

You are only getting 50% - 66% what you used to get.

I had a 32 that died and would have replaced it with the 32, but the 37 was all there was.

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01-18-2010 12:23 PM  8 years agoPost 15
Hamo

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Ireland

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I know what you mean. It could be that a more powerful engine is able to maintain higher head speed (sustained higher RPM) therefore use more fuel.
Hamo

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01-18-2010 12:31 PM  8 years agoPost 16
Hamo

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Ireland

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01-18-2010 12:53 PM  8 years agoPost 17
naked painter

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Mid glamorgan uk

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I had thought about going back down to a 37 from a 50, not too sure now..

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01-18-2010 12:58 PM  8 years agoPost 18
Busher

rrKey Veteran

Manchester, England

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I originally noticed a change in consumption on my Raptor 30. As everybody said the running in process was quite rich and used a good gallon before I was able to lean in the needle.
The OS 37 was thirstier than my tt39 were on 15% nitro I was getting around 25 mins with the OS i'd say about 15-17 mins before I decided to land on header tank.
I also noticed that the OS and the TT required to be set slightly rich on set off and as the tank leaned out the engine leaned with it. SO setting off rich was affecting my fuel consumption. I am a regular flyer but at that time wasn't that interested in fuel costs as I factored them in to my hobbies expenses.
Then I got the privileged chance of trying out a Carb smart from CSM, Now I was able to lean in the needle and if the engine showed signs of heating the carbsmart took over and richened the needle slightly, however as soon as possible it returns to the original settings.
This returned a slightly better fuel economy than my original setup with the TT39.
Well pleased

Good luck
Busher

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01-18-2010 01:11 PM  8 years agoPost 19
Rotowerkz

rrApprentice

Windham, NH

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I have an OS .32 SX-H in my Raptor 30. I could get about 15 min/tank with it. This is with the larger V2 tank and a 2 oz. header tank.

I recently swapped out my OS .46 FX-H with an OS .50 Hyper in a Falcon SE. My tank time went from 12 minutes to 8. Both engines are broken in.
The OS .46 makes its best torque at a lower RPM than does the Hyper. Maybe, if you can find it, the .46 FX-H might be a better option for extending tank time.

Much has been written about the difficulty in tuning the .46 FX-H. However, my .46 is just fine. Maybe I got a good one.

I should also note that all of the times were with 20% CoolPower.

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01-18-2010 01:38 PM  8 years agoPost 20
liljalepeno

rrNovice

Dublin, Ireland

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For what it's worth, I was flying both a 30 Shuttle and 30 Raptor V1 on OS .32's. I used to get:

Shuttle 30 mins
Raptor 18 mins

When I changed to OS .37's in both my flight time dropped down to :

Shuttle 22 mins
Raptor 11 mins

It was definatley worse during break in but onece a gallon or so was through each engine, they got better and flight time increased to what I noted above.

With the cost of Nitro these days, I have gone electric in both the Shuttle and Raptor now.
I still keep a couple of nitro birds (Nexus and Xcell 30) running on OS .37's (from the Shuttle and Raptor) and I take them out from time to time. The OS .37 performs flawlessly, just not as easy of Nitro as the .32's.

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