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HelicopterMain Discussion › Gas vs nitro
08-09-2007 07:38 PM  10 years agoPost 1
Furious Predator

rrProfessor

Kitchener, Ontario,​Canada

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this is something i have come to notice recently....

gas power rc planes/heli's/cars which run on gasoline....run incredibly efficient compared to nitro powered machines, but still produce amazing amounts of power...

why is that?

example, my Century Predator gets a runtime of 10-15 minutes depending how im flying it. a predator gasser would get what...45 minutes?

my friends RC Buggy gets well over an hour run time on a tank. as with a friends gas powered plane.

so why are we using nitro? gas engines are cheaper to run and far less messy.

Shawn
Team Leisure-Tech
Team HelixRC

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08-09-2007 07:41 PM  10 years agoPost 2
shuttlepilot

rrElite Veteran

Mullins, South​Carolina

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One thing for sure is the power to weight. Gas engines are much heavier than their nitro brothers. A 90 size heli is lighter and just as, if not more powerful than my 26cc gasser. The gas does produce more tork...but there is more to performance than just tork.

Gas is Great
Camper Fuel is Better!!
QWW Helis

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08-09-2007 07:46 PM  10 years agoPost 3
Furious Predator

rrProfessor

Kitchener, Ontario,​Canada

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yeah...i know they are beafier engines....but none the less. a big gasser will go through less fuel in volume then a smaller nitro machine would...is it that the nitro's run at higher RPM? i have no idea what a gas engine's rpm would be.

Shawn
Team Leisure-Tech
Team HelixRC

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08-09-2007 07:57 PM  10 years agoPost 4
shuttlepilot

rrElite Veteran

Mullins, South​Carolina

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I think the rpm has some to do with it also. An OS 91 produces 3.3 hp (According to OS) with a top rpm of 16,000. My G26 produces 2.6 hp with 12500 as a max rpm. The 91 does this in a smaller more lightweight package. It is known that glow engines are terribly inefficient, but it's that raw hp that overcomes efficiency woes.....

Edit. The G26 weighs in at 56oz, while the OS 91 is only 21.3

Gas is Great
Camper Fuel is Better!!
QWW Helis

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08-09-2007 08:24 PM  10 years agoPost 5
Tommy Z

rrKey Veteran

Lubbock, Texas

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Yeah

I think I posted a similar question a while back. I was wondering exactly what you were. (I'm not saying you should have searched or anything). But I think you got a few more replies than I did

-Tommy Boy

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08-09-2007 08:49 PM  10 years agoPost 6
jschenck

rrProfessor

La Vista, NE.

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Gasoline has a much higher energy content than alcohol. That's why you burn so much more alcohol than gasoline for a given task. Also you have to mix alcohol at ~7:1 with air for proper burn where gasoline is ~15:1 IIRC.

This is why cars get slightly less mileage burning E10 gas vs. straight gas. My neighbor has a truck than can burn E85 fuel but won't touch it because he says he can actually watch the gas gage move down, like 50% less mpg.

A third component is the amount of oil in the fuel. 2-stroke gasoline as (?) 3oz/gal. of oil vs. 20% oil in our glow fuel.

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08-09-2007 08:52 PM  10 years agoPost 7
Furious Predator

rrProfessor

Kitchener, Ontario,​Canada

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ah, ok, i understand now. thanks.

Shawn
Team Leisure-Tech
Team HelixRC

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08-10-2007 09:09 PM  10 years agoPost 8
SuperSixTwo

rrVeteran

Virginia City, NV​---USA

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"a predator gasser would get what...45 minutes?"
I dont know about a Century, but my MA gasser gets 11-12 of Hover time on 10 or 12 oz tank. It is running a little fat due to the new motor (G231) but is sure isnt anywhere close to 45! Would be fun to convert to glow and run the 30% thru it! But then again, i better get a bigger tank!

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08-10-2007 09:30 PM  10 years agoPost 9
shuttlepilot

rrElite Veteran

Mullins, South​Carolina

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I'm running a 20oz in mine with a G26. I can get at least 25min.

Gas is Great
Camper Fuel is Better!!
QWW Helis

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08-11-2007 01:34 AM  10 years agoPost 10
Butch

rrVeteran

New York

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pound for pound...gasoline is about 10,000 times more explosive than TNT!

The Whirlybug Bit Me!

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08-11-2007 01:45 AM  10 years agoPost 11
GyroFreak

rrProfessor

Orlando Florida​...28N 81W

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6 nitro flights 1 hr airtime or $25 cost of operation. 4 gasser flights = 1 hr airtime. Cost is 4/14*4 = $1.15 or savings of $23.85 per hour of enjoyment. Adds up quick for the rainy day!
The above was from Raja on another thread.
Fuel costs:
1 hour on gasser = $1.15
1 hour on equiv size nitro =$25

I'll edit this later and include a link to the thread if you want to see how he came up with these numbers.

Here it is:
http://www.runryder.com/helicopter/t365357p2/

I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?

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08-11-2007 04:56 AM  10 years agoPost 12
uragem

rrApprentice

Indianapolis, IN -​USA

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Gas STINKS up the place!

Indy Jeweler

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08-11-2007 05:05 AM  10 years agoPost 13
shuttlepilot

rrElite Veteran

Mullins, South​Carolina

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Gas STINKS up the place!
Yep, Smells like saving 20 bucks a gallon!!!!

Gas is Great
Camper Fuel is Better!!
QWW Helis

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08-11-2007 05:07 AM  10 years agoPost 14
GyroFreak

rrProfessor

Orlando Florida​...28N 81W

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I use camping fuel. No smell, at lest to me and many others here on RR...
Yep, Smells like saving 20 bucks a gallon!!!!
Good one..LOL

I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?

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08-11-2007 08:08 AM  10 years agoPost 15
Helinutnz

rrElite Veteran

below 42 South

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Burst the tank and ignite it on gas and "whooomph" Makes for a nice heli barbeque.
Never seen a nitro one catch on fire yet.
Not a primary concern.
Also have you felt the vibes from one of those gas engines? I had a few in large planes over time and they sure do vibe the airframe. They are heavy and HP per pound is way lower than nitro. I have never seen a gasser fly anything like a top end 3D nitro machine.

Sure it has merit. I'd love cheaper fuel. The electrics have awesome performance now but you pay for it with batteries and esc's. I looked into it and I cannot see my way into buying these huge batteries etc just yet. Seen a few nice smoke up videos with those thing too.

Nitro for a while yet me thinks......

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08-11-2007 09:02 AM  10 years agoPost 16
flipped2left

rrKey Veteran

indianapolis,in.

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I love my gasser! 40 mins flying time on mine, it's an older J.R. Z230 with the zenoah 23cc eng., just fill 'er up take it and radio to the field.

Smile! people will wonder what you're up to!!

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08-11-2007 10:00 AM  10 years agoPost 17
DJDAZ

rrVeteran

Perth Western​Australia

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I love idea of a gasser - loads of cheap run time, fit an alternator so u don't even need to charge batts. Take a few tools to the field and some spare gas if u need it. Pull the cord and you're flying for ages.

The reason I haven't got one is the price. It will cost me $4000au to get one up and that's with the G231 Zenoah, pipe and basic electronics.

Since researching the price i have also asked a few people and most of them have had too many drama's with vibration and RF interference to make me part with the cash.

Plus we all know the a 90 will rip-snort a gasser in the whole "which one 3D's better" argument. As inefficient as a 90 is in comparison I'm on the same side of the fence that say's I've never seen a gasser flown as hard as a 90.

I could use the RX, batts, 9252's, 9254 + 401 out of my Raven 50 and put it in a blinged Raptor 90SE with pipe and pumped OS91 for an in the air price of $2000.

Truth is that once someone invents a vibration free gasser that lacks the RF issues that seem to appear, I'll be more willing to blow the $.

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08-11-2007 10:36 AM  10 years agoPost 18
shuttlepilot

rrElite Veteran

Mullins, South​Carolina

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I could use the RX, batts, 9252's, 9254 + 401 out of my Raven 50 and put it in a blinged Raptor 90SE with pipe and pumped OS91 for an in the air price of $2000.
I've got less than 2k in mine...and I bought new 9252's and a 401 with 9254. Also built a generator and still haven't got to 2k yet.
Since researching the price i have also asked a few people and most of them have had too many drama's with vibration and RF interference to make me part with the cash.
I've never had an issue with RF. I run a PCM system. They do have more vibration, but with preflight and postflight that I perform on any heli that I fly...that also has been a non-issue.
Plus we all know the a 90 will rip-snort a gasser in the whole "which one 3D's better" argument. As inefficient as a 90 is in comparison I'm on the same side of the fence that say's I've never seen a gasser flown as hard as a 90.
I've seen a vid of Curtis flying a Predator that was pretty impressive. Let's face it, yes a gasser is not going to bang around like a 90 ship, but honestly, how many folks out there can really fly a 90 to it's full potential like the "pro" pilots do? Wizbang 3d is not the "end all--be all" of heli flying.....but to each their own and that's what makes folks individuals.

Of course....I like nitros too...

Gas is Great
Camper Fuel is Better!!
QWW Helis

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08-11-2007 03:27 PM  10 years agoPost 19
GyroFreak

rrProfessor

Orlando Florida​...28N 81W

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Take a few tools to the field and some spare gas if u need it. Pull the cord and you're flying for ages.
WHOOPS, ya forgot the transmitter mate, no flying for you today !!!

I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?

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08-11-2007 04:25 PM  10 years agoPost 20
w.pasman

rrElite Veteran

Netherlands

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As said the gas engines are relatively large to get some power.
Large helis are much more expensive than small ones.

Someone at our field had a gasser. It was so expensive that he hardly dared to fly it. He crashed twice and each time the repairs were in the same price order as a complete new 50 size machine including everything. A good 50 size engine already has 1.8hp which is pretty close to the smaller gas engines.

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HelicopterMain Discussion › Gas vs nitro
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