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ProModeler Scorpion Power
HelicopterMain Discussion › Best endurance gasoline heli?
04-15-2017 08:20 PM  41 days agoPost 1
Santiago P

rrProfessor

South West, Ohio

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Looking for the best endurance gas heli per ounce of fuel

S

Team Minicopter - PeakAircraft.com
bavarianDEMON- Team Kontronik - Scorpion Motors-

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04-15-2017 09:32 PM  41 days agoPost 2
fastflyer20

Key Veteran

N. Tonawanda, NY

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Much more a function of head speed, gear ratio and engine selected. You can fly a low time of 6 minutes on 14oz at 2100 HS with a Toxic vx300 or probably run 20 minutes plus with a 270 at 1400-1600 HS. A 240 would get even better economy, keeping in mind available power decreases quickly. Add additional tank for more capacity. Any payload requirements? Any flight characteristics more than docile FF? Any target flight time?

Carey has a conversion available for the Agile that has a TT as well as the Whiplash V2 soon to be released. Due to many design changes, the Whip has yet to proven. A Synergy 766 conversion is now available if a large payload was the objective.

While it is my favorite, I suspect the Goblin with all belts may consume a bit more fuel.

Tom
CAUTION - my posts are based on my experiences, yours may be different.

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04-15-2017 11:13 PM  41 days agoPost 3
Santiago P

rrProfessor

South West, Ohio

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The goal is to maximize endurance with a fixed amount of fuel, and a nominal minimum weight, (say 12lbs?)
In one word, efficiency

Team Minicopter - PeakAircraft.com
bavarianDEMON- Team Kontronik - Scorpion Motors-

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04-16-2017 01:33 AM  40 days agoPost 4
Heli_Splatter

Elite Veteran

Silver Spring, MD by way of Sidney, Ne - USA

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I don't think that you really have a lot of choices in gas powered helis to get too specific.

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04-16-2017 03:35 AM  40 days agoPost 5
Santiago P

rrProfessor

South West, Ohio

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I'm just trying to get a baseline. Tom posted pretty good info. Numbers like those will help me get a feel for what current gas models perform like and what could be the next step

Team Minicopter - PeakAircraft.com
bavarianDEMON- Team Kontronik - Scorpion Motors-

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04-16-2017 10:24 AM  40 days agoPost 6
PaulBowen

Veteran

East coast Australia.

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My JR GSR260Z FBL Sport is an 26cc 800 that gets an easy 30 minutes although I'm not sure of the tank size.

Futaba T18SZ, JR Propo XG14, Hirobo fanatic!

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04-17-2017 02:21 AM  39 days agoPost 7
Gearhead

rrMaster

Vt

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the lightest 30 size gas heli is the Century 30, but you will have to buy it used, they are not made "now"

Jim
Buzz Buzz Buzz

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04-17-2017 04:40 PM  39 days agoPost 8
Santiago P

rrProfessor

South West, Ohio

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Could a GAUI GX4 be stretched easily, and make to run 700 blades at much lower RPM? (Like 1000 RPM)

S

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04-17-2017 05:37 PM  39 days agoPost 9
Pistol_Pete

rrProfessor

Seffner, FL

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Can you stretched a 400 class heli using a 10cc engine spinning 425mm blades to 700mm blades?

You must be joking.

~~Enjoying the hobby one flight at a time~~

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04-17-2017 05:52 PM  39 days agoPost 10
RM3

Elite Veteran

Killeen, Texas - USA

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GX4 to 800? sure you can... you didnt ask if it could fly though...

BUT you could stretch it to say 600... gear it way down, run the head at 1300, speed the tail up to keep tail authority, and still consume the same fuel (.8 per minute) to keep it flying. but how well who knows... would need custom gearing which is $$$ not to mention the CG change you would have to address.

I had plans on a stretched Radikal... a 20cc engine to 800mm blades running a low headspeed of about 1200... light weight yes, but it would be any fun to fly?... basically an under-powered 800 even with one of my modded engines.

showing a preference will only get you into trouble, 90% of everything is crap...

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04-17-2017 06:05 PM  39 days agoPost 11
Santiago P

rrProfessor

South West, Ohio

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Thanks RM3,

The re-gearing would be the challenging part for me, and yes, stretch to 600 would be more sensible.

I am not talking about making another 3D heli, but one that could fly around a long time with very little fuel.

S

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04-17-2017 06:22 PM  39 days agoPost 12
Heli_Splatter

Elite Veteran

Silver Spring, MD by way of Sidney, Ne - USA

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This is all about power vs. weight trade-off. In my opinion, you would want a reasonable amount of fuel aboard (let's say 15-24 oz). Right there means a larger helicopter. Then there is the weight of the engine...Zenoah G26 or so... well, we have to be talking 600 size or larger.

I knew the guy that flew an RC airplane across the Atlantic. He did it with a 4stroke 60size glow engine using white gas. Coleman fuel.

This kind of problem is a delicate balance. More weight, more fuel, more power. So you really have to start with size of aircraft you think that you want, and start the testing around that airframe, rotor speed, fuel on-board. With these tiny gas engines, who knows what is possible... you design around the engine.

It sounds like you are looking to spot border problems.

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04-18-2017 01:56 AM  38 days agoPost 13
Santiago P

rrProfessor

South West, Ohio

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Thanks Splatter,
I have done small engine work with 4 stroke engines based on Maynard Hill 's across the Atlantic efforts, using the same C & H ignition, special synthetic oil, modified Surpass engine and hand carved propellers.

Many of you may be asking why am I asking these questions...

The answer is I'm trying to inject FUN in new heli events

Santiago
MHSFA

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04-18-2017 02:29 AM  38 days agoPost 14
Magnumeng

Veteran

29 Stumps, CA

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I remember years back that Maryland had a funfly and one of the contest was to take a STOCK bird and see who could fly the longest. I do not remeber all the rules, but it was a blast to watch them start falling out of the sky after about 8 minutes...

TDR, Kontronik Kosmik Cool 200, Kontronik 750-56, CGY750,
Team KBDD

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04-18-2017 02:15 PM  38 days agoPost 15
Richardmid1

rrProfessor

Leeds, England

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Does it have to be gasoline? What about electric, I think they can go for 30 mins?

60% of the time, it works every time!

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04-18-2017 03:53 PM  38 days agoPost 16
gwright

Veteran

Champaign Il

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yes, easily if just hovering around

Gary Wright
Futaba
Flightpower
Prod manager at Hobbico

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04-18-2017 04:16 PM  38 days agoPost 17
fastrc1

Key Veteran

Brooklyn, NY-USA

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Magnumeng. I won that event once with a shuttle Z. Belt start and Enya 35.

RIP Roman Pirozek Jr.
Team SRW Comp
Zeal Blades U.S. Flight Team
HRP
Team CanoMod

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04-18-2017 04:44 PM  38 days agoPost 18
revmix

Key Veteran

NJ

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if just hovering around
takes more energy than forward flight (ETL)

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04-18-2017 05:21 PM  38 days agoPost 19
ICUR1-2

Elite Veteran

Ottawa, Ontario

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long flight times

this is where I miss the 30 size nitro, my old hawk pro could get close to 15 minutes with the 50 size fuel tank.

spending time, paying attention

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04-18-2017 06:04 PM  38 days agoPost 20
Chris Bergen

Elite Veteran

cassopolis, MI USA

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We can go for up to 3 hours Santiago...

Chris D. Bergen

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