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Heli-Max . Scorpion Power System . Ron's RC Helicopters
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Gasser Model RC Helicopters

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Honda 26cc Four stroke gasser + bits from the shed

JCT

Senior Heliman

Scotland

Started this a few months ago , it`s made up of mainly Kalt gasser parts , flys very well but no 3d stuff (vid to follow) unfortunetly I need a new main shaft Kalt Alpha (see photo)any body out there got one for sale





01-16-2007 Over year old.
Toadster25

Key Veteran

Iowa

That is very cool. I wish that someone would make a 4 stroke gasser heli unless it doesn't actually work very well like, little power and vibrtion problems over heating? The best way to find out is try I guess. I would like to see a video and let us know how it goes.

01-16-2007 Over year old.
copperclad

Elite Veteran

NY

hi JCT
thanks for posting , super cool project , i would love to hear it run , the four cycle must sound fantastic, keep us posted , thanks again , dana

01-17-2007 Over year old.
flipped2left

Key Veteran

indianapolis,in.

depending on the diameter and the length.. you could use one of those stainless steel rods out of an old printer. just cut to length and drill your holes.

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

01-17-2007 Over year old.
avator

Veteran

New Jersey

JCT,
Great project. I love 4 strokes. How's the power? Looks like your main rotor shaft has the pitch change rod that goes to the washout mixer through the slot in the shaft. If you can't find a Kalt replacement you might be able to use a shaft from a MA Superior as that has a slot as well. Depends on the length I suppose.

01-17-2007 Over year old.
JCT

Senior Heliman

Scotland

The power is good althought it does vibrate a bit more than a normal gasser . I think I have made a mistake in using the Kalt mechanics as it seems to be very hard and expensive to aquire any gasser parts. It might be back to the drawing board to try something else . The rotor shaft has a slot in it , as you can see from the picture , which means that a shaft from other makes would not do . If weather permits I`ll take a video of it flying/shaking this weekend and get it posted

01-17-2007 Over year old.
MadCityMan

Senior Heliman

Madison, WI

That thing is awesome! How much does it weigh and how many RPMs in order to hover?

Dood, no way!

01-17-2007 Over year old.
HOMEPAGE  
JCT

Senior Heliman

Scotland

Never wieghed it but it is heavy , the engine speed is governed @ 9000rpm with a revlock and statorgator which gives a head speed of 1300 rpm

01-17-2007 Over year old.
JCT

Senior Heliman

Scotland

Sorry about the quality but it lets you here the sound of the engine .

01-17-2007 Over year old.
HELI3DFLYR

Senior Heliman

Hamilton, Ontario, Canada

Cool project Honda Motors are hard to kill, it would be great if there was a gasser available for them.

MinAir 1005SE Gasser, Align T600E, T500E GF, 450SE V2

01-17-2007 Over year old.
Dood

rrProfessor

Wescanson

Most heli's are made in Japan as it is, but Dude! You took the term "Rice Burner" to a whole new level!!!

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01-18-2007 Over year old.
GASMAN

Heliman

ROCKLEDGE, FLORIDA

Hughes 300c, Honda Powered RC Helicopter Build History

This is a purpose built document to provide technical info and history to those who are interested in my Honda powered large Hughes 300c scale helicopter.

Thanks for your interest,
Eddy THompson

Technical Information overview:

1. Canopy/tail boom/landing gear is a Robbe large scale Hughes 300c

2. Side frames were custom fabricated to adapt the Honda engine to basic Kalt Gas Alpha mechanics.

3. Tail rotor/gearbox is Kalt Gas Alpha adapted to the Robbe tail boom with custom made offset drive so that the tail boom is angeled up 6 degrees like the full size 300c.

4. Rotor head is custom made using parts from three different types of Kalt rotor heads. The damping of the flapping axis is accomplished using the flex plate from the Kalt flexplate head K4SB. The blade grips are from the Kalt all metal black head.

5. The main drive gear ratio is 9:1(10 tooth pinion and a 90 tooth main).

6. The measured head speed is 1000 rpm, so the engine rpm is 9000 rpm (9x1000=9000).

7. The main blades are 710mm semi-symetrical carbon fiber, weighing 195grams.

8. The engine is a Honda GX31 SA2 rated at 1.5HP.

9. The current weight with pilot and custom made cockpit interior is 21.5 pounds.

10. The machine flys very smooth, very docile, and very predictably.The power is adequate to acheive scale flight and hover OGE on a 85 to 90 degree day with high humidity.

11. The main rotor shaft is 10 mm x 250mm long and the two support bearings are 60mm apart. The center of the upper bearing to the rotor head bolt is125mm. Bearing block width is 21mm (between side frames).

I spent about 3 months developing the basic pod and boom machine until I got the engine running its best and determining the best gear ratio. Once that was done, I started the custom adaptation of the Honda engine/mechanics/Robbe Hughes 300c fuselage kit.

I fly a single stick radio which I converted from a dual stick. I have
converted several radios to single stick over the years.

You can see many photos of the mechanics, the heli and the single stick by clicking on the
following site:

http://www.scalerchelis.com/g2/main...-TOYS-AND-JOYS/


Eddy Thompson

01-18-2007 Over year old.
JCT

Senior Heliman

Scotland

Nice job Eddy , I take it the engine is the old push rod model as it looks different to mine . The Honda I used has a belt driven o/h cam and punches out just under 2hp , the pinion gear is 13t with main at 88t hence the higher head speed . I used the all metal Kalt black head which is really stable but have noticed a distinct delay in controls , this is mark 1 with my ultimate aim to go scale with a Bell 47 in mind .

Cheers
Colin

01-18-2007 Over year old.
GASMAN

Heliman

ROCKLEDGE, FLORIDA

Hi Colin,
I used the GX31 (1.5 hp) which was a gear driven cam. At the time, the smaller version was the GX22 (1 hp). If I would now go to the GX35, my machone would really have much more power. I love the Honda engine, and would not go back to the 2 cycle engine again. I do however still have a flyable KALT GAS AALPHA on floats. You saw it if you went to my gallery on scale rc helis. At some point, I will convert the GAS ALPHA to Honda power.

Within the next two months, I will be starting the building of an UL MOSQUITO helicopter. That project will take most of my time.

Keep us posted on your on-going Honda projects. I've always thought the Honda sounded like a Bell 47.

Later,
Eddy Thompson

01-18-2007 Over year old.
raptor50luvver

Key Veteran

PE

Very nice,good work

01-18-2007 Over year old.
Inspector Fuzz

Key Veteran

NLA

Looks great.

I have been eyeing the motor on my Stihl pole pruner for just such a use. It too, is a small 4 stroke, though it runs on a 50:1 2 stroke fuel. It sounds the same as the honda. Very pleasing.

What I want to know is why hasn't TOM FIDDLER done this??
After pioneering the Predator Gas this ought to be a piece of cake.
Maybe I should send Tom the motor from my Stihl pruner?
JEFF

01-18-2007 Over year old.
gmpland999

Heliman

Flower Mound, Texas USA !!

Jeff -


I had the same idea, but with a weed whip engine...

Shindiawa makes on heck of an engine and it is fun to fly ..

Check out my gallery pics

JCT - nice looking heli, and it sounds great to ...

If it spins you will break it !

01-23-2007 Over year old.
Inspector Fuzz

Key Veteran

NLA

@gmpland

I checked out the pics. Pretty cool! I bet that baby is stable in a hover with all that weight down low like that.
JEFF

01-24-2007 Over year old.
JCT

Senior Heliman

Scotland

At last here`s a vid of the Kalt flying sorry for the quality but the daylight was starting to fade

http://www.youtube.com/watch?v=IUSkZtg9MjE

02-23-2007 Over year old.
copperclad

Elite Veteran

NY

hi JCT
great video! , super project , i love the sound it has when it spools up and flies , thanks for posting , i am starting to get four cycle fever , thanks again , dana

02-23-2007 Over year old.
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Gasser Model RC Helicopters

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Honda 26cc Four stroke gasser + bits from the shed

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