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HomeAircraftHelicopterPhotos and Videos › Flying my Raptor 60 V2 with TT70 gasoline converted engine
10-16-2005 09:26 PM  13 years agoPost 1
Raptorgasser

rrNovice

Sweden , City . Vansbro

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http://www.boppis.se/video/raptor_gasser_onboard.wmv

Flying with my gasoline converted raptor 60 v2. (car gasoline with 14% 2-stroke oil)
Not same power on gasoline as metanol/nitro but it is enough as my flying skill.

TT70 engine is tre time less than zenoah PUH231 but it works at you se in video

Flying 35-40 minute on 450cc fuel tank

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10-17-2005 12:41 AM  13 years agoPost 2
orlee008

rrVeteran

Miami, FL USA

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imaging the savings on fuel.... i would also like to see more

Hows the temp and rpms with this conversion?

orlee

Flying in Miami, FL (Kendall Area)

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10-17-2005 01:05 AM  13 years agoPost 3
Professorwiz

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Livonia, Michigan - USA

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I would LOVE to hear more. Where did you hear about converting to gas???????????

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10-17-2005 05:31 PM  13 years agoPost 4
Raptorgasser

rrNovice

Sweden , City . Vansbro

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Hi, folks.

im not godd englisch spelling but i hope you could understand what i write. Using swedish englisch lexikon.

Some history about me, i start flying heli in 1986-1987. My first heli Falcon 888. I never fly that time just hovering auround.

One year ago i buy my raptor 60 v2 and TT70 engine. After a cuple of flights i found out it could be very expensive With fuelcost, so i start to find out another way to fly cheaper.

I now a person in sweden build own electric ignition system to smaller radiocontrolled aircraft. the system name is "rontronic" see this link: http://www.westonuk.co.uk/run.html

I check with frends on swedish rc-forum: http://www.rcheli.se
and them dont belive i wos possible to use this system in helicopter.
no one in sweden has testing this in helicopter before. them told me, To use gas in smaller engine dont produse enough power to fly heli on gasoline. Them has wrong. see my video: http://www.boppis.se/video/raptor_gasser_grusgrop.wmv

I buy this system and start to install that i my heli. you can see som pictures i my gallery on runryder and in swedish forum.
http://81.8.136.43/phpBB2/album_per...bafed8a1678747e

it was wery easy to build this in, i have to fabric an holder to the sensor on engine. the sensor told the system the ignition point. I have a photo in my swedish gallery how i mont the sensorhold.

The swedish builder of this runtronic system build his own sparkplug and i burn this sparkplug after 1 hour flying. so i find better sparkplug on internet i us. se link: http://www.morrisonandmartin.com/sparkplugs.htm

and this sparkplug working wery wel.

My engine produse alot of heat running on car gasoline, that is my biggest problem whith this conversion. First i use 6% oil mix and after 6 hour flying my piston crack. The engine hawe not enough lubricationwit 6% oil. After that i use 14% oil mix (2-stroke oil) and no problem after that.

I still have small problem with the heat. The thread in muffler has broken a cuple of times depending on the heat make the aluminium weak.

Now i have purchase a zimmerman muffler build in stainless steel an that endure the heat better. ( i have not get this yet).

I have now flying more than 20 hour on my conversion and have no bigger problems.

My first attempt i use 98 oktan gasoline but i smell so mutch in my apartment so i running whit alternative gasoline, se link: http://www.aspen.se/Templates/standard1.asp?PN=108920

This fuel is 2.5 time more expencive than regular car gasoline but not smelling and have higher oktan, 102 oktan. so i use this fuel (seelink above) but in sweden it have another name, aspen race fuel.

In sweden model fuel with 10% nitro /15%oil cost $46 us /5 litre.
My aspen fuel cost $24 us /5 litre 14% oil (no nitro).

And i flying 3 time longer on aspen.

The nedle setting on carburetor. on model fuel 2.5 turn out and on aspen 1/2-3/4 turn out. The nedle setting was wery sensitive on aspen fuel, two snapp to lean or two snapp ritch its make the engine to lose power.

Performance.

Gear setting. engine 11T, rotor 93T (8.45).
rotor rpm: 1700 hovering

flying 35-40 minute on 450cc tank


The power is not enough to do hard 3D- flying but to practise, learning manoeuver, loop, roll, stallturn, backwards flying, inverted flying works wery well.

So now i flying cheaper when i start to learning backwards flying.

Now i has try to decribe abut my conversion, if you have more question i tray to ansver. ( may be little shorter letter).

I hope you ounderstan what i wrote.

Regards
Bengt Larsson

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10-17-2005 06:16 PM  13 years agoPost 5
orlee008

rrVeteran

Miami, FL USA

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thanks so much for the explanation and links... this is a very good and interesting mod, and it saves nitro fuel costs ($23 a gallon here)

I wonder how the engine would perform if you were to add a little nitro into the gasoline/oil mix. I have done this with my brothers gas scooter (zenoah G26 engine) and it seems to run faster and have a bit more power. Or maybe add those nitro pellets they sell at those scooter shops to increase the octane %

btw your english is just fine!

Thanks again,
Orlee

Flying in Miami, FL (Kendall Area)

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10-17-2005 06:51 PM  13 years agoPost 6
Raptorgasser

rrNovice

Sweden , City . Vansbro

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Hi. orlee008

The piont with this conversion is fly with low cost, so i dont try yet to pot some nitro in. here in sweden i pay $20 / 1 litre (1 qt) nitro.

I will test nitro in my gas/oil mix later.
you now, in sweden we pay high rate of taxation (32% of my income) and 25% of everything i buying. what i now it is ceaper tu buy things in US.

What type of fuel cost $23 a gallon in US. how mutch nitro in this fuel?.

What is nitro pellets?.
Is that suff same as STP booster you can have in the car to increase the oktane?.

Bengt

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10-17-2005 07:24 PM  13 years agoPost 7
orlee008

rrVeteran

Miami, FL USA

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well i wouldnt mind throwing in one gallon of nitro fuel into 10 gallons of gasoline if it means it'll cool the engine down a bit and help develop more power output for 3D and so on...

taxation here is roughly 23% of your income, depends on your income and what type of work you do and how much income you claim at the end of the year. Florida state tax is 7% on everything you buy.

30% heli fuel costs me $23 a gallon here. + 7% tax = almost $25 a gallon. 15% is around $16 but who uses that...

nitro pellets are little balls of some chemical that when you drop them into the tank (scooter) it increases the octane of the fuel a couple points. it creats more power but i've never used them before.. yeah its similar to the STP octane boost

orlee

Flying in Miami, FL (Kendall Area)

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10-21-2005 08:54 PM  13 years agoPost 8
Aron1

rrApprentice

Hungary

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HI!

It is amaising! Very interresting project!

In Hungary we are in the same situation with nitro...

Could you say some compare information about power? (For example
in percent... )

And congratulation for succesfull implementing.

Aron

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10-23-2005 06:25 PM  13 years agoPost 9
Raptorgasser

rrNovice

Sweden , City . Vansbro

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Hi Aron

it is wery difficult for me to compare the engine power.
I have only fly my TT70 on modelfuel. 10%nitro15%airosave oil75%metanol.
And gasoline mix 14%2-stroke oil 86%gasoline (aspen race fuel 102 oktane or super 98 oktane).

I think my engine produse 20-30% less power on gasoline.

I fly my Raptor with mixed curve trottle/pitch (pich -10 to +10 degree). i dont use govenor to control my rpm.
I have to fine tune my trottle/pitch setting.
I fly with SAB blade 680 mm weight 200gr

I have some more clip from my video above (i dont got this in the video above) there i do some quick climb from hovering. i can try to link to this sequense later.

I will sone produse more video on flying my raptor on gasoline. but i dont now excatly when. we are in winter season in sweden so i have only saturday and sunday to fly my raptor if wether is with me. After my work it is to dark to fly.
In my next video i try to fly more advanced flying. Litle harder flying.

So, when i has made my new video i send this in to this post.

Regards
Bengt

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10-23-2005 10:09 PM  13 years agoPost 10
Raptorgasser

rrNovice

Sweden , City . Vansbro

My Posts: All  Forum  Topic

Hi

Here is my link to the first 8 minute of my video i dont send in my first video above.

http://www.boppis.se/video/raptor_gasser_onboard.wmv

After i hover up i set down my heli depending on the engine run rich, two snapp turn in on needle every thing ok again.

I do three short quick climb without to lose rpm.
The last 8 minute is the same as i send in link earlier, without small frame from onboard camera.

Complete movielenght 16 minute.

Regards
Bengt

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10-25-2005 06:13 PM  13 years agoPost 11
Raptorgasser

rrNovice

Sweden , City . Vansbro

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Sorry. i have to cancel all my link to video. I will send my new address to my videolink when i got my new webhotel to work.

It will take a few days.

Regards
Bengt

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10-27-2005 07:36 PM  13 years agoPost 12
Raptorgasser

rrNovice

Sweden , City . Vansbro

My Posts: All  Forum  Topic

Working links to video
Now i got space on my webhotel.

New working links to video i have link to earlier.

Video with camera onboard.

http://boppis.se/video/raptor_gasser_onboard.wmv


Whole video from flight with raptorgasser.

http://boppis.se/video/raptor_gasser_grusgrop.wmv


Regars
Bengt Larsson

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10-28-2005 08:33 PM  13 years agoPost 13
Aron1

rrApprentice

Hungary

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Hi!

Great video!

Can I ask, what was the cost of the conversation completly?

Did you have problem with cooling, or did you use the original fan?

I am thinking to do this conversation on a 91 C-Spec.

Aron

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10-28-2005 10:23 PM  13 years agoPost 14
Raptorgasser

rrNovice

Sweden , City . Vansbro

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Hi Aron

The heat is my biggest problem, i use original fan on my TT70
I have try to use this converting on my TT90 and on my OS 91SX (TT90 and OS91 produse more heat than TT70).

so i find out it work best with my TT70. I think it depending on kompression (hops i spelling right). gasoline fuel dont like high kompression so if you dont put some more packing gasket to less kopression the engine fire in wrong timing. high kompression need high oktane more then car gasoline. In my TT70 i dont have midification my kompression (original).

Maybe i gone to tray more later with my OS 91SX to have it to run better on this ignition system.

The heat.
When i start to fly heli (on nitro fuel) frends told me, dont run engine hotter and you culd hold finger on backside engine 5 sec without to burn your finger.
If i hold my finger more then 2 sec i burn my finger.

On exhaustpipe i have to extend my connection with 1 inch for pressurehose so i dont burn hose

I have crack my piston once depending on running with less oil (6%) after i use 14% oil i have no problem. How long my TT70 will work on this heat i dont now but i have fly more than 20 hour on tis system now

If you will try to fly yor OS 91 on this system i recomended you to less your kompression whith two original cylinder packing. (two packing between cylinder cylinderhead).

Another problem is fuelhose, silicone dont like gasoline so you have to find another hose. but you can buy same as in predator gasser.
I use rubberhose from car vacuum system. it will be hard after two week
so i have to put some new hose in tank. or buying from ricks i us.

The cost

Ignition system inklude battery (lipol 1 cell 3.7v)
200 us $ (1600 swedish krona)
sparkplug 17 us$ each from http://www.morrisonandmartin.com/sparkplugs.htm

I will add some more picture in my homsite on my installation.
http://www.boppis.se/flygsidor/mode... modellsida.htm
only on swedish , sorry.

regards
Bengt

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10-28-2005 10:49 PM  13 years agoPost 15
Raptorgasser

rrNovice

Sweden , City . Vansbro

My Posts: All  Forum  Topic

I forget to explain when i run my OS91 sx on gasoline the carburetor dont work on low rpm idle you cant turn idle screw sufficent so the engine run on idle. next time i will use my TT 90 carburetor on my OS91 SX.

regards
Bengt

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02-05-2006 06:22 PM  12 years agoPost 16
unklpunk

rrApprentice

alberta canada

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anyone have any schmeatics for the ignition? you could reshape the combstion chamber in the head, to lower compression. might be a neat conversion for an os50 in a 30 bird.
up

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02-19-2006 09:49 PM  12 years agoPost 17
GMPheli

rrElite Veteran

W. Bridgewater, MA USA

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I was always under the impression that you needed needle bearings on the conrod to run gas. I guess not!!!

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02-19-2006 10:01 PM  12 years agoPost 18
Professorwiz

rrVeteran

Livonia, Michigan - USA

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GMPheli
Your car doesn't.

I would love to do this perhaps convert a 46 over that I'll probably be picking up.
Russ

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02-20-2006 04:11 AM  12 years agoPost 19
sunfm

rrApprentice

Chemainus BC Canada

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Thats really cool
I like the video too

with the film of the actuall helicopter and then the inset of the onboard cam

thanks for the post

and your gasser heli is very cool !!

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02-20-2006 03:58 PM  12 years agoPost 20
GMPheli

rrElite Veteran

W. Bridgewater, MA USA

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awesomewiz
No my car doesn't. But it has a pressurized system. All 2 stroke gas motors that I know of have needle bearings on the con rod. All gas conversions that I have heard of in the past have needle bearings on the con rod.

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