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HelicopterAerial Photography and Video › On the Kawasaki TH48!
10-09-2005 04:45 PM  12 years agoPost 1
Helicek

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istanbul - turkey

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Hi all,
I am posting this question on this thread since most of the AP fellows are experienced petrol engine users.
I need help to get more power from a Kawasaki TH48 engine. It is 48cc and rated 2.2hp. This is such a nice running engine out of the box. I installed it in my 18kgm CamCopter and it could not even hover. It has 1 to 9 ratio and main rotor rpm is around 1000. It just lacks power. I know this engine was specifically produced for weed trimmers and that is probably why it is low powered. Considering the fact that I am in Istanbul-Turkey, can you tell me what modifications can be done on this engine in order to get more hp? (3.5hp or more contnious)
Any help will be appreciated.
Ahmet

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10-09-2005 05:21 PM  12 years agoPost 2
ericslife

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vancouver b.c.​Canada

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Aside from sending it to Hanson , Give it to a good mechanic to port polish and balance it as well as modifying the ports some what.
My mechanic did the same to a walk behind mower and it became a run behind mower
Eric D

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10-09-2005 05:32 PM  12 years agoPost 3
Helicek

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istanbul - turkey

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Thank you Eric,
can you tell me a little bit more about modifying the ports of a 2 stroke petrol engine?
Cheers,
Ahmet

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10-09-2005 05:36 PM  12 years agoPost 4
GauchoVolador

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Tx

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It sounds like 2.2Hp for a 48cc engine is way too low power, it will have hard time getting 18kg in the air.
Hanson's 26cc produce 4.5HP with its exhaust system.

What is the peak RPM where this Kawa engine produce this power?

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10-09-2005 06:04 PM  12 years agoPost 5
Helicek

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istanbul - turkey

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TH48 produces 2.2hp around 7500rpm. Look at the address below.
http://www.motogarden.com/th48.htm

What do you think of the Hanson's 26cc?
Will it be a good motor for a flyingcam heli?
What sort of gearing ratio should I be looking for my 1100rpm 220cm main rotor?

I find nice looking engines at GoPed stores.
Look at PS-UK at:
http://store.securehosting.com/stor...43/shophome.php

And a Zenoah G43-L-D at: http://www.getaped.com/. This looks like a very nice engine too. But I have not seen this on Zenoah home page. I have inquired about hp, rpm and torque values I will report if I get an answer.

Cheers,
Ahmet

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10-09-2005 06:52 PM  12 years agoPost 6
Crazy Horse

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Orlando FL

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probably the first thing that would help emensely is go to a 7:1 gear ratio if you are using a 9:1....

at 9:1 gear ratio your motor is peaking out at about 770 head speed which is 20-30% lower than what you want to be at....an increase of that much headspeed will give you alot more lift with the same amount of pitch

as far as modifying the motor some change the timing by raising the exhaust port (taking out metal on the upper side of the exhaust exit) and also some open out the sides of the intake port and/or inlarge the transfers inside the motor

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10-09-2005 10:37 PM  12 years agoPost 7
GauchoVolador

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Tx

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I agree 100% with Caballo Loco (Crazy Horse)

But it seems anyways that those 2.2Hp are not enough to do the job.
Cheers

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10-09-2005 11:48 PM  12 years agoPost 8
Crazy Horse

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Orlando FL

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HAHA I've been called many things but not that! At least not that I know

A friend that has been in the hobby for many years has tested AUW aircraft powered by a stock G23 with comparable HP to 24-26 lbs (10.9-11.8kg) but I dont think he weighed in any where near that heavy. A comparable wt. aircraft w/ payload would probably be more like the Bergen Industrial Twin and I believe the Twin in that copter is more like 8hp. If you are interested in Hanson modified motors, the 3dmax like I have in my gasser is rated by BH @ about 5.3hp with his tuned pipe...that is a peak hp figure not necessarily working and with his tuned pipe not a more standard muffler.

Let us know how you get along

CH

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10-10-2005 01:33 PM  12 years agoPost 9
FCM

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Surrey, England

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Ahmet,

I have just been looking at the Kawa link you provided and I see that your engine does in fact produce 3HP at 7500 RPM.

The peak torque is around 5000 RPM which means you have a good spread of usable power between 5000 - 7500 RPM.

I would gear your heli for an engine speed just below the peak power - perhaps 7000 RPM and try flying with this first.

A quick and easy way to produce more power from this engine would be to experiment with removing the air filter and maybe installing a suitable velocity stack. The exhaust system may also benefit from a change. I imagine the stock exhaust will restrict the engines performance - maybe a Goped tuned exhaust or muffler could be fitted or how about the new JR GS450 pipe?

As a last resort, I would then look at modifying the porting as any modifications have to be done together with a suitable carbi and exhaust otherwise they will be pretty inneffective on their own.

Don't give up Ahmet as it does sound like you have got a good smooth engine there and this really is important to you.

Paul.

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