Hi
I have a ECHO wead eater engine and its output is about 1.8 hp and 11000rpms and after removing extra weight it weights about 1.7kg so i want to ask you that is it a good engine to power a rc trainer which length about 5 or 6 foot and and what size of the propeller it can run and if you guys have such type of building experience or any links or suggestions so please reply me any suggestion shuld be highly appriciated
i will send some pics on my next post

Falcon Samad[:-]

Hi Samad,

I suggest you checking this forum also, where you can find responses to your questions:

http://www.rcuniverse.com/forum/forumid_92/tt.htm

what is the displacement of the engine.old rule of thum

what is the displacement of the engine.old rule of thumb for hp to weight of plane was 1 hp= 12 pounds .you should have about 1500 to 2000 square inches of wing area and weight under 21 pounds.My quadr 35 (35 cc 2.2 hp ) uses an 18-8 prop I would start with a 16-6 or 16-8 prop .

Hi!
For a trainer, for a newbie, it's a very bad choice!

here we go again.

Payload huh?

You need to get a standard glow trainer until you learn what makes a good plane design and proper power to weight ratio.

[link=http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXCXF4**&P=0]proper trainer[/link]
but

for 5-6 foot trainer you need an engine weight of of about .6-.7KG with an output of 1.2-1.5HP.
for your engine you need a 7-8 foot trainer and find a way to increase the output to 2.2HP or get the weight to under 1.1 KG and even then your going to be marginally powered and over weight

If your going to use that engine you more than likely going to need to prop it for 7000-8000 RPM, which mean your going to have to have really long landing gear to clear the prop which will be in the 15-17 inch range, part of doing in alone and by yourself with no experience mean allot of guessing so your going to have to buy allot of props to get it right. No one is going to be able to give you any specifics on the engine since every engine conversion is a custom rig, though prop hubs are available.

[link=http://wackerengines.com/index.htm]conversion kit[/link] this is how your engine should look once your done with it

a gas trainer[link=http://gotgasradiocontrol.com/trainer.html]gas trainer[/link] this is the proper sized model. for gas planes

Or you could look at something like this. I'm thing about getting one for my son to learn on. http://www.amr-rc.com/index.php?path...trainer26_info

Didn't this same guy just ask this same question about two weeks ago? And didn't we all tell him that trying to start with anything bigger than a .40-.60 sized glow trainer will be an exercise in futility, not to mention way more expensive with a much greater chance of failure? It'll cost less to buy a .40 sized glow trainer than it will cost just to outfit an appropriate plane for that engine with servos and batteries.

Yes http://www.rcuniverse.com/forum/fb.asp?m=8908063
He will probably keep asking until siomeone replies, "Here are the step by step instructions and the parts listings to make it work perfectly."