yellow a4 skyhawk - RCCanada - Canada Radio Controlled Hobby Forum
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Old 12-16-2002, 04:48 PM   #1
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yellow a4 skyhawk

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i got this plane used with an os91 it has the sport wing what did these things fly like. will grass be possible engine is well used. the servos have to be installed again, throtle is shown above tne fan. does a bell crank setup have to be used ? im new to jets also unsure of how the pipe goes on the engine a spring but no hooks

robert jesso
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Old 12-23-2002, 06:13 PM   #2
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I have never heard of one of these planes being flown off grass, such as from a regular flying site. The scale wheels are the main problem with most of the ducted fan jets. Their small size creates so much drag that you run out of field before you get to flying speed. And, if you yank it off the ground too soon, you crash, just watch some of the Crasher videos, they are not only funny but very educational. If your motor is that well used, I would look for a paved area for that first try and let the plane have a longer that normal takeoff run, just to be sure you get that speed up. keep the climbout reasonable, no vertical stuff.
The plane flies well, seen several fly, and a freind of mine had one for many years, but when the engine died in the air, you are flying a brick due to it's small wing area. You have to put the nose down and keep up your flying speed. If you do have a engine out situation and cannot get back to the field, then keep the gear up and belly it in as smooth as possible. The small wheels might as well be tent pegs as they dig in and rip the gear out anyway or bend the struts.
The tuned pipe is attached to the back of the engine and held in place with the spring wraped around the cylinder head. There is a large "O" ring gasket that is between the pipe header and the cylinder head. Do not attach the pipe to the cylinder with metal to metal contact. They will chew themselves up on the first run. The tail end of the pipe is held in suspension with another thin "O" ring and a support bracket.
As far as the bellcrank setup for the throttle, it's common practise because of the angles and also it isolates the servo mecahnics from the direct engine vibration.
The vibration is the main cause of equipment failures with the ducted fans. So, after you strip your engine and clean it all up, be sure to use locktite to secure every screw and nut.
That's why I am getting out of the I/C ducted fan stuff and switching over to electric powered fans. Much quieter, no real vibration and as a result, you are welcomed at your home field instead of being shunned because of the noise. Also, it's cheaper in the long run due to the life run on the brushless motors, only one moving part.
Anyway, this is my two cents. If I can help you in anyway, drop me a line.
Good luck, safe landings.

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