Discussion in 'Morgan Aeroworks' started by Sloper, Dec 14, 2010.
I realise that it is being fitted in a Sierra but you did mention its performance in a Cougar.
Good point Alan, We have a larger nose leg 11/2"x 83 thou heat treated,as it will have an extra 100lb on it, the C/G would move, so the fire wall would also move. My blue Cougar nose length is ok ,you may notice the grey Cougar has a longer nose,this is good for a 4 seater with the Jab engine weight,where my blue one is limited to 75kg in the rear seat. I am also looking at a longer canopy (my new sierra canopy we made a 3m long bubble),a lot less curve)and move the join aft for better entry to the back seat,a better folding seat,also a lot more sweep on the fin.
Thanks for the reply Gary, I knew that you would be improving your aircraft all of the time, I just wanted to let everybody know on this forum.
Been a while, not much work done on the plane but a heap of car maintence.
Have a idea about the elevator trim that l would like to run past people.
Always trying to have redundacy l wanted to be able to use the elevator trim to fly the aircraft if the elevator cable or controls failed.
Flown a warrior with the trim wheel just for the experience (not landing or take off)
Have a look at the pic and give me some thoughts.
First the trim wheel is conected to a relay lever by a continuos length of bungee.
Then connected to the relay lever is a Bowden cable that is connected to the elevator horn.
Simple l think.
l would expect to have a number of positions in the relay lever to get the force required right and the bugee cable would be 1.5-2m long.
Cant see me getting much done until after April, have anew decking to build and one of my sons purchased a Gemini rolling shell which muggens here will have to paint and get it going.
it's not geared low enough!.No finesse of operation..why not get one of those electric servos ( R.C. Allen) and plant it in the tailplane..( I did) ...otherwise look for a geared right angled drive.(turn the handle and you get a push pull motion) ..an italian company used to make one. Ingegno I believe....They also make great wheels.........
These can be fitted with a single solid wire to control a trim tab directly or flexible cable to apply spring bias to the elevator control rod
Craig and I installed a Ray allen servo with trim indicator and dual control switches , the servo is very light and has a lot of pull and is very finite in controlling the trim flaps ( we install 100mmx600mm trim flaps into our elavator)
it is easily controlled and the total cost about $400 and a loom of 5 wires to the rear ,just my solution
Yes l know the gearing is too high in the sketch.
Electric hmmm, maybe.
I've had my Allen servo for 7 years now, I got the up/down rocker and the positional led with it... works fine. Althought I like that manual red thing in the previous post. But then you have to have a push/ pull cable which spells disaster if I jams ( just like my original one..) .OK if you can get access...are you going to move the whole elevator asd a trim opr put a tab on the trailing edge.?... ( much simpler ) ......
Planning on the whole elevator, hence it wont require much movment.
Trying not to have anything incorporated in the elevator.
I'm sorry Bruce. Excuse my ignorance. But, I don't see how your drawing of the trim works in conjunction with the elevator/joystick/ up-down action?
I've fitted the RC Allen trim servo and moveable tab (complete with rocker switch and LED position indicator) to my Sierra project. I've flown a Cheetah with the exact same trim system and the fore/aft authority is excellent.
Just stick with the kit one as I cant remember the last time I used my trim. once its set you wont use it ?
Just read thru your entire thread, Bruce, Very impressed with your workmanship and innovations. I too have spent years stuck in the shed building and learned that it's easy to neglect the most important component of all: your flying skills. Are you keeping your hours up, especially in a similar aircraft?
Not flying as much as l want but am keeping my skills ok.
Next flight is a check flight.
Medical due next month and shhhh l am turning 50
...only a youngster!
Bloody hell , That's why I don't believe I can build an aeroplane , There's just not enough time left (70 next birthday)
All you'd need to do is make the cable reel smaller ( a lot) than the handwheel, it's simple & reliable.
Of course there is. 5 years to build at the most, and at least 10 to enjoy your labours. At 72 I'm just waiting on my inheritance (mum's a healthy 96yo) and then it's all stops out to build one of my creations.
Good on you mate! 70 is the new 65!
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