Here is a list of all the postings Martin Levy has made in our forums. Click on a thread name to jump to the thread.
|Thread: Building a curved wing|
This is a scratch build and I have already cut the ribs
Hope someone can help with this one. I am building a Solane Bullet and the wing ribs are curved on top and bottom. Therefore the bottom spars will not be touching the work surface and cannot therefore be pinned down.
How can I ensure accuracy or is it a case of fitting the top spars first? even then how can I be sure the whole thing is straight?
any help appreciated. Thanks
|Thread: servicing a four stroke engine|
are there general cleaning tasks or anything else I should be doing whilst its apart?
I plan to strip down and service a couple of old 4 stroke glow engines. What actions should I take to service and clean and what should I be looking out for when carrying this out?
|Thread: What have I done|
Paul - the engine was unused but I have been using it for about 40 flights.
Ken- a valve spring had broken and the valve was bent and dropped into the cylinder. have ordered a new valve assembly and hope that fixes the problem.
thanks Martin. So I should be ok just placing that bearing back without having to buy a new camshaft?
1st pic is the crankshaft - looks ok to me (I hope)
2nd pic - one nd of the cam shaft and next to it a bearinf that was loose under te4 cam shalft cover
3rd pic - the other end of the cam shaft with a bearing fixed in it and the pic below which is the cam shaft recess and that bearing was loose in there. New camshaft as well or drop that bearing back in?
yes Martin. I have now stripped it right down with the exception of the main bearings
so to try and explain better. I opened the canshaft cover and there was a loose single bearing. On the innermost end there is a visible beaqring set into the end of the camshaft and on the outer end (the one you see when opeing and before removing there looks like a recess where that bearing came from. I cannot see how else a bearing got in there.
I hope this makes sense but if not I could post some photos
And another question. why was there a ball bearing loose under the camshaft cover. Is this supposed to be attached to the end of the camshaft? there is one fixed in the other end and looks like a recess where it had fallen out of the other. Does this mean I need a new camshaft as well?
I took the engine apart and indeed the valve was bent and had dropped into the cylinder. However notice even after removing there was still a jam. I will check the crank pin as there was a loose ball bearing in there from the end of the pin.
Crank shaft seems fine though
Just after posting in another thread about fixing engines I started my OS 30FS today and the rubber cone in my starter flew out, jolted the engine and now the prop turns either way half a turn and then jams solid.
I bought it unused only 6 months ago
What could I have done?
|Thread: Saito and OS engine servicing|
thanks for all the help. Guess im going to have to teach myself to fix them. Made a start on an ancient engine that's never worked and couldn't even get the screws undone (hex screws worn) or remove the rocker assembly. great start
Can anyone service and repair Saito and OS four stroke engines or knows someone who can.
On the occasion I have sent mine to MacGregor industries they just seem more interested in overpricing and then telling you its cheaper to buy a new one and half the time I don't believe them frankly.
Please let me know.
|Thread: De Havilland Airco DH2 scratch build|
wings all covered, struts painted. Foam cowl ready for finishing and painting. Undercarriage built, just need to paint. Not true scale wheels but ive had these hand made spokes for years so going to use them
decided to fit servos into lower wing. Having asked a few others who went for the scale cable route, the general feeling there was quite a lot of 'play' which I thought in a bigger madel would only be increased.. Dry fitted for fit before covering and gluing. Things are looking ok so far. Gluing all the bits together is going to be a bit of a task though. Next step - constructing the elevator and rudder links and undercarriage
Thank you Roy for going to the effort of photographing and detailing. Some ambitious rigging there. I too was contemplating two mini servos in the bottom wing and I guess while I am at this stage of building would be better to decide now. If you started building this again is that what you would do? thanks Martin
Hi Jeff why turn the tank around? Surely the pipes need to face the engine??
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