mhadjiky

I will try to fix that problem.
Levi Wags, did you use factory recommendations for C G on your Mig29?

Levi Wags

Yes mate factory settings for cg are correct. I think I went for the rear most setting. To far back though and the plane can snap under elevator.

mhadjiky

Do you have pictures of pipe and turbine installation?
Did you put weight in the nose to achieve correct CG?

essyou35

My Feedback: (11)

I emailed skymaster for pipe install pictures. Something that important they should not leave out. I want to know exactly how they expect it to be done. Right now I am seeing I need to glue in my own mounting places etc.

essyou35

My Feedback: (11)

Got several pictures from skymaster I will post them

Levi Wags

I sold the Mig to a mate as I have another one but I'm sure I have some pics somewhere.
If you don't install the OVT set up and are using a single turbine the Mig will come out nose heavy. I balanced mine with the install and battery placement and no additional ballast.

mhadjiky

Where did you put your batteries guys?
Did you put anything in the nose?

Guys if you have pictures, please post them. It will be a good help for all of us.

Levi Wags

Put the lightest stuff in the nose. I put the air tanks in there.

mhadjiky

I have post some pictures showing my progress on Mig29.

In the manual is written that Elevator throw measured at the root is 40mm. Where I have to measure? If I measure at leading edge seems too much and if I measure at trailing edge too small. Normaly we measure throws at trailing edge at the widest side. What did you do on your Mig29? The pictures that I attached shows elevator movement if I use 40mm up at leading edge.

dubd

Nice work! I measured from trailing edge. On maidens I always have a high rate position just in case the manual is wrong. If you doubt it, do the same.

mhadjiky

So you measured 40mm up and down from trailing edge?

dubd

Yes. I adjust from there.

modtron

Wrong post

Justflying1

I think you are getting your Trailing and leading edge mixed up. Leading edge is the front of the elevator and the trailing edge is the rear of the elevator. Take your measurement from the trailing edge of the elevator ( rear) and this will be correct. It's impossible on your Mig-29 to have a deflection larger at the leading edge from the trailing edge unless they have put the rotation shaft in the wrong spot which I also would say it's practically impossible considering a number of things which I want bother getting into. So my conclusion is that I'm 99.999999999999% sure that everything with your elevator is where it should be.

essyou35

My Feedback: (11)

You'll have to show me how you got your pipe to be secured. Skymaster told me I have to build up a mount for it. With the two tangs there is a lot of movement in the pipe and it will melt your jet if you only use those two tangs.

Any hints?

DrScoles

My Feedback: (18)

Even with the way I had it mounted in these pics, I saw the pipe move backwards with full power. So, I put another piece of plywood behind the metal strap farther inboard so it was very close to the pipe wall. This way the metal tab had no room to flex. Sorry, don't have a pic with the second piece of plywood.

Craig B.

Guys I would be orientating the mounting tabs on your pipes axially if you can (ie. parallel to long axis of model) not transversely as in the pics above. Could you do that from the hatch further forwards? If you mount them transversely, that will cause the rearward movement under power. Not trying to "dictate" to anyone though... Just a suggestion based on 15 years of flying turbine models.

essyou35

My Feedback: (11)

Craig doing that is tough on this model since there is a big bulkhead that the turbine goes through. Having them go parellel would put them very close to the turbine is they would have to squeeze between the turbine and the bulkhead former. Skymaster sent me a couple of pics. In one you can see what I am talking about.

In the other picture he "shows me" how to mount the pipe, which is not even this jet and that looks like a turbine bay.

I am not going to complain too much I just want to fix it. But I hope now that FEJ is out of the picture skymaster will start getting some of the heat they deserve so they can be motivated to up the quality and R&D. This is really a bad design and they have done nothing to attempt to fix it. They cant even show me how they expect the pipe to be installed. Its a joke.

I just want to follow the instructions exactly so if mine goes in I can show its not my fault. But they dont have instructions for mounting the main pipe correctly. All the pics in there do not show the tabs ever attached.

Ok thats all I am saying now forever about it so back to work.

essyou35

My Feedback: (11)

Dr Scoles I like your way of mounting the pipe. The movement I am getting is up and down, side to side. I am going to have to build something to hold it in place. The wall on the stock pipe is flimsy to the tabs can deform it and let the pipe move around. A mount around the pipe that holds in place and touches a larger area of the outer wall is needed.

DrScoles

My Feedback: (18)

I just bought a Sist 1/4 scale focke wulf… no instructions. I knew that going in, so not a big deal. The sky master manual is middle of the road IMO. That's why I started this thread, to try to fill in the gaps. If you want cookbook instructions, buy BVM or comp arf. Luckily, we have the amazing inter web and a bunch of helpful people who have usually experienced all the mistakes before we get to make them.

Different topic, I have jackie sacks wing bags for the Mig-29, very lightly used…. If anyone is interested in them, PM me.

cigartoyz

did skymaster ever send the pics of the tube mounting?

DrScoles

My Feedback: (18)

I think it might be best to engineer it yourself. The bell mouth, surprisingly,, does not get very hot at all. I had to have wood as close to the wall of the pipe as possible. The metal tabs are just too flimsy.

mhadjiky

Guys I just saw your last post because I did not receive any notification.
First I did not mix trailing and leading edge. Some guys, not in RCU, told me to measure the throw at leading edge and I found it very strange. That was the reason I was asking your opinion. I will measure 40mm up, at elevator trailing edge. It looks small movement but according your experience is enough.

At the moment I do not have pictures of thrust pipe installation. I would like to share with you my way and get your feedback. I will post some pictures later today.

mhadjiky

I have secured bell mouth on pipe with four high carbon screws.
Then I have cut 3 wooden blocks and I made a slot in each wooden block. I placed the lip inside the slots and I glue the wooden blocks with Hysol on the fuselage. Pipe can not be moved. In case that I have to remove the pipe I must use dremel to cut wooden blocks and make new wooden blocks. This operation took less the hour to finish.

DrScoles

My Feedback: (18)

Looks good to me. No worries on heat unless you have a hotstart or something weird. I got your email on the elevator, you do measure from the back like you showed with the green dot.