eyeofra1678

This is a build thread for Pavel Bosak Jet Trainer in the August 1986 issue of RCM plan# 972
It well have a Hitch RX and servos, OS 25 LA

Wingspan: 51"
Wing Area: 400 Sq. In.
Length: 38"
Weight: 54oz app,
Wing Loading: 19.4Oz/Sq FT

the mod's well be
Aileron's (as I don't like jest having 3ch)
and Retracts if I can find a way to make single-engine Cessna style ( I don't thank the wings can handle the landings as its not that thick) iney info on how to make this retracts well be nice.

hallstro

Good work on this design. I will be following your build thread with great interest.

Pavel Bosak created several interesting designs for RCM in the past. His L-39 and Harrier designs look very interesting. The Harrier has a wing loading of 41 oz. and that makes me shudder!

Good luck on your build project and keep us informed along the way.

Dave

eyeofra1678

OK the 1st thing to do is to make a pre-ket. What I ded is make copy's of all the parts that well be cut as in pic 1. Than I combined all the copy's that 2 or more copy's to make 1 part like the fuselage and H. tell like in pic 2. Then I cut the parts out and taped tham to the wood as in pac 3. Then I used Acetone to transfer the images of the part to the wood pac 4. The canape and wing ribs dent get done the canape well have to what.The ribs are made via the interpolation process. I haven't made ribs like this so this well be fun.

hallstro: The L-39 is on my to do list don't know if I whant to do asis or do it as a DF

hallstro

eyeofra1678:

Can you elaborate on the acetone method? I don't think I have heard of this method. Do you then have to sand off the ink from some of the parts? This is very intriguing.

As for the L-39, you are very adventurous if want to convert it ducted fan.

Good work thus far!

Dave

eyeofra1678

Not alot dun to day. All plywood formers cut and sanded and got the ribs for the 1st wing set to form.

hallstro: all you have to do is get copy's of the parts you need to cut (The copy's must be don on a coyer NOT a printer the coppyer must use toner) tape the copy to the wood. get a rig and fold it to size and damp it whath the acetone then whap and it well tansfor. You don't need to sand the ink off jest put the inked side of the wood on the inside when you do the fuselage. The best thing of this is when I start work on the fuselage I don't need the plans You well see what I mene whan I get to that part.

hallstro

Way cool technique! Thanks for the tip. I learn something new every day on this forum.

Dave

eyeofra1678

OK the kit phase is done. Pic 1 are the wing spars cut and sanded. Pic 2 are the 22 wing ribs (there are no joining ribs so I think I well make some with 1/8th ply.) Pic 3 & 4 are the stb's. Pic 5 is the back end of the canape. Pic 6 fuselage this well be cut after 1/8 tar. or 1/8 sq. are add to the eges so that ca as more joining space. Pic 7 are the formers all cut and sanded phase 2 well be makeing an ARF

eyeofra1678

I know I haven't post in update in a week but I hade to fix my 4* and I tend to stop what Aim belding to make repairs on flying bards.

The Right wing panel is 85% done. 1st I put the wing ribs on the GP's wing jig I hade to get 1/8" rods as the 1/4" were to big for the ribs. I used some ca- on the inner spar. I then CA' ed the top & bottom spears in plase and clapped them down. I put 1/8" dowels in the holes form the jig rod holes (way not use them to give it more straight). I added some front spars up to the 4th rib to give it more straight. Then I put some webbing on the fort & mane spars up to rib 4. Then I added the sub LE and bottom 3/32" sheeting. These seems to be thek for sheeting but thats what it calls for. And last I cut 1 1/4" at wing root to 3/4" at wing tip for the ailerons.

hallstro

Nice work...the ship is coming along. Thanks for the update. Can't wait to see the finished product.

Dave

eyeofra1678

O.K List night I added the blokes for the CA hinges for the ailerons and the TE cap. today I plained and sanded the TE cap to the wing the R. wing is 90% done all that's lift is the wing tip, sanding the LE, and fitting the ailerons, final sanding and covering. No ides on the them let any ides form you peps might be useful I well be starting the L wing today.

eyeofra1678

Ok time for the L. wing 1st I placed the ribs on to the jig the c.sper was added and CA'd then the top and boutm it was clamped overnight. I removed the wing form the jig and added the 1/8" dowes. the webbing was added and sanded. and know I have to go to work[&o]

eyeofra1678

all I got dune when I got home was adding the forward spears and the webbing the sub LE cap was added to[>:]

eyeofra1678

Sub LE cap as been sanded and the forward spear and webbing as been add. Iav added the bottom sheeting. I used water to dampen the outside of the top forwed sheeting as you cane see it started to carve away for the wet side this makes it easer to put in place west of the top sheeting has been added. The TE and LD eages have been CA'ed the L&R wings are at the same pont know

eyeofra1678

Wing tips saned and shaped, LE saned and shaped wings are 90% done. WWWWhhhhhooooo!!!!!!! I find a way to make the retacts so I well be workking on them. The nose gear well be hanger 9 and the manes well have to be made.

eyeofra1678

O.K this designed is simper but sherd work. I got the retract plat cut form 1/8" ply. 1/8th rods are placed in a T fashion. I hatted and bent 5/32th rod so that it has a 1/8th lope and then cut at 11" I cant do any more antel I have the fuselage is dun

EF

Very nice work! good to see proper scratch building in this ARFy model world.

A note on the gear - make sure the metal parts cannot vibrate against each other as this may cause receiver interference.

eyeofra1678

Thanks for the tip EF. But I don't thank that that well be a poblom as there is a built in gape beaten the rods.

eyeofra1678

First I put 1/8x1/8 stiks on the eges of the fusalog. I then cut out the fusalog form the 3/16 shet. I then CAednformers 1,2,&3 to the right side and then added the lift side. Gorilla glue was added to the side of the formers for straight

Mustang Fever

My Feedback: (2)

eyeofra:

Nice build. Pavel has so many interesting designs. Can you tell me where you found the retract design?

eyeofra1678

I started to installing the mane gare I CDed 1/4x1/4 stick on to the fuselages. Fetted 3/16x1/2 spoce to the gare and used Gorilla Glue to glue theme to the sticks. And I used the Gorilla for the fire wall. I have added the 5/32 gare rods and 2" wheels. The 2" wheels were to big to fet in to the fuselage so I used some 1.75 wheels

eyeofra1678

Today I got the o.s 25la out and fin cut the engen mont and added the 4-40 blind nuts. Then I test the fit with the bolts. I used Gorilla to glue the mont in place. I got the 1/4 ply. nose gar marked to cut. Not a lot den today but its a latter closer

eyeofra1678

I got the nose retract block cut and sanded 6-32 bland nuts add. And the retracts were test feted. A nice fet. Now back to the manes I cut out the v. gade plat and I used Gorilla to glue it in place. The downe and look plate was made and added. the downe gide was made and added. And as was the up gides.

eyeofra1678

Her is a link for a video of the retracts


http://www.youtube.com/watch?v=0hEctKXKyfs

Mustang Fever

My Feedback: (2)

Eyeofra

Those are slicker than snot. I'm enjoying the heck out of this thread. Keep up the good work.

eyeofra1678

Today I got the elevator, and throttle, caseing was installed the rudder well have to what antell the top dick is add. 9 2 1/4x4x5/16 was glued to make a block. I then put the 25la inplac and timed the sides.