Mid mount or convensional engine installation for P-80 or equivalent could be the best for normal fliying.
It has not significant tail pipe thrust losses and nose weight for balance might be less.
FEJ F-16 flies great on this configuration.[sm=49_49.gif]

I flew my FEJM F-16 with a P-60 mid mount with tailpipe. It took some runway but once in the air cleaned up she went nice. I had the elev and ail mixed so i could use the ail for flaperons which helped the takeoff. Mine went in after 27flights due to ail mounting block coming loose in the wing.
V..

Pulled the landing gear from the F16 today, replaced all O-rings for an easy leak-fix.

Works great now (no locking problems so far) Holds air nicely, tested at 8bars.

Now on to the rams for the doors. All valves will be replaced by electronic ones to save the servo weight.

My F-15 flys great too, no problems there. It sounds like the landing gear in the F-16 is better off than in the F-15 - that's where a majority of my problems have been. I wonder if the scale gear in the F-16 advanced version are more reliable than the gear in the "non-advanced" version?

Bob

heck no, it's a POS.

Hi Joe, bought mine off Mark second hand and its already been flown with an equivalent engine mounted in the tail. I have actually rejigged the rear mounts and put shims in to compensate for the angle of upthrust. it now appears to be on the centreline of the model and it certainly has plenty of thrust at full power!! It has been flown very successfully with Tailerons so I am sticking with them, going to get a very experienced Jet flyer to set it all up hopefully next weekend if the weather is OK. Will let you know how that goes, thanks for all the tips I have been scribbling down notes on throws/CofG etc so I'm pretty sure it will be ok.

You can also use "GUNK" Power steering fluid, with stop leak additive.
It swells the "O" rings rubber safely stopping virtually any little leak.

mate, have the spare parts for your rear engine mount, send me a pm with your details and I will post if this helps.

regards
Todd

What engine do you have in the tail?

Mav[8D]

Mav:I have put in a Wren 54, but I suspect that a Wren Super Sport would be the ideal engine, will know better after next weekend when it has hopefully been flown.

morro: Thanks for your offer, I have an ad on the JMA web site so if I cant find the bits in the UK I will pay pal you the postage cost from Oz if thats ok.

hi, do you know if we can have custom paint job from fej, and what would be the extra cost.
i want to have the l-39 1/7 with this color scheme.

New Jetronic valve.

I know it is better to have a leak free installation (Hard to acheive) but I assume you chaps are aware that the new air valve from Jetronic switches the air off to all parts of the circuit except the tanks after about 7 seconds after each operation. This is an excellent feature. so have large tanks and you should be fine with small leaks provided no leaks from the tanks etc

Dennis

Did you also change the o-ring at the outgoing axle? If so, how did you do it? Can this end of the cylinder be removed or did you push the o-ring in without taking it apart?

Any one know how to deflate the tires on the F-16 fly eagle jet? One of mine is over inflated. Thanks

you have to loosen the rim

Or just fly it, eventually, they'll leak...

Bob

thanks kc I am new to this jet stuff. Picked up my fly eagle jet advanced f 16 at Florida jets. So far all air cylinders or ok. The only parts that leak or the three air valves but troybuilt models is going to help me with that. Model looks great, paint job is excellant.

It is easy to think it is the valves that leak, because if the cylinders leak the air will escape throo the valves. It is the valves that makes that irritating whistel sound[>:] In maybe 95% of the cases it is the cylinders that have the problem. Be aware of that before you changes the valves and hope everything will be fine.
Good luck with your F-16, I'm sure the leaking problem will be sorted out.

Like ela said it's most likely the cylinders leaking internally past the o-ring that appears to be the valves, either way I'd ditch the valves and go with an UP3, they work great and only require a single servo and no sequencer.

starman,

Like KC said, just junk the FEJ valves and get a UP-3. Also, as ela said, the leaking problem is most likely due to leaking inside the retract cylinders. Do yourself a big favor and get that problem *completely* fixed with 100% reliabilility before you go on with the build. If you don't you'll be F#%$ing with it all the time. Dom (Maj. Woody) posted an excellent tutorial on how to fix this problem in the Fei Bao gear ([link=http://www.rcuniverse.com/forum/fb.asp?m=8305981]http://www.rcuniverse.com/forum/fb.asp?m=8305981[/link]). This method works great and insures that the "O" ring on the piston seals completely.

I flew my FEJ F-15 last weekend and the main gear *still* didn't retract correctly because of this problem (and it sounds *exactly* like the retract valve is leaking, which it isn't), so tonight I'm going to use Dom's method to fix the main retracts...

Hey thanks guys for the info every little bit helps. I had an extra set of air valves from another plane and tried all the air cylinders with these without any leaks.hope this is right.

Hey guys i talked to James Chen with Fly Eagle jets today and he told me that they make thier own air cylinders at thier factory now. The cylinders they had been getting where from another manufacture but where not happy with them, to many leaks. James said the leaking cylinders should end.

Hi Guy's !

I have an FEJ F16 1/8 standard version with the third fuel tank. Last week I wanted to make the first flight... My F-16 didn't want to take off, the flight track is budding 150m long. The ground was very wet. My turbine is a merlin 90 (9.5kg thrust).

My C/G is 145mm.
Does someone had the same problem ? I think try again on a concrete runway next time after I will repair.

My F-16 weigh 9.6kg dry.

Best regards

have you checked your elevator settings, you need a fair bit of elevator to get off the grass.

regards
Todd

[8D]
Rapy,

On my one and only flight off tarmak I to found my standard F16 with a Falcon 100 turbine took a while to get airborne. It took off and flew like it was nose heavy. I now have a Rabbit which is similar to your Merlin and will run the COG at 150/155mm for next flight.

A fellow in Qld (Dapsta) also had a F16 Advanced with a Falcon 100 trubine and his first attempt off grass also resulted in an aborted flight a few times. He managed to get it airborne for 1 flight off grass, but sold it as it did not like grass with his set up.

Like Todd said I think they like a lot of elevator and more rearward COG for grass operation.

Mav[8D]