David Searles

My Feedback: (49)

If you're considering FB contact Mike Linn at Global Jet Club & buy the GJC version. Mike goes completely thru the stock FB kits and makes improvements where necessary and then flight tests the models to make sure everything is good. definitely the way to go IMO.

David S

wop flyer

Hi David, thanks for your help. I have contacted Mike Lin and he will put my name on the list, i here good things about the Global jet club. He will let me know when they have finnished the Test flights.
Carm

wop flyer

Hi Folks, in this months Jet International Colin Straus is doing a development build for Fei Baos F-100. Sounds very exsiting, however the plane is over the 20k limit here, i have never put anything together that big befor!!! any help would be great befor i make my mind up
Carm.

David Searles

My Feedback: (49)

I'd advice patience. Wait until Mike has the model and goes thru it. He will make recommendations to FB for changes necessary. I would be willing to bet, that by the time GJC is done, the jet will be considerably lighter.

David S

wop flyer

Thanks David, im also looking at the FEJ J-10. Im in no rush so i will see what happens.

stoni1

Jorg,

I set my CG at the factory recommended location and have never changed it. The jet flies quite well at that position.

The SM F-100 is smaller so a mm to mm comparison doesn't apply. However, the BVM is the same size as the SM and the recommended CG is proportionally about the same on the FEJ. I've owned both the BVM & FEJ and really couldn't tell much difference at all in their flight characteristics. Excellent for both.

David S[/QUOTE]

stoni1

Hi Guys, Help really needed on the FEJ F100.

As reported before my Pal tried to madien his F100 and it would not rotate and ended up running over the freshhold and crushing the nose and additinal wing damage. We assumed that the CG was off so we modified as per this thread and moved the turbine rearwards and moved the fuel tanks over the CG. We tried to fly her again this weekend and basically even after all these mods and setting the CG at manfacture spec ( CG at 400mm dry, UC down) she still would not rotate again at full power but when the freshold was reached and the engine chopped she leapt into the air and then pancaked smashing the gear and wings. back to the drawing board!!!! It looked like it reaches terminal velocity at about half of the runway and to my eye looks like it was going fast enough to rotate ( running a jetcat 140) but it just does not rotate. Just for info we have.set the take off at half flap and half leading edge slats and want to check this is correct with the guys who fly this model. Also are you guys
happy with the AOA on the stock undercarriage as the front leg looks a bit short to me but only cluttching at straws now.

sskianpour

My Feedback: (2)

Wow! How much throw on the stabilators?

Shaz

stoni1

Set at Factory Spec, I cant remember of the top of my head but I think it was in.the region of 50mm each way...quite a lot, like most aircraft with all flying tailplanes.

dbsonic

My Feedback: (3)

Leaping into the air... sounds like less than positive AOA. What is your wing incidence angle w.r.t the surface/ground plane?

mr_matt

My Feedback: (10)

Thrust line per spec?

stoni1

Yes, I have the same suspicion. The wings are in a mess at the moment and require some major work so I can't check what the incedence is relative to to the ground yet. I wondered if the front nose leg was a bit short or maybe the oleo spring too soft allowing the nose to compress under power and therefore giving a negative AOA. If I remeber correctly It is not siting exactly nose high. What about you other guys with this model? does your model have a positve AoA sitting on the undercarriage?

stoni1

Well I think so regarding the tubine and pipe position as they can only really fit one way. But I fear that the nose is a little low allowing the thrust line to drive the nose further into the ground and producing a negative AOA. Would be keen to hear from others with the model about their set up and AOA, spring dive ect. I'vel looked atpictures of other FEJF100 and they look a little low on the nose as well but others dont seem to have a problem rotating so this may just be a red herring. confused!

As a side note I just want to check that you guys set the CG with empty fuel tanks. The instructions dont say, so we set it dry with undercarrige down. Help please!

rcpete347

My Feedback: (251)

Hi, I have seen problem many times, do not use any flaps, should solve your problem.
Rcpete

stoni1

Thanks, do you fly this model? We did wonder about this as we set flaps and leading edge slats at half way for take off. ( we have e-mailed the manufacture to ask this question about recommendation for take off flap and slat but have no reply yet) Can the other guys who fly this jet confirm if they take off with a clean wing with no flap or slat ?

David Searles

My Feedback: (49)

This is a thrust angle issue. Your pipe is out of alignment. At full power the pipe is directing thrust downward, which is making the jet difficult to rotate. As soon as the thrust is reduced, the airspeed and lift takeover and the jet springs into the air.

Check the angle of your pipe and if the turbine is centered.

David S

2walla

My Feedback: (10)

Sounds like too much negatine aoa on the takeoff run. Put a slug in the nose strut with the spring so it cant compress on takeoff.

stoni1

Thanks for your comments David. I have checked the pipe and it is centred on the engine mount bearers at the front and the rear is centerd through the tail pipe former. the engine also is centred so it all looks staraight to me.

stoni1

2Walla, I am thinking on the same lines, however others seem not to have a problem with their stock springs, so i'm confused.

stoni1

David, Do you use some flap and leading edge slat for take off or do you leave the wing clean. Also can you confirm your trailing edge flap settings. The instructions sugested full trailing edge flap at 40mm which doesn't seem very much to me. I just looked at Fai baio F100 spec and they have 40mm for take off and recommend a minimum of 100mm full flap.

David Searles

My Feedback: (49)

Yes, all of my flights have used both leading edge and trailing edge flap. The normal sitting attitude for the F-100 should be fairly nose high. If during the takeoff run the nose starts to dig down, you need to find out why. Either the nose gear spring is way too soft and can't hold the nose high AOA, or you might be using too much flap, as the jet does tend to pitch down with application of flap. I have up elevator mixed into the flap at both takeoff and landing positions.

I can't give you actual measurements because the jet is currently disassembled going thru a complete refit. I'm stripping the paint in order to FM it.

I would not recommend attempting taking this jet off without flap, unless you have a very strong headwind!

David S

stoni1

Thanks, David I think with your comments I am definately on the right track now. If anyone else can give me an approximation of takeoff and landing trailing edge flap it would be very helpful. Cheers!

Also, I am now wondering if the tail planes have been fitted at the right angle to the fuz. Does anyone have a reference point on the fuz for the correct angle when the tail plane is at neutral?

diver15

hi i know its a long shot but does anyone have a manual for this jet
thanks andy

bidrseed2

My Feedback: (2)

I’m about to start mine, so could do with a manual aswell.
I was going to use the bvm model control throws but I don’t know about CG.

diver15- I see you’re located in the UK…might be worth dropping me a pm, see if we can help each other.

diver15

i have emailed fly eagle about 4 times asking for there manual not 1 reply fly eagle at its best again