Well done Patrick!

I will be programming the KC this week and the usual taxi and range test this Friday, if all is good the the maiden may happen on Sat.

Patrick, if I need help with the mixings or any special features, can I count on you?

Help
 

You sure can. PM me and I will give you my cell if you need to call.

Patrick

Excellent!

Tks

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Testing fuel plumbing and smoke, purge and engine ran next.

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Ok, so about two hours and two Lagunits later and some fuel on the ground and on my shirt and shorts, I have some good info on CG and TO weight.

TO weight will be 39 lbs, this is with full fuel, main tanks and UAT + 60 oz of smoke, CG at TO is 1" forward from the recomended CG point ( holes on the booms )

CG without fuel ( in case the smoke pump doesn't work after TO and he still want to fly ) is 1" after the recomemded CG with the main tanks empty ( again, the holes on the booms )

Lifting this monster by myself? heck no! I had to ask my daughter ( who will be taking rc flying lessons from me soon, YEAHH! ) to help me lift it of the stand.

Time to run the engine before wife arrives :)

When you say CG without fuel, is that with all fuel drained? If so you may want to fill tanks to about even or just below the wood plate holding the UAT and recheck the cg. Thats where my fuel level is after about a 7-8 min hard flight on a Jet Central Cheetah. If the smoke should not work while flying you would never fly the plane empty which would take about 10 mins of some really hard flying. As far as lifting I put mine together on a table at my field then put it on the ground and fill......if you try and lift that plane full you will hurt yourself.


Patrick

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Agreed, it is too heavy to handle when full of fuel.

All this testing is so I can get an idea where the CG is to the extreme.

I gas my Boomerang on the ground also.

Ok, I'm about to run the engine BUT, I'm getting this massage on the GSU, it is temp prob related?

I had a temp fail on my TJT years ago and it was something like this.

I posted my findings and questions regarding this problem on the JetCat engine forioums.

I also send George the question with the photos.

After doing more testing, I decided to order a new temp prob from DW ( here I go again ) good thing is that they have the parts.

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This engine is mounted permanently now that is has the FOD screen on, I can swap the temp prob without removing the engine from the mount.

Has any Spektrum users experience a 20310T receiver not binding with 3 satellites, only with 2 sattelites? I'm having that problem, I want use all 3 of them.


Tks.

Check for a bad lead from the rx to the satellite that won't bind. If that doesn't do it, do you have another satellite you cans use? Make sure all the satellites are DSMX.

Ok, I will check, they came with the receiver, all in a new package.

Well, I got it bind on all 3 satts now, I had to bring the radio to the receiver's face in order for all 3 sats to turn on.

Zeeb, thanks for the suggestions, I did try that also.

Moving forward.

Now I'm stuck with the gear not going up all the way, they go down with energy and they lock good but the hang half way up, using a Jetronics dual velve.

Patrick, pm sent, call me.

I've started the programing, what a headache, not knowing much about the Spektrum systems is kind of mind bugging, but at least now I have the receiver binded to the radio, and I got a mix on the rudder, using two chls, the brakes are working good with the new Xicoy brake valve but the Jetronics retract valve doesn't want to bring the gear all the way up and locked, down is good, up is not.

Patrick, I'm going to watch those vids you recomended

I tried using a xicoy/jettronics retract valve and it did not work well for me either. It really struggled to get them up so I went back to the BVM retract valve. The one thing that I would change, in the video he suggest putting up elevator in when you drop the flaps....do not do it. Just add the necessary elevator when you test fly..wont be that much added when you need to add it.

Patrick

Ok, I'll keep that in mind, not to add any elevator down.

Got an SM F-14 from a guy and it had the Jettronics retract valve, one problem after another because the model had a number of air leaks in the gear system. While most retract valves remain pressurizing the retract/extend position of the gear, the Jettronics shuts off the incoming air. This is particularly insidious on that SM F-14 as it has up locks on the gear and no down locks. So if you did get the gear retracted usually by rolling the model inverted, all the air bled out of the system and you couldn't unlock it. On the other side is that once extended and no down locks, the mains would fold on roll out after all the air bled out.

So, my KC has a BVM retract valve, my new Havoc SS has Electron gear and we just finished converting my Avanti S to Electrons.

Moral of story; have you checked the air system for leaks? Got a BVM valve and small servo laying around?

Zeeb, I actually have the retract valve from the other KC but, since this KC came with the Jetronics valve then why not use it but, it is getting to be a pain in the touche to say the least, throughout the years I keep reading from guys asking for help to figure out these valves, I've never used one because of that, on all my airplanes, jets or prop, I've used the Robart air valves for the retracts and a micro push bottom for the brakes with 100% success.

Air leaks? I left the gear on the up position for a long time with the gear still hanging half way up to see if the would leak out, nope, the pressure swon by the air gage remained the same, my conclusion, no air leaks up or down, when pushing up on a main strut with the gear hanging half way up, the other main strut moved down.

Thanks you for posting Zeeb.

Zeeb,
I can verify that the electronic valves will not bring this gear up even if you dont have an air leak.

I know they make a high flow electronic valve and it is supposed to work better, but for sanity's sake, go back to a mechanical valve to get those big gear up. Just went through this headache and no matter what, evan at 120psi it couldn't get the gear up. Either go to the BVM valve or a JMP valve..the JMP valve will definitely get that gear up. Carlos I just saw your PM I will call you in a bit and it's up elevator you will need when you drop those flaps.

Patrick

Copy that!

Call me at 1:10 my time if possible, doing something right now.

Temp prob is on the way, I discover a rudder servo may not be good, it's moving erratically, I'll have to take it out and check the extention, sometimes this happenes if the model is not used for a long time.

Who knows what else I'm going to find during the programming so, with that in mind, I'm pushing the maiden to a month from now to give me enough time to fix all the bugs with the servos.