hendrix

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SUCCESS AT LAST!!!
Today i made quite a few flights all of them perfect!
The vertical performance is awesome, it climbs accelerating all the time! and on the other hand i can fly while almost in idle!
That is a very stable airframe indeed as it tracks straight and doesn't drop the wing no matter what.
Of course i had to repair the aligning holes for the outer wing as they were wrongly drilled and one boom was getting lower than the other.
About the problem i had with the approach speed i solved it once and for all.
My mistakes were:
1) i also used rudder braking which upsets more than needed the balance of the plane.
2) Not enough up aileron for crow braking.

Changed to no rudder braking, full flap down at 80 degrees, ailerons up 14mm (~80% of full up travel)
and elevator 20% down.
After a fixed those the plane just stops in the air!
I can probably now tune in some rudder braking but i dont think it is needed any more.
I took a few videos but i need to process them in order to upload them if someone wants to see them.
I want to thank you all for your help because without your help i would be lost as jet flying in Greece is not that popular at all.
Chris

highhorse

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OUTSTANDING !!!!

Thanks for sharing it with us !

hendrix

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The least i could do.
Chris

ViperOneNL

Hyman,

I answered your question in post 2024!

Cheers,

Mick

hyman

hi mick, sorry missed that post, thx for the reply. When u mean the same length as the whip antenna, does that mean including the base and threads on the whip???

Carsten Groen

hendrix,

congratulations, I'm hoping for the maiden of my own Baby Boomerang (with a P80) the 13th october at a jet meeting here in Denmark

videos pleeeeease

Regards,
Carsten

hendrix

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Hi.
I need to ask for your opinion as i suffered fod but i can judge how serious it is.
I have a FOD screen but something did manage to pass.
Here are a couple photos so i can hear your opinion.
It doesn't look that bad but then again i am not that experienced.
Some minor notches are barely visible but the photo makes it look much worst than it looks.
The notch on the lower right side was there since i bought it used, it is not recent.
Chris

highhorse

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I'm sorry, but I don't see the fod. Is it on a blade or the shaft??


Oh, wait, are you talking about a nick on a blade at 10 o'clock??

I'm no model engine mechanic but based on my FULL-size experience I think you should/could VERY carefully smooth out that nick removing absolutely as little material as possible. You'll need a very fine rounded file. The object is to blend the nick out to prevent the blade from eventually cracking at that point. If you remove only the tiny bit of material reqired for the job you shouldnt have any vibration issues when you are done, especially since the nick is so close to the shaft.

Again, that's my barely educated opinion. It's what I would do, but you should see if a more qualified reader differs........

Good luck, Don.

Kwesdog

The closer and closer I get to finishing my boomer the more and more I wanna just wait for the 12FG 2.4 too come out instead of messing around with my 9C with not enough channels to make everything work correctly without crazy mixing or Y-harnesses.

What too doo, What too do???


Harry

hendrix

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Yes that is the fod i am talking.
There are other smaller nicks on the other blades but are barely visible.
I think i will try to smooth the fins as you said but i am concerned about the efficiency of the compressor.
The photo makes the nick appear much worst than it really is.
Thank you for the information.
Chris

highhorse

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Don't sweat the efficiency. I doubt seriously that it'll be a noticable difference. The nick itself probably disrupts some airflow too.

hendrix

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I also think that the nick itself will probably disrupts the airflow more.
I have read some real airplane turbine service manuals and they describe the procedure for smoothing out the compressor blades.
It seems that it is a rather common problem.
Thanks Highhorse for the information.
Chris

hendrix

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Problem fixed.
It was more of an illusion than a real problem.
I doubt that even a few grains of aluminum were lost as the scratches were surface only and haven't damaged really the fins.
The original blade shape is retained 100%
The only thing that puzzles me is how this damage was created since i have a FOD screen.
Can sand or dust make such small marks on the fins?
Chris

highhorse

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I suppose it it doesnt take much at a gazilllion rpm to nick a blade.......I just don't know

nt flyer

Hi Hendrix, I can only offer my experience (as a licenced engineer) on full sized turbines fitted to helicopters. A Sandy or Dusty atmosphere will errode a compressor significantly, and will leave the leading edge of a compressor sharp and jaggered. Most full sized turbine manuals will have a procedure for blending damaged blades, usually nicks or scratches, usually more criticaly towards the root end. However errosion from dust / sand is very hard to correct, and usually ends up with a compressor change.

I guess model turbines would be much the same, but at such high RPM's blending would not perhaps be as effective without the tooling to re balance the rotor assembly.

Cheers,

Greg

hendrix

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I suppose that is logical.
I am going now to the hardware store to see if i can locate better mesh wire in order to build me a better FOD.
Chris

B58

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I used to see the F-100 engines in the F-16 with sand nicks quite often, and they had to be blended. So a piece of sand could certainly go through your fod screen and nick a blade.

hendrix

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Thank you very much for your valuable information.
It is nice to have at least 3 as i can see REAL mechanics assisting me
I feel like a top pilot
Meanwhile my new main struts are hear, Now that i fixed my landings i am thinking if i am going to install them or not.
They are made by Eurokit, i don't like them already as the tolerances are not that good and one spring had one turn more making it stiffer and limiting the travel.
On closer inspection cracks were found so if anyone wants landing gear parts better buy something else.
Here is a photo but not a good photo at all...
Chris

highhorse

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Chris, to clarify: I am NOT a mechanic, but I DID stay at a Holiday in Express last night !!

My post was based upon years of peering into jet intakes during pre-flight checks and reading what the guys w/ the real brains (the mechs) had written into the logbooks about the many blended blades I've seen.

The Eurokit gear have a pretty shaky reputation here in RCU.

You might check into the gear that Todd over at DREAMWORKS sells. I haven't seen 'em but I hear that it's a quality imperial specked knock-off of the Jet1-A gear which are top-notch but built to metric specs.

hendrix

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You have a vastly greater experience than me so i know that you know what you are saying.
Indeed Eurokit gear doesn't look very good and i know that Dreamworks makes excellent gear.
I do want to experiment a little with the front (nose) gear because i use the Kavan electromagnetic brake
which is impossible to install with a fork shaped front gear strut.
I plan to cut one leg of the fork so i can make an offset strut and try to install the strut to the nose gear.
If i succeed then i will install the dreamworks main legs.
Chris

Ayrtonsenna

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# Mayday Mayday Mayday ##

Was hoping to bring two Baby Booma's home with me to New Zealnd from Australia, but the Elan has delayed the latest shipment to Intairco- Au.....arhhhhhhhhh! [:@]
With only having having a few weeks togo before heading home.............I need to find two- new Baby Boomas???????
I wanted to try and stear around "Freight-Tax" hence bringing them home with me!!!!

Any ideas....

Cheers

nt flyer

Hi Ayrtonsenna. Did Peter say when the Boomers are due? I have my name on one of them, and can't wait for it to turn up!

Cheers,

Greg

Ayrtonsenna

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Hi Greg,
I managed to speak to Peter yesterday- (he's on holiday in Tasmania)
He hopes to be back in the office on wednesday, and may know alittle more- ( "The Arrival Date" )
I said I'd give him a call at the end of next week.

It really sounds like he's been given the run around by the company that produce the kits- and yes, the Elan- has held
up everything!.............theirs not much he can do!

Peter as always is doing his best!......................but I'm running out of time!

Ants

hendrix

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Another great day.
It looks like the nicks did not played any role.
The landings are great but i had do increase down elevator to 30% when i activate crow braking
otherwise the plane balloons up a little during the transition.
After it looses speed i need to hold much up elevator in order to land smoothly.
It seems that i only need much down elevator until the plane looses enough speed.
The ideal would be to give 30% down elevator when crow is activated and then go down to 20% after the plane looses enough speed.
I guess it depends on the CG and the amount of up aileron during crow.
Chris

highhorse

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I've only used crow a couple of times, but 30% seems like a lot !?

Personally, I would not want to have to "hold" in a bunch of up elevator during final approach. I would find it distracting.

I wonder if you'd be better off w/ less elevator mix and simply waiting till you are slower before applying the crow?


I'm working furiously on my XL, and will need to go thru all of these decisions myself soon. I hope.