Quark 2M - Back to cutting innocent trees!

[Fred]

:clap: Congratulations on the first flight Miki!!  :clap:
Glad you enjoyed it, and I hope this glider will give you many hours of flying plaisure!

For the flutter, strange, never had the case (or at least heard of it). I would have bet that the ailerons would flutter first  

I can't try on mine (no lightning holes on my fuselage), but I have to admit that I never pushed the glider hard speed wise (just some fast low pass, that's it), as I have to say that it was not intended for pure speed, but rather to keep constant speed during an aerobatic display (hence the good acceleration, thanks to the profile etc   )

I have checked my fuselage last night, and tried to twist it by hand, but that was almost impossible. With the openings at the back of the fuselage, that should be also hard to twist  :?:  (mainly because of the 4 strips that act as a beam, supported by the former at the middle  :?: ).
Maybe some play in the elevator axle because of the carbone tube/rod?

Anyway, interresting! I guess I'll have to build a light fuselage to find out!!    

Please, post photos and videos of the first flight, really looking forward to it  

[alibodin]

My kit has arrived and looks good.

What battery do people use for theirs. Ideally I want 5 cell for 6volts. I have a 5 cell C type but it looks like it will not easily fit and be removeable.

Also what servos do people use will Hitec 85MG be OK for ailerons and Hitec 325HB for Rudder/ Elevator?

Thank you for your help.

Alistair

[Richard Boyd]

Hi Aliistair, I use a 6v 2200 battery you could go bigger as you will need some extra weight in the nose of the Quark.

[alibodin]

Thank you, what size cells is your battery and what shape? Need something to fit nicely and hopefully be removeable for charging and recycling as well.

Alistair

[Richard Boyd]

I think my packs are 4/5 A size and I have them in hump 3 base with 2 on top, I also have a pack  set with 5 in a row , both packs fit in the nose of the Quark. By the way my quark is a proto type and the factory quark has a longer nose piece so you may not need as much nose weight.

[alibodin]

Thank you Richard for that.

I will take a look and see what batteries I can find.

Alistair

[Richard Boyd]

Hi Alistair , I am only to glad to help you, you are really going to enjoy your Quark, its a brilliant glider  

Let us all know how your getting on during your build and upload a few fotos as you go along.

[alibodin]

All I have seen on the Quark is good. Kit looks good. I have ordered the CF tubes and rods, the wing and fuz sheeting, the fuz longerons and the wing leadinding edge and the wing false leading edge. Hopefully should arrive soon. Hump battery also ordered as is two bottles of thin Cyno.

The Fuz is different to the website, it is 3 pieces, front top and bottom and then a rear section. The balsa sheets for the fuz are below.



Hope to make a start soon.

Alistair

[Fred]

Hi Alistair,

Glad you received the kit    Hope you enjoy the build!

For the battery, on mine, I have a 5 cells 2200Mah, in 3+2 configuration.
As Richard said, the "New" Quark have a longer nose, so you should be able to fit the same, or bigger battery (longer as its configuration, like side by side cells etc).

To me, your servo choice is fine for the Quark

[alibodin]

Been busy building and just the covering to go.        



Alistair

[Fred]

Nice  
That allow you to choose your colour scheme!  
And careful, your wing is the wrong way around  

Actually, never tried, but might fly (fast!) with a bit of lead on the nose  :?:

Anyway, something to bring with you in the office  

[alibodin]

Wing is now right way round

Fin built, using jig from fuselage of Grunau Baby to ensure straight edge. Had to add some shims of 1mm balsa to get nice tight fit for the horizontal part of the fin.



Rudder also built though I had to make my own leading and trailing edges.



Also glued up the fuselage sides. Comes in 3 bits, fits together nicely.



Nearly done all I can as I am waiting for materials to arrive.

Alistair

[alibodin]

All the materials have arrived

Some questions if I may?

Rhetorical: Why when I buy carbon tube and rod are the rods slightly too big to fit?

How does one glue the carbon fibre tubes to the wing ribs for wing and tailplane. There is a small gap. Tack then with thin cyno and the expoxy or thick cyno?

Also how does one cut Carbon fibre and sand it down, I have heard it is nasty stuff. First time to use carbon fibre.

How long does the 8mm rod need to be for the main wing joiner, I guess the rest of the 1 metre after cutting of the bit for the rear wing joiner?

Thank you for any help on the above,

On with the fuselage now!

Alistair

[Richard Boyd]

Hi Alistair, you have answered all your questions lol
tack and then use 5min epoxy for wing ribs to carbon,
Use fine emery sanding paper to sand carbon and I cut with fine blade balsa saw, using pull back strokes.
It is very difficult to get accurate carbon, you have to pay extra cash for this, cheap chineese carbon is not accurate and also alot is not potruded carbon and is only carbon dust and glue mixed.

[alibodin]

Richard,

Thank you for confirming my suspicions.

Added all the 5mm (3/16) stringers to the fuselage sides and the tail plane ply.



Marked them so to avoid building two sides the same, whcih I have done before.

Need to modify ST1 and ST2 for my servos and a switch as well.

AListair