Messages

1

Slope Soaring / Quark 2M - Back to cutting innocent trees!

« on: June 21, 2012, 07:18:59 AM »

Hi again,
i maidened my Quark last weekend and it flies great! Well, I started with the CG a bit too far back - this was not really funny, but with a bit more lead in the nose the Quark flies just perfect. Inverted loops are great, and rolls are incredibly fast with 35mm on the ailerons.
The only problem I found was the speed limit. Yesterday flying in 14m/s wind with strong thermal activity was really fun, the plane also accelerates very well, but suddenly the rudder+elevator caught a really bad flutter. The lightening holes in the tail of the fuse make the structure too soft and the whole tail starts twisting. so no fast flying with those holes. I will reinforce the holes with some 3x0,5mm CF rods glued across.

The Quark makes a beautiful whistle on fast aileron rolls, while being absolutely quiet on straight flight, really great fun! I will post some pictures and maybe a vid too as soon as i get them...

2

Slope Soaring / Quark 2M - Back to cutting innocent trees!

« on: June 13, 2012, 21:50:12 PM »

Thank you,
I've got HS85 MG on the ailerons and Spektrum A4000 for rudder and elevator.

Weather forecast for the weekend looks promising... :twisted:

3

Slope Soaring / Quark 2M - Back to cutting innocent trees!

« on: June 12, 2012, 10:33:24 AM »

Another Quark is ready for maiden!

Although I didnt finish it before the weekend it was no problem - the weather was very british in Donovaly so absolutely no flying! Instead I took my time to get a good covering job and I am very pleased with the result (but it was three evenings work to get it all done - covering can be very time consuming... :?: ).
AUW is somewhere around 1,4kg, dont know where all the weight came from, but I also needed more lead than initially assumed... But for a fully sheeted wing and a sheeted stab it is OK, 1,2kg should be possible if desired. As I don't really like to fly in light wind I plan to add some kind of ballast to get it up to 1,8kg for the heavier days. And the stabs and wings/ailerons are really huge...!

Waiting for good wind and weather now...

Fred: please keep us informed about the flaps/ailerons version...  

4

Slope Soaring / Quark 2M - Back to cutting innocent trees!

« on: June 05, 2012, 06:56:45 AM »

Hi again,
I've got a few questions concerning the setup.

Is 30mm up and down for the ailerons enough (as per plans)? I need to know if I have to sand the gap between wing and aileron wider, I get exactly 30mm down now...

And how do you set up your transmitter for the Quark - 4 axis, 3 axis like F3F, how much aileron up/down for thermal and speed flight...?

Thanks

5

Slope Soaring / Quark 2M - Back to cutting innocent trees!

« on: June 04, 2012, 12:33:16 PM »

I ordered white, silver and two shades of blue - I think I will make this one white as base colour and some kind of patterns in lux and medium blue...

6

Slope Soaring / Quark 2M - Back to cutting innocent trees!

« on: June 03, 2012, 08:23:09 AM »

Got a lot of work done yesterday, right wing is ready for cutting the ailerons, left wing needs sanding of wingtip and LE... I chose the old version of the wing with cutting the ailerons after sheeting all together. In my opinion this method is better to get wings and ailerons straight. Another modification i made is longer wingtips (~ 6cm), if it doesnt fly well with them I can still cut them off. But I find it more practical for handling on the slope and it looks nicer :wink:

Today is sanding of the left wing and the fuse (with the nose block :shock: )...

Altogether a really great design and easy build, but you have to be careful and take your time for some details to get a perfect result. With those huge moving surfaces warping could screw up all the work... From my experience aerobatic airplanes need the most precision to fly well.

7

Slope Soaring / Quark 2M - Back to cutting innocent trees!

« on: June 01, 2012, 13:13:14 PM »

Yes, the elevator is with ribs and 1mm sheeting - really easy to build.

I've got one wing almost done (needs only some sanding at the LE and wingtip), when i put it on the scale I couldnt believe it: 225g with one servo and fully sheeted! Really very light, the fuse with the stabs comes in at ~430g. I didnt really try to build light, but it comes together very well. AUW around 1,2kg should be possible (I will see how much lead will be necessary...)

I hope to have it done until next weekend for my trip to Slovakia - it would be great to maiden it at Donovaly, a great slope!

I'll post some more pictures when I come home...

8

Slope Soaring / Quark 2M - Back to cutting innocent trees!

« on: May 30, 2012, 15:09:44 PM »

Hi,
here are the first pictures of my build - all goes together really well. Fuse is not rounded yet. The elevator turned out really good, 44gr both halves together. I built the rudder with 3mm parts sheeted with 1mm, it is really stiff now but still very light.
The most annoying part of the build was sanding down the 3mm carbon rods to fit into the tubes - the inner diameter was 2,8 instead of 3mm :!:

Waiting for the 8mm carbon tubes now to start the wings...

9

Slope Soaring / Quark 2M - Back to cutting innocent trees!

« on: May 26, 2012, 12:45:38 PM »

Hi again,
i already started the fuse - build is really simple compared to some other projects i built. The only thing i was thinking about was top and bottom sheeting of the fuse and balsa grain direction. Will the construction be more rigid with cross or straight grain balsa? In the curved front sections cross grain would also be much easier to bend...

10

Slope Soaring / Quark 2M - Back to cutting innocent trees!

« on: May 25, 2012, 15:00:27 PM »

Thank you very much for the information.

I will be building mine with balsa ribs too (only the 3 inner ribs will be plywood for more strenght around the wing joiner area).I can't wait building with balsa again, thats what i really missed when flying and repairing molded models....

And now i'm off to the hobby shop!

11

Slope Soaring / Quark 2M - Back to cutting innocent trees!

« on: May 24, 2012, 15:26:10 PM »

Hello,
I plan to start my Quark 2M build this weekend becasue i want to try something new on the slope...

The only thing i am not sure about is which servos to choose. The Ailerons are really huge (could be a problem for the standard HS81 with higher speeds?) and as this will be my first aerobat I don't know exactly what is more important - speed, torque, precision...? For my slope racers I never had to think about anything, the slim wing servos like HS125 were the only ones that would fit in.

So which servos do you use in your slope aerobats and what would you recommend?

Thank you