Scratch built from plans available on outerzone.co.uk

Designed by the master Y. Matsumoto, this was in response to the sad end of another super Matsumoto-of-Pilot-Models design, the Zattack based on his Attacker 28.

Brief specs:

52"span, AUW of 1350 grams including 3000 mAh 3S LiPo, DYS 3536-1250 KV motor, 40/50 A ESC, 10*7 e-prop.

Happy Birthday Sanjay Sir. Wish you many more.  Happy flying & Happy landings.

Thank you so much Colonel saheb

Only one pic in the build log - testing the wing incidence. (It was about 1.5 degrees positive, so I left it as it was)

Maidened it this morning

Field pics

The model flies beautifully, and hardly needed any trimming.

Having a shorter fuse and smaller wing area than the Zattack (QB is 52" span, Zattack is 49") the model is nimble, responsive and quick. At a pinch I would say the Zattack is more stable, and the QB 20 is more aerobatic.

Video is uploading (870 MB  ) Will post once it is done

Video. Had a strong cross-wind today, but the model generally managed fine

 

sir please explain how angle of incidence meter work and any such type of meter available in local market to calculate throws ,thrust line angle ,is water level is used to calculate the referance line for incidence angle.

 

too good as if on rails. Perfect .

Thanks Vin, Sundaram sir

The Incidence Meter is described here: http://www.rcindia.org/tools-materials-and-building-techniques/wing-incidence-meter/

The level is used for levelling a datum or reference line, though when just checking wing incidence with respect to horizontal stab that is not necessary

Happy B Day Sir.

Thank you

Real Master of Coro.  
Love the details like the wing mounting bolts that don't need a screwdriver, tailwheel assembly, Allen bolts for u/c, tiny hold down screws for hatches...
I notice that you seem to have standardised your production technique so that it is easily repeatable.
Hope you also post your builds on RCG for international audiences.
And Many Happy Returns of the Day.

Flying beautiful sir,  {:)}Some beautiful low pass.

Quote from: K K Iyer on November 07, 2014, 12:27:26 PM
Real Master of Coro. 
Love the details like the wing mounting bolts that don't need a screwdriver, tailwheel assembly, Allen bolts for u/c, tiny hold down screws for hatches...
I notice that you seem to have standardised your production technique so that it is easily repeatable.
Hope you also post your builds on RCG for international audiences.
And Many Happy Returns of the Day.

1. Thank you sir
2. Thanks again. In fact some of the screws are self tapping screws through the corro into the wood below for the Firewall, LG Plate, and wing bolt-down blocks
3. I am trying to standardise. I don't design: I only take an existing design in Balsa/Nitro and try and adapt to Corro/Electric. Soetimes, surprisingly, it works 
4. Not RCG. I do post sometimes on spadworld.net, but that group is not as poular nowadays as it was 5 years ago
5. 

Thanks Manoj 

Many many happy returnes of the day sanjay sir very nice build sir one question all coro is 3mm? Once again very good build  

Happy birthday sir

today I learn something new I know it was there but do not know the exact method to measure incidence thanks for the link its helpful

I download a simple app on my nokia which calculate angle with reference surface I think (jugad) it can work in place of
Robart Incidence Meter   
(as seen from photo taken from net)
hope such app are available on anroid also)

Gaurang, 

I would normally use 4 mm for the fuse, tail and ailerons, and 2 mm for the wings. However since 4 mm is not available since some time I used 3 mm. The fuselage has doublers of 3 mm from nose to just behind the wing

Vin, thanks 

That app should work as an inclinometer - you would still have to make the rest

Sir,
No problem due to that sharp leading edge?

That, Iyer sir, is the wonder of SPADs! 

Initially I used to put a lot of effort in rounded LE's. Then I found it didn't make a difference 

A lot of other interesting things too. Leave the wingtips open. Same difference.

Rounded Wing LE


(Most) Everyone at the field freaked when they saw the fin was on one side, and thought it would roll and spin around. But, no, it flew straight and true

Hi sanjay,

I can see from the pictures that you use Hitec optic6 2.4Ghz ? which receivers are you using (minima or optima) and how are they performing. Any interference or etc issues ?

Sahil