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.

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

Very observant of you Sahil

This is a truly wonderful radio, with every possible feature except one - model naming. I can only give model numbers from 0-9. As I have only 6 receivers, this has never been a problem.

HiTec reliability is legendary. I have this radio since 5-6 years, although I have only been using it regularly since I returned to the hobby about 1 1/2 years ago. I have never had a single glitch or problem with it and the range is easily beyond the range of vision of a 40 sized model; about 1.5 Km +.

I have an Optima 6 & Optima 7 with telemetry (which I don't use - the sensors are too expensive)

I also have 4 clone receivers bought from Hobby King. They too work perfectly, are only about $20-22, but don't have telemetry. These are manufactured by FrSky. They give the same range and reliability as the Optima Series.

I have not used the Minima. I bought my Radio set and Optima receivers from rc4all, Chennai. I understand the range of the Minima is 400 metres, which although much lower, should be adequate. But the clones from HK were just so much cheaper and work fine too! No problem with Customs also - I got them by registered air mail, one at a time. Never paid duty or had any issues

Incidentally, I am using the original NiMH cells which came with the radio. 4-5 years old, but work fine. I get about 1 1/2 - 2 hours actual flying time, which is more than enough for me. Only thing is they tend to self discharge when the radio is idle. For that I have got 6 LSD NiMH from HK (the Tx is a 7.2 V system) but haven't yet installed them as the old ones are still going strong

Hope she survived up elevator recovery from inverted...
The problem with doing manouvers three mistakes high is that i can't quite see what happens...

Yes, the three mistakes high rule.

Frankly, I was flying < 1 mistake high. I do these things on other models too, this being a different and much faster model I was flying about 3/4 throttle, or about 70 Kmph. Came out of a knife-edge, I did get unsighted - at a distance the top and bottom wings look similar, thought it was straight and gave up elevator. Unfortunately it was inverted - famous last words 

IMHO the biggest damage was to my battery - a 30 flight old 3000 mAh Zippy LiPo 

I'm repairing it, will be able to do so, but my repairs are not that good and the models are never quite the same 

@sanjayrai55
Sir,
Lance's post today on the same subject:
http://www.rcindia.org/rc-maneuvers-and-skills/parkzone-26xp-tutorial-how-to-knife-edge/msg201974/#new
Many near misses!

Yes sir, saw it 

Nice One Sanj... As usual superbly built plane that looks good too.... Tempted to build one.. Would love to build a plane with you one day.. it would be fun; you make it look too easy!

Safe landings..

Thanks Dee

Hi sanjay,

Even i got my stuff Hitec stuff from Rcforall, they have very competitive pricing or better than international sites even with all the free shipping, discounts and coupons  . Minima's are full range receivers without telemetry.
http://hitecrcd.com/files/2.4GHzOptimaManual.pdf

Binding process

Good to have alternate receivers for Hitec 2.4Ghz especially in the micro rc range.


That's great news 

Update:

After repair the QB 20 is back! Flying just the same as before 

Awesome plane.

Thank you Nitesh   How is your flying getting on?

Sir, I have not flown still my pa is not getting time to take me to the field.

Reincarnation 

Nose Art 

Wow that looks good and LOL sir That nose art.
to the master builder
Regards,
Aman.

And now, rebuilt again in a new Avatar

Excellent sir 

Looks awesome... really great work  very beautiful..

Thanks Doc 

Thanks Sharlock 

 

Please also post more coro planes that you have build

Most of them are already here; both in Electric & Nitro. Do a search eg " sanjayrai55 electric''

Rai sir excellent work done 

Link to gallery

https://postimg.cc/gallery/e9yfdgb0/