hey guys good news the video is up

come on why does it take long to buffer well i am even using video accelarator

Awesome plane chan bhaiya it looks awesome!!!!!!!!!!!!!!!! if the wind would have been less i think it would have been better i could hear the wind in the video

before you remove the vpp setup try it with the new battery and less wind and tell us how it worked please

a video of the same would be much much much appreciated 

Quote from: Pikle6 on May 30, 2009, 02:39:07 PM
before you remove the vpp setup try it with the new battery and less wind and tell us how it worked please

Hi Subramani,

I dont think another 40 gm difference in weight would really improve the performance.  So it is better that I change the setup and put this on a much lighter plane.

- Chan

hey why dont you try the 2826 it too has a 5mm shaft i know i am asking for too much. just a thought

I might try that!! But weight of the motor might be too much for the plane!

I am going to put a 2217 motor on it most probably.  Looking for 200W per 500 gms!! So i need about 175W.  I have decided on the Dualsky 175W motor or the 2217.  I personally feel that the 2212-13 might be a bit too small for it!! Let me get another video for you guys tomorrow!

- Chan

good choice that would be best as 2826 might bee very heavy you are right

Hi ,
There was another katana maiden today as well at the other end of Chennai .
Dont have any pics or VDO as I forgot to take the camera  

The same tech one Katana  was maidened today  with the following set up :

1) Turborix 1300 rpm/v Motor
2) RCFORALL DY 20 A esc
3) GWS 0947 prop with Prop saver

I tried  with three diff batteries :
11.1V 3 S 1350 mah
             1000 mah
               850 mah

The best performance was with 850 mah

Chan the performance of this plane dramatically improves with a lighter wing loading .

This plane did  harriers , Rolls , inverted harriers , Loops ,Cuban 8 , stall turn , immelmen  you name it it was done today including 3 D  but the only issue with 3 D was  could not hold .
Mind you all this was acheived with  a 21 gms 1300 motor .

So I would say I will not go with anything more than a 50 gms motor  at the outer limit .
The recommended motor is a 2208  so any set up in excess of 50 gms would be counter productive as per me.
rgds
sai


Sai

hey chan bhaiya this is a 47 gms motor with a good KV it is - 2212/6 and i have used it in my f22 with custom ducting. only problem i find is that do you have a 3mm hollow shaft and other than that i think it it could be helpful

hey just calculated it gives 10.8*22(peak amp) = 237.6 W that might be good enough i believe

hi Chan bhaiya i think the above recommendation might work your planes weight comes to around
506 gms i just calculated

all weights are in gms

260                           (katana body without motor)
80                             (Battery well i calculated for 1000 mah 3s lipo might be lesser for 850 mah)
24                             ( 4 6gms servo each for rudder pitch elevator and ailerons)
47                             (2212/6 motor)
25                             (esc)
20                             (Rx)
50                             (something i missed out and push rods and extension cables,etc)

Total = 506gms of your fully loaded plane

and as i suggested it gives 237.6 W

and from lesson about how to calculate motor you said

175 to 200 W per 500 gm for a 3d plane as its 4d i think the extra 37.6 W would do the job

awaiting your reply

correct me if i am wrong

just want to help and see that thing fly and do a inverted hover 

And one lesson I learnt is that we have to record the interesting bits of action with the aircraft being close to you !  For a hover move, please ensure the ground (or horizon) is also visible in the video frame, so that we can fully appreciate the move !

Please pass this on to who ever is manning the camera when you shoot this.  We are all eager to see this in action 

Hi Guys...

Today.. I put in a 2217/06 motor spinning a 10x4.7 onto the Katana.  It is a 200+W motor and 70gms.  Hell it was heavy but the performance was PHENOMENAL!! Take off was at quarter throttle.. Hovers were at less than half throttle.. Got a video but no ground perspective except in some frames.  Was doing pretty low hovers and piloting the plane towards me on these hovers!! But at one particular hover, the ESC cutoff.. A low level hover + ESC Reset + Tarmac Kissing = TOTALLED PLANE!!! Had a ESC cutoff and the plane came down pretty heavy for about 5 to 6 feet and the nose was totally smashed!!  And it was also very windy!! I pushed limits today!! Check out the video!!



Hi Subramanian,

The 2212-06 motor is more suited for pusher jets and it is a high rpm motor.  This means that you would generate the watts required but the prop that it can take is very small.  I cannot spin a 10" prop on that and 3D requires spinning huge props at low rpm!! The 2212-13 is more suited for this kind of flying!!

And I think you have grossly miscalculated the planes weight!  The Katana with the VPP setup and a 1350 mAh 3s Lipo with all the works built in weighed 450 gms!!  With the 2217, I must have reduced another 20 gms!  So 200+W on a 400gm plane is rock solid power!!

Thanks for the suggestions though!!

- Chan

Hi Chan ,
Looked at the VDO  just adding my 2 penny bit here . I think the very high nose loading that could be the cause .
As I have mentioned earlier anything more than a a 50 gms motor stuck up there could be the cause of the sudden dip on the ESC reset. especially considering the plane seems to have been just getting into head wind when it went down.

The Katana this side of town flew great with the under powered set up , we were able to achieve  around 30 + secs of prop hang  at height of around 10-15 ft from the ground , but  rolls at around 5-6 ft height were possible today despite strong winds .

Sai

Yeah uncle..definitely true..As we increase the noseweight and the wing loading, however balanced the plane is, the stall speed increases... So the plane stalls at a much higher speed than before!! And landings should always be with power or it is asking for trouble!!  In my case, if I had altitude, I could have dived to gain airspeed, but here it was not possible!! And the crash was 90 deg crosswind!! The wind was 90 cross on the runway and the plane was parallel when it crashed! Next would be EPP on my part to keep the weight low and use the VPP again!

- Chan