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Chris Williams 1/4 Scale T21

Posted: 31 May 2019, 21:53
by Sean Fitzgibbon
So my Ka3 build is finally about to leave the building board to be covered. That means the next project needs to be planned and it's going to be the 4.1mtr T21 from Mr Williams.(He did tell me at MW that he hadn't actually built one himself, this is a scaled down version of his 1:3.5 prototype).
Still just at the stage of making lists of materials and enjoying the anticipation of seeing it grow in the workshop, anyone that has built one , please chip in with advice!

Re: Chris Williams 1/4 Scale T21

Posted: 01 Jun 2019, 08:33
by Rich vale
I have built four of them!!

Re: Chris Williams 1/4 Scale T21

Posted: 01 Jun 2019, 08:39
by Rich vale
The build is straight forward. The only problem that needs care is the covering of the ailerons and wing TE which twist very easily.

Re: Chris Williams 1/4 Scale T21

Posted: 01 Jun 2019, 10:58
by Sean Fitzgibbon
Rich vale wrote:
01 Jun 2019, 08:33
I have built four of them!!
That's just showing off!!
I'm hoping to start building towards the end of this month once I've gathered together some of the timber required. I have the laser cut pack from Sarik, so it's mainly spruce strip by the look of it!

Re: Chris Williams 1/4 Scale T21

Posted: 01 Jun 2019, 11:40
by chris williams
As long as the 'D' section has top & bottom sheeting and full-length ply webbing, it should be impossible for the wing to twist, although TE's can sometimes distort

Re: Chris Williams 1/4 Scale T21

Posted: 01 Jun 2019, 23:28
by B Sharp
Just like full size machine Chris!
Brian :)

Re: Chris Williams 1/4 Scale T21

Posted: 06 Jun 2019, 19:37
by jack
nice easy build,just lots of it ;) ,your biggest concern will be getting enough of your local church roof in the nose :lol: :lol: ,l actually found that l could get a pair of six volt spill proof batteries in the nose,one either side of the keel,the aerotow release went in the middle-if you need weight it might as well be useful wieght ;) ;) .....keep the tail as light as possible,every gram counts,have fun :D :D

Re: Chris Williams 1/4 Scale T21

Posted: 26 Aug 2019, 21:56
by Sean Fitzgibbon
Had a great weekend at the Nationals, a spot of preplanning meant I had emailed a list to SLEC to pick up.
Very efficient service as always, I now have the bulk of the required timber to press on with the T21.🤗

Re: Chris Williams 1/4 Scale T21

Posted: 07 Sep 2019, 18:41
by Sean Fitzgibbon
So, having glued together the parts to make up the stabiliser spar and the elevator leading edge, construction proper has commenced.
This began with adding the stabiliser ribs to the spar, which I decided to do vertically due the dihedral of the tailplane.

Re: Chris Williams 1/4 Scale T21

Posted: 18 Sep 2019, 21:57
by Sean Fitzgibbon
Steady progress, just finished fitting the diagonal ribs in the tailplane. My aim is to try and put at least an hour a day into this build in an attempt to maintain momentum.