Chris Williams 1/4 Scale T21

Let us all watch your new project progress.
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Sean Fitzgibbon
Posts: 73
Joined: 11 Oct 2017, 18:53
Location: Mitcheldean

Chris Williams 1/4 Scale T21

Post by Sean Fitzgibbon » 31 May 2019, 21:53

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!
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Rich vale
Posts: 59
Joined: 19 Mar 2015, 19:52

Re: Chris Williams 1/4 Scale T21

Post by Rich vale » 01 Jun 2019, 08:33

I have built four of them!!

Rich vale
Posts: 59
Joined: 19 Mar 2015, 19:52

Re: Chris Williams 1/4 Scale T21

Post by Rich vale » 01 Jun 2019, 08:39

The build is straight forward. The only problem that needs care is the covering of the ailerons and wing TE which twist very easily.
Last edited by Rich vale on 02 Jun 2019, 08:47, edited 1 time in total.

Sean Fitzgibbon
Posts: 73
Joined: 11 Oct 2017, 18:53
Location: Mitcheldean

Re: Chris Williams 1/4 Scale T21

Post by Sean Fitzgibbon » 01 Jun 2019, 10:58

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!

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chris williams
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Joined: 10 Mar 2015, 10:50
Location: Blandford Dorset

Re: Chris Williams 1/4 Scale T21

Post by chris williams » 01 Jun 2019, 11:40

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

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B Sharp
Posts: 602
Joined: 19 Mar 2015, 17:18
Location: Perthshire

Re: Chris Williams 1/4 Scale T21

Post by B Sharp » 01 Jun 2019, 23:28

Just like full size machine Chris!
Brian :)

jack
Posts: 62
Joined: 20 Mar 2015, 21:55
Location: chepstow,south wales

Re: Chris Williams 1/4 Scale T21

Post by jack » 06 Jun 2019, 19:37

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

Sean Fitzgibbon
Posts: 73
Joined: 11 Oct 2017, 18:53
Location: Mitcheldean

Re: Chris Williams 1/4 Scale T21

Post by Sean Fitzgibbon » 26 Aug 2019, 21:56

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.🤗

Sean Fitzgibbon
Posts: 73
Joined: 11 Oct 2017, 18:53
Location: Mitcheldean

Re: Chris Williams 1/4 Scale T21

Post by Sean Fitzgibbon » 07 Sep 2019, 18:41

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.
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IMG_20190907_174537915-2016x1512.jpg

Sean Fitzgibbon
Posts: 73
Joined: 11 Oct 2017, 18:53
Location: Mitcheldean

Re: Chris Williams 1/4 Scale T21

Post by Sean Fitzgibbon » 18 Sep 2019, 21:57

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.
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IMG_20190918_214919406-1612x1209.jpg

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