John Slater Airspeed Tern

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John Slater
Posts: 43
Joined: 24 Mar 2015, 07:29
Location: Dudley , West Midlands

Re: John Slater Airspeed Tern

Post by John Slater » 15 Aug 2019, 08:16

Hi Barry,

Re wing construction, I think most modellers have their own method, but if it helps this is my method.

Firstly with all the ribs available I construct the main spar, this can be done nice and straight on a good building board.

The spruce top and bottem pieces are clamped or pinned to the board I then add the vertical webbing to one side but only at every other rib spacing, ie. rib 1 to 2, 3 to 4, 5 to 6 and so on, the wing joiner is not fitted at this stage. when this is done the spar can then be lifted and positioned on the plan again keeping everything vertical straight and true, the wing construction can then begin.
I then slot each rib into the spar at the rib space and rotate it into position against the vertical webbing, 2 ribs into each space can be fitted, ie. ribs 2 & 3, ribs 4 & 5, and so on, rib 1 the root rib is not fitted at this stage but when the wing tip can be elevated and then it can be set at the required angle.
When fitting the ribs you must make sure to align the front and rear of each rib, and pay due attention to creating the washout at the tip rib.
The wing leading and trailing edges then fitted.
The remaining vertical webbing can be added and the wing joiner fitted and boxed in by setting the tip at the required height and using a spirit level to keep the joiner level before the ply `D ' box sheeting is applied.
This is a brief summary of my method and hope it is of help.

Kind regards

John

Barry Apostolou
Posts: 16
Joined: 07 Jun 2019, 15:36
Location: Surrey

Re: John Slater Airspeed Tern

Post by Barry Apostolou » 15 Aug 2019, 15:04

Thank you very much John.

It will be of great help when I start the wings. I take it from what you say that the wing joiner box in the wing is set to ensure a dead level joining section for the stainless strip to go in, thus making the top of the wing dead straight.

I hope to start the wings sometime next week, I have been out today flying at Butser Hill (Petersfield on the A3) on a very blustery westerly wind, in the region of 15-20 mph, it was great fun. There was a good turnout of around 15 people there flying all sort of models, The Club that run the site is the Meon Valley Soaring Association (MVSA), I have been a member for quite a few years now, they also have westerly and northerly sites as well.

Thank you for taking the time to help it is appreciated,

All the best

Barry A

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