SLINGSBY DART 17R 1/3 SCALE

cw · Posté le: 08/07/2008 22:59 Sujet du message: SLINGSBY DART 17R 1/3 SCALE

I am building a 3rd scale version of the Dart 17R from my 1:3.5 scale plan, hopefully for Retroplane 2009...

1:3.5

1:3.5

3rd scale: building the spar. The Dart has 2 wing panels, but they are too big for my small workshop. So, I am building the wing in 3 sections, a la Skylark 4. The spar for the centre wing panel has 12 x 6mm spruce each side of a central 1.5mm ply web to form a classic 'I' beam

Checking the fit against the centre fuselage formers...

Laurent Beldame · Posté le: 08/07/2008 23:55 Sujet du message:

Quite promising Mr Williiams.......should be even more forgiving than the Skylark 4 (if you remember some comments heard at the Schweisel) Wink

Cheers

cw · Posté le: 09/07/2008 00:12 Sujet du message:

Laurent, there were many comments made at the Schweisel, which ones do you mean...? Confused

Laurent Beldame · Posté le: 09/07/2008 09:31 Sujet du message:

...the one for which the consequence was to have your transmitter landing in my hands to fly the Skylark...nice souvenir Wink

L

Walter · Maniaco Posteur Inscrit le: 05 Nov 2006 Âge: 46

..."Quick Chris" is here... Wink

Hello Chris,

...welcome to the retroplane forum - good to have you and your phantastic planes here...

I hope I will meet you in Ireland 2009!
Last November I found the book from M. Simons about the Slingsby sailplanes in a book store in England - I was very happy to get it!

Can you please post some technical datas from your Dart. Especially what weight do you expect - and secondly if possible - what is the weight of your Skylark...?

Thanks a lot
Walter

cw · Posté le: 09/07/2008 22:59 Sujet du message:

Laurent, it took a lot of time to get the transmitter back from you...! Laughing

Walter, the new Dart will span around 5.6m and weigh 11-12kg
The wing section is HQ 35/15 at the root, tapering to 35/12 at the tip. There will be no wing twist or washout

The Skylark, at 1:3.5 scale weighs 8Kg and spans 5.2m

patte de loup · Posté le: 16/07/2008 23:19 Sujet du message:

Welcome on the forum Chris. Enjoy to read your new building . Very Happy

Nice to see you once again for Retroplane 2009. Wink

Pat'

cw · Posté le: 16/07/2008 23:46 Sujet du message:

Merci Pat...I hope you all had a good time at Retroplane 2008

Now, the 1st stages of the fuselage contruction...

Chris Ze Swiss · Posté le: 17/07/2008 22:58 Sujet du message:

Hello Chris!

I remember, last year, at the Rétroplane meeting, when I was helping pilots to carry their equipment from the car terminal until the slope, I came to you singing "If you want somebody, call my name", "remake" from Sting! Laughing

What a good time there!!!

Nice to meet you on this forum! Very Happy

Waooooo! Nice and fast construction!!! [clap]

Read you soon!, Christian

cw · Posté le: 19/07/2008 18:54 Sujet du message:

Hi Christian, nice to meet you again...!

Now we must build the wing centre section to work out how to best attach it to the fuselage...

cw · Posté le: 20/07/2008 21:40 Sujet du message:

Using a template to check the fidelity of the airfoil...

The rear of the ribs are reinforced with 0.75mm plywood

Now it is time to put fuselage and wing together

Laurent Beldame · Posté le: 20/07/2008 22:28 Sujet du message:

Good evening m'sieur Williams

One simple and innocent question:
The ribs of your wing seems to be mounted in a vertical way like the real thing I guess ; how can you ensure that there will be no twist at the end ?

I assume that the main factor depends directly from the quality of cutting of all pieces but .... [humm]

Merci

L

cw · Posté le: 21/07/2008 00:19 Sujet du message:

Laurent...it does not matter if the wing is twisted at this stage. It will twist easily if you apply pressure to it. Once the bottom sheeting is added it will only become rigid when the top sheeting is applied, then you will see what happens... Wink

cw · Posté le: 21/07/2008 23:18 Sujet du message:

Hah! I forgot to take the photos of the next stage Embarassed

So, here is the Skylark centre section, which is very similar...

As you can see, the wing rests on supports shaped to the bottom of the wing to keep it all straight...

Once the white glue has set, the wing will then be rigid

cw · Posté le: 23/07/2008 23:12 Sujet du message:

Back to the fuselage now...

The internal structure is braced with 6mm sq. balsa diagonals to prevent twisting during the sheeting process...

3mm sq. spruce reinforces the fuselage at the rear where the ply will have to be joined

The top .75mm plywood sheeting is soaked with water and heated with a domestic iron to take out some of the tension when it is glued to the fuselage...

12mm balsa sheet taped to the bottom longeron keeps the fuselage straight as the ply is glued in place...