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Speed Twin ST2 - a twin-engined kit build

1/7 scale and 45

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Tim Hooper25/02/2012 21:06:52
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2840 forum posts
2357 photos

Have a peek at the YouTube video, and tell me that this isn't a spectacular little aeroplane......

 Speedtwin

I first became aware of this lovely 26' craft due to a posting on this very forum, and it soon earned a place on my 'to do' list!

Searching the net revealed lots of photos, but no 3-view.

As the ST2 is currently in production, it made sense to contact Speedtwin Developments themselves. I talked to their very helpful MD, Malcolm Ducker, and explained the situation in order to gain his permission to emulate his product in balsa at 1/7 scale.

Despite not having a suitable 3-view, Malcolm has furnished me with the general dimensions, and I've run a ruler over the photographs and come up with the following outlines;

(That little Turnigy outrunner looks lost in the nacelle, doesn't it?)

Profili software has generated a set of aerofoils. I've plumped for a 12% E207 section - a semi-symmetrical profile to give good aerobatic performance.

 

Rapid Models has supplied me with twin Turnigy powertrains, and four metal-geared servos.

I've got lots of head-scratching and pencil work to do before I start to cut balsa, it's true, but starting the build thread this early is a major motivator for me.

Anybody fancy one of their own? 45" span, 400 watts total from a 3S pack.

timwink

Edited By Tim Hooper on 25/02/2012 21:07:52

Edited By Steve Hargreaves - Moderator on 14/03/2012 08:55:58

Stefan Hafner25/02/2012 21:20:35
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382 forum posts
15 photos

At that size you won't be replicating little mini rudders under the fuselage then??

Should be a cracker though

Tim Hooper25/02/2012 21:25:41
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2840 forum posts
2357 photos

Stefan,

They certainly won't be functional, that's for sure! I gather that they're remote aerodynamic balances for the ailerons.

tim

Danny Fenton25/02/2012 21:28:50
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8857 forum posts
3707 photos

should be good to follow along, nice one Tim smiley

Cheers

Danny

Nev25/02/2012 21:37:39
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592 forum posts
221 photos
Always fancied having a go at a twin, this looks perfect. Very interested in this one
Tony Bennett25/02/2012 21:40:00
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4986 forum posts
129 photos

yeah i like the look of that myself.

laugh

Tim Hooper25/02/2012 21:44:56
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2840 forum posts
2357 photos

Thanks guys!

I should just point out that Rapid Models are not sponsoring me with motors etc. To answer a query just made, I pay full retail price for their products and use them as I see fit.

tim

Seamus O'Leprosy25/02/2012 22:13:08
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842 forum posts
115 photos

I would prefer something arounf the 65" span

Ton van Munsteren26/02/2012 16:05:30
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1271 forum posts
3291 photos

Tim,

Nice will make a lovely model with good flight performance.

Seeing it made me at first think that they would have done a scaled up version of one of your models which was not yet published.

Great vdo looks like the Pilot is having fun throwing it around and doing those passes.

What is the motor type that you selected and for what prop, is that the equal to a Typhoon 15/10.

Ton

Tim Hooper26/02/2012 18:11:51
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2840 forum posts
2357 photos
Posted by Seamus O'Leprosy on 25/02/2012 22:13:08:

I would prefer something arounf the 65" span

No problem Seamus. All you need is a big, blank sheet of paper, a ruler, a pencil - and away you go!face 23

Ton, Thanks for the comments! I did consider a pair of Typhoon 15/10's but the price was prohibitive, so opted for Turnigy D2826/10 1400kv units with matching Plush 25A ESCs.

Ton van Munsteren26/02/2012 18:47:33
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1271 forum posts
3291 photos

Nice motor Tim did read that it should do well on an 8x3,8 APC it pulls 650 gramms at 12.5 Amps.

Ton

Tim Hooper27/02/2012 11:09:10
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2840 forum posts
2357 photos

Ton,

The specs say around 200watts on a 7x4 prop, but I can always experiment a bit, can't I?wink 2

More drawing this morning, with the ribs drawn in, and the tail surfaces fleshed out with their internal structure.

tim

Steve Hargreaves - Moderator27/02/2012 17:33:12
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Moderator
6648 forum posts
182 photos

Just adding a post so I can follow along......this Tim Hooper bloke seems to know what he's doing so it should make a nice model.....teeth 2

Tim Hooper05/03/2012 21:36:32
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2840 forum posts
2357 photos

With the plans all fleshed-out.....

 

......it seems appropriate to start hacking some balsa into shape!

I don't have enough 1/16 sheet to do my usual thing and attack the wings first, but I do have enough 1/32 sheet, so on with the tail surfaces instaed!

Edit to correct picture spacing...

Edited By Steve Hargreaves - Moderator on 26/03/2012 12:35:20

Tony Bennett05/03/2012 21:42:29
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4986 forum posts
129 photos

you dont hang about do you.laugh

Tim Hooper05/03/2012 22:19:17
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2840 forum posts
2357 photos
Posted by Tony B on 05/03/2012 21:42:29:

you dont hang about do you.laugh

Actually, if the truth be known, I've felt rather guilty that I haven't been able to make quicker progress!

tim

Olly P06/03/2012 09:10:42
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3215 forum posts
181 photos

ahh...The list is already too long for my money, time and ability! Tim you're a pain with these nice, well designed models you keep doing!

Adrian Day07/03/2012 19:34:36
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351 forum posts
101 photos

following this one for sure looking good so far Tim don't take you long once you get your hands on a design..

how do you work out the dimensions to put it on a plan is there certain points that you work from.. to the the scale..??

Top marks so far will keep looking
Regards Adrian

Tim Hooper07/03/2012 20:49:45
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2840 forum posts
2357 photos

Adrian,

It's pretty labour-intensive, especially when there's no 3-view available!

I work from 2 critical dimensions - the span of the full-sized aeroplane, and the span of the proposed model, which gives me a scale to work to. The 26 feet span of the ST2 gives us a 1/7 scale 45" model.

For the rest of the dimensions, I have to rely on photographs and do my best to work it out from there! There's a fair amount of artistic licence being ruthlessly exploited in this particular case......blush

tim

Seamus O'Leprosy07/03/2012 22:09:24
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842 forum posts
115 photos
Posted by Tim Hooper on 26/02/2012 18:11:51:
Posted by Seamus O'Leprosy on 25/02/2012 22:13:08:

I would prefer something arounf the 65" span

No problem Seamus. All you need is a big, blank sheet of paper, a ruler, a pencil - and away you go!face 23.

What size ruler would you recommend and will a 3H pencil be ok?

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