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1/4 Scale Salto

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Cliff Evans
Posts: 662
Joined: 29 Dec 2019, 15:13
Location: Bristol
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Re: 1/4 Scale Salto

Post by Cliff Evans »

This is GlidresUK!

Screenshot(2).png


Ebay seller details:


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https://lasercutsailplanes.co.uk
https://patteaklegliders.co.uk

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mjcp
Posts: 175
Joined: 29 Jul 2015, 08:14
Location: A wind swept hill with no wind, in driving distance of Windsor, UK
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Re: 1/4 Scale Salto

Post by mjcp »

I started my build with the tail plane, the idea being I can get my eye in and if I lunch it, a recut would be less of a bent to the wallet than a set of wing ribs and skin!

Stb ruddervator 1st off the plan, followed by the Port one. Eye mostly in.
IMG_1924.jpeg

Bit of doubling ready for the hinges - This was my 1st moment of insecurity: allowing for the skin, the LE and TE were still higher than where the skin would end up. Eventually I worked up the courage to assume it would need to be sanded back to profile, hence the doublers look way taller than needed in the pic.
IMG_1927.jpeg

Skinning was a non event, but the next step had its own set of nerves. The TE is a combination of stock TE and additional stock to fill in a narrow wedge as the chord increases towards the fuse / root. In the end, some odd bin stock was glued and with the aid of some packing tape (to protect the TE that didn't yet need adjustment) and a (Messrs. Heath, Robinson patented) flat sanding sheet did the job.
IMG_1932.jpeg
IMG_1933.jpeg

A quick trace of the plan, cut to a template and then attacked with the bandsaw resulted in the desired plan form control surface. This was marked and then fettled with a block plane borrowed from the other side of the workshop to get the root to tip taper correct, with suitable graduation along the profile.

Meanwhile the balance tabs were formed from two cross grain thicker balsa sheet offcuts. (Looks like the LE had seen some profile work by this point too!) The tabs were rebated to match the bevelled profile of the TE and to offer a larger surface area for the joint.
IMG_1934.jpeg

Next up, the balance tabs* were blended to the control surface / TE profile in the same packing tape masked / sanded way. Then the LE / body of the tab was profiled to match its ruddervator. (Here's a before and after)
IMG_1937.jpeg

1st side done, boundary between the ruddervator and the balance tab was faced with 0.4mm ply
IMG_1935.jpeg

And its pair.
IMG_1940.jpeg

Hand aligned, I'm happy with the two faces, they will be straight and close by the time the hinges get involved.
IMG_1942.jpeg

A pair of ruddervators.
IMG_1943.jpeg

The servo hatches have also been cut on the rear. Servos will be HiTech HS-125MGs all round unless anyone else has any thoughts?

*Balance tabs - not sure what the name of the bit ahead of the hinge is called on a "horn balanced" surface (I've never heard it called a horn!) and balance tabs tend to be on the TE...

n.b. happy to shift to a sep. thread to avoid hijack if the powers that be prefer?

Marc.
m̶j̶c̶p̶ Marc

Hanger -
Some (now) pristine models that are un-flown for a year.

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Cliff Evans
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Location: Bristol
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Re: 1/4 Scale Salto

Post by Cliff Evans »

Looks good Marc.
https://lasercutsailplanes.co.uk
https://patteaklegliders.co.uk

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Cliff Evans
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Joined: 29 Dec 2019, 15:13
Location: Bristol
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Re: 1/4 Scale Salto

Post by Cliff Evans »

The new Pat Teakle Salto flew today for the first time. New wing section HQW 2.5/12. Flew faultlessly off of the tow, just needed to calm the surfaces down a bit but yes, a great success.

20210529_160132.jpg
https://lasercutsailplanes.co.uk
https://patteaklegliders.co.uk

Mike F
Posts: 68
Joined: 18 Mar 2015, 14:08
Location: Gloucestershire

Re: 1/4 Scale Salto

Post by Mike F »

Hi Marc

Great to hear that the Salto has flown. Love the training edge brakes.

Mike

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Cliff Evans
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Joined: 29 Dec 2019, 15:13
Location: Bristol
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Re: 1/4 Scale Salto

Post by Cliff Evans »

Mike F wrote:
30 May 2021, 10:58
Hi Marc

Great to hear that the Salto has flown. Love the training edge brakes.

Mike
Its Cliff, not Marc!
https://lasercutsailplanes.co.uk
https://patteaklegliders.co.uk

roo Hawkins
Posts: 875
Joined: 18 Mar 2015, 20:12
Location: Northamptonshire

Re: 1/4 Scale Salto

Post by roo Hawkins »

I cliff well done with the maiden .just need to fly mine. Will be off the slope.

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