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Old Nov 02, 2002, 08:59 PM
IAD
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Beech Starship Under Construction

I originally planned to hold off on this posting 'til after the first flight, but... As you can see... I didn't.

I designed a 'very-near-perfect' scale Starship over the summer, based on a somewhat distorted 3-view I found (I have of course rectified the distortion...) and the framework is now nearly finished. It has/will have Fowler Flaps, mechanically sequenced nose gear doors, and scale var. geometry canard. To avoid tissue sagging issues, I plan to sheet most of the aircraft in 1/32" balsa, thus the light framework on the fuse.

Specs are as follows:

Wingspan: 37" +/- .5"
Wing Area: 160-190"^2 including canard, 240-280" with flaps extended, and canards in forward sweep. (Very approx. figures, the wing is a nasty thing to try calculating area on...)

Est. weight: 11-13 oz, RTF (The 13 oz figure is as bad as it could get, according to my calculations.)
Motors: 2x GWS Direct Drive, on 3"/2" props. (6-7 oz thrust, total)

Functions: Elevator, Ailerons, Throttle, Flaps/Canard sweep, Retracts (GWS).

Below is a picture of the craft as it is right now...
Please excuse the rotten image quality...

Luke
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More pictures to come...
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Old Nov 02, 2002, 09:04 PM
IAD
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Temporary double-wheel in the nose position... Testing the fit of the retract unit... This will be replaced shortly with the correct single-wheel unit. Note also the canard pivot, mounted with two ply plates and stablized with balsa uprights (the large objects up in the nose, visible in the other pictures).
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Old Nov 02, 2002, 09:06 PM
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A shot before I started the canards.
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Old Nov 02, 2002, 09:17 PM
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Picture of one of the Fowler (sp?) flap guide rails.


Close-up of canard, looking towards tip. The small foil coming off the elevator is a (non-functional) trim-tab.
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Old Nov 02, 2002, 09:38 PM
IAD
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Last one for now... Top view.
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Old Nov 03, 2002, 07:54 AM
IAD
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Well...
Just weighed the airframe, and recalculated AUW, and it looks like I could just manage 10.5 oz, if I am very careful. We shall see...
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Old Nov 03, 2002, 09:46 AM
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IAD,
The Starship is truly a beautiful plane, and you've done a great job here!

I do have a concern though. The wing is quite long and thin (chord wise) towards the tip, and at the spot I've indicated, I believe that the wing will twist in flight. If the leading edge tries to lift or drop (as it WILL do) then there is only a single strip of wood to prevent this.

Dennis-
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Old Nov 03, 2002, 09:57 AM
IAD
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Actually, I have built wings similar to this, (not this complex, but high aspect ratio) and 1/32" sheeting has always served me well... Also, the LE will be quite a bit thicker when I finish... The installation now is actually a sub-LE, to allow for sheeting... I plan 4-5 laminations of 1/16" for the true LE.
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Old Nov 03, 2002, 10:24 AM
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I live north of the Raytheon (Beechcraft) factory and saw the Starship in flight many times. Great subject for a model!
I think they couldn't sell enough to go into full production.

FWIW, it had a distinctive sound in the air, almost like the sound of a diesel truck on the highway as heard from a mile away.
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Old Nov 03, 2002, 10:28 AM
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Don't forget the five bladed props!!!
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Old Nov 03, 2002, 08:53 PM
IAD
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Haha, I wish..! Could use the GWS EDF 5 blade, unducted, I suppose... Too small, to be scale, though...
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Old Nov 04, 2002, 04:41 PM
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Splendid news... After much effort, I have finally rigged the main-gear retracts in such a way as it doesn't torque the frame apart when I extend the gear... (i.e. low friction linkage.) I had read some horror stories about the GWS retracts, but it seems that it will work well here. I do get the geometric lock at full extension, and retraction is complete.

Now to skin the wing...


Oh, the servo mounting/wheel is not the final version..!
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Old Nov 04, 2002, 04:44 PM
IAD
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Front view. I have checked, and the linkage does not deflect under load... At least in the 'lab' so to speak... In the field... Might be another story.
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Old Nov 04, 2002, 07:15 PM
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starship project

Hi Luke, This has got to be the project of the year! I sure wish you the best. I saw one of these things overhead once, and I always wanted to model one, but I never thought that I could make it work. You will have to give us a lecture sometime about how to locate the CG on a canard, I have never been able to figure it out. Best wishes! Gus Morfis
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Old Nov 04, 2002, 09:38 PM
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NO-STALL!

You guys realize that if he gets this bird flying right, it'll be virtually stall-proof, right? Aicraft with such aggressive canards enjoy this benefit, and I think that the folks at Beech/Raytheon were banking on selling that decreased risk to reduce corporate insurance, and that would be one of the many motivators for corporations to purchase the 1:1 model.

I've seen that bird in flight numerous times - completely unique and futuristic. Hope all the best luck in the world to the builder!
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