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4.5:1 ASH-25

Let us all watch your new project progress.
roo Hawkins
Posts: 831
Joined: 18 Mar 2015, 20:12
Location: Northamptonshire

Re: 4.5:1 ASH-25

Post by roo Hawkins »

Just looked at my DG 800 'part kit', 1/3rd scale with epoxy fuz and foam cores that I bought in Germany in the late '80s
I think the dg 800 was only built in 1993

Pete Marsden
Posts: 29
Joined: 17 Mar 2018, 08:45
Location: Southampton

Re: 4.5:1 ASH-25

Post by Pete Marsden »

Could be, I used to go every other year up to the turn of the century.
Could even be a 600? I've no plan. (DG's aren't my cup of tea - bad experience with the Robbe- '100)
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John Vella
Posts: 241
Joined: 20 Mar 2017, 22:09
Location: UK

Re: 4.5:1 ASH-25

Post by John Vella »

Pete, that fuselage is a DG600. It is slimmer than the 800 . Regards John.

Pete Marsden
Posts: 29
Joined: 17 Mar 2018, 08:45
Location: Southampton

Re: 4.5:1 ASH-25

Post by Pete Marsden »

Talk about measure twice, cut once!
I've just cut the first pass at the wing using the dimension written on the plan in scrap foam (fortunately!) - they bare no resemblance whatsoever to the ASH wing.
No matter how I interpret the written figures or the dimensions shown in plan view, the L.E. sweep + chord sections gives a rearwards sweep at the tip.
I've had a Mate carry out a cold-eyes review in case I'm truly going barmy but he came up with the same results.
Fortunately I do have the catalogue of the full size so I'm going to use their plan view. Although this can in no way be perfectly accurate the numbers I came up with do look right in the STEP-4, pity I didn't study the STEP-4 more carefully before cutting! (this showed the T.E. error).
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Peter Balcombe
Posts: 1143
Joined: 18 Mar 2015, 10:13
Location: Clevedon, North Somerset, U.K.

Re: 4.5:1 ASH-25

Post by Peter Balcombe »

Pete,
The Martin Simon’s Sailplanes 1965-2000 has a 3 view of the ASH25.
I could scan & send if you get stuck.

His drawing shows a root chord of 850mm, chord of 340mm at end of outer aileron (without winglets).
By eye, it looks as if the LE has a slight sweep back from just inboard of the airbrake (outboard end of inner control surface), whilst the TE sweeps forward from the same point.

Pete Marsden
Posts: 29
Joined: 17 Mar 2018, 08:45
Location: Southampton

Re: 4.5:1 ASH-25

Post by Pete Marsden »

Peter,
That's very good of you but I think I'm OK(ish).

I have a large plan view (A1) which confirms the chords shown on the drawing that came with the fuz., but the sweeps are completely different. Hopefully this won't be too far out.

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