Mike,
It’s all about driving a large fuselage through the air. The quite small size
difference between say, a Discus A and B fuselage makes an appreciable
difference in performance, particularly at higher speeds. Compare the massive
size difference between an ASG 29 and a two seater fuselage. I don’t know what
the actual drag figures are but they must be a large difference. Likewise the
two seater ASH 25 and Nimbus 3DMs and 4DMs are left far behind the ballasted 18
metre gliders when the speeds get up a bit. The actual Arcus fuselage is very
similar to the 20 year old Nimbus 3D fuselages so I guess there was not much
scope to improve them much.The Jonkers JS fuselage is reputed to be an exact
copy of an earlier German glider. Actually expected the new Schleicher 32
fuselage, being a new design, to have lesser drag but the information from
Finland is not indicative of a substantial improvement. Time will tell. Am sure
you could give us some useful information on drag calculations,
Harry Medlicott
From: Rob Izatt
Sent: Saturday, July 12, 2014 7:09 PM
To: Discussion of issues relating to Soaring in Australia.
Subject: Re: [Aus-soaring] 20M gliders
You can get two people in a two seater and share the fun which is the
wholepoint of said two seaters. Without handicaps glider comps would be even
less viable.
On 12 Jul 2014, at 5:59 pm, Mike Borgelt <mborg...@borgeltinstruments.com>
wrote:
From what has been written here over the last few days, it is disappointing
that a new flapped 20M two seater doesn't have as good performance as a 15M
unflapped glider.
Mike
Borgelt Instruments - design & manufacture of quality soaring instrumentation
since 1978
www.borgeltinstruments.com
tel: 07 4635 5784 overseas: int+61-7-4635 5784
mob: 042835 5784 : int+61-42835 5784
P O Box 4607, Toowoomba East, QLD 4350, Australia
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