Thermalling Primary Gliders

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I'm interested to know if primary gliders were capable of soaring flights or if they only flew short hops.

The SG 38, for example, has a sink rate of 1.3 m/s so in theory it's possible. I'd be very interested to hear of any stories about soaring one of these gliders.

[Chris Wedgwood[_2_]]

On Thursday, April 25, 2019 at 11:19:38 AM UTC+2, wrote:
> I'm interested to know if primary gliders were capable of soaring flights or if they only flew short hops.
>
> The SG 38, for example, has a sink rate of 1.3 m/s so in theory it's possible. I'd be very interested to hear of any stories about soaring one of these gliders.

Its certainly possible. We can do it in Condor, if the thermal is stronger than 2 m/s and the towplane drops you in the lift. Then you have the problem of getting to the next thermal at 8:1.

You 1.3 m/s sink rate is wrong for the SG38. Its actually 1.8 m/s min sink and 2 m/s at best glide.

[Martin Gregorie[_6_]]

On Thu, 25 Apr 2019 02:19:36 -0700, ashmanthefirst wrote:

> I'm interested to know if primary gliders were capable of soaring
> flights or if they only flew short hops.
>
> The SG 38, for example, has a sink rate of 1.3 m/s so in theory it's
> possible. I'd be very interested to hear of any stories about soaring
> one of these gliders.

Yes - a few years back I remember reading a story about one that was
thermalled as part its display in a Gemman airshow. The main problem was
that, without airbrakes, its pilot couldn't get it down and held up the
rest of the show for 45 mins.

Slipping it wouldn't help much because primary gliders have very little
side area and no dihedral.



--
Martin | martin at
Gregorie | gregorie dot org

[Soartech]

On Thursday, April 25, 2019 at 5:19:38 AM UTC-4, wrote:
> I'm interested to know if primary gliders were capable of soaring flights or if they only flew short hops.
>
With an 8 to 1 glide and sink rate of 255 fpm they would be very comparable to modern single surface hang gliders and they are easily soared often. XC flights of 100 miles or more have been done on such gliders by experienced pilots in good conditions.

[son_of_flubber]

On Sunday, April 28, 2019 at 4:21:48 PM UTC-4, Soartech wrote:

> With an 8 to 1 glide and sink rate of 255 fpm they would be very comparable to modern single surface hang gliders and they are easily soared often. XC flights of 100 miles or more have been done on such gliders by experienced pilots in good conditions.

A slow minimum sink speed allows a tighter turn radius to core very small thermals.

[Martin Gregorie[_6_]]

On Sun, 28 Apr 2019 15:13:12 -0700, son_of_flubber wrote:

> A slow minimum sink speed allows a tighter turn radius to core very
> small thermals.
>
Did you mean flying speed?


--
Martin | martin at
Gregorie | gregorie dot org