Grob SB's

On Friday, January 18, 2019 at 4:14:55 PM UTC-5, Martin Gregorie wrote:
On Fri, 18 Jan 2019 12:20:33 -0800, Papa3 wrote:

On Friday, January 18, 2019 at 6:02:45 AM UTC-5, Martin Gregorie wrote:


How much, if anything is there in common between the fixed u/c mounting
structure in a Twin Astir and an Acro II?

Just a thought inspired by the apparent ease with which the early
Libelle 201s could be converted from fixed to retractable u/c.



Completely different animals. A number of owners have investigated
this, and it's not a simple issue at all. The structure is completely
different as well as the mechanicals of the wheel, mounts, etc.

Fair enough. I've flown both Twin Astir and Acro IIs, so it seemed
possible that replacing the folding undercarriage with a fixed one on the
same attachment points would have been an easy job, and cheapish too,
since it could reuse tested structure in an, apparently, very similar
airframe.

I should have looked at Martin Simon's book "Sailplanes 1965-200" before
opening my trap: it describes a complex lay-flat retract system which
almost certainly could not have been easily replaced with fixed gear.
(Takes foot back out of mouth).


--
Martin | martin at
Gregorie | gregorie dot org

Actually, LTB-Lindner has very nice, dimensioned, 3 view drawings on the website. You can see for example that the width of the fuselage is slightly different, the depth is different, etc.

Very impressed by the support from LTB Lindner by the way; they have been responsive and very helpful.