Ok forum members, as always, I’d like to draw on your knowledge and experience.
My Grunau baby 2 is pretty much complete (see photo) so starting to think about an autumn build. I was thinking of a WLM 1 but being a bear of little brain took ages to find that Vic Steel had already done a ¼ scale model (ideal) and that it had a foam wing (even better)! Now... I have two questions:
1) The plan clearly says ‘wings have 1 .3/16” sweep forward’ and indeed – the root chord ‘rib’ is drawn this way. I have had a look at a number of ‘3 view’ drawings online and also Martin Simons book and can’t see any evidence of forward sweep – all the diagrams seem to show a dead straight leading edge across the span. I don’t want to doubt Vic but wondered where this info comes from – can anyone confirm that the glider DOES have forward sweep?
2) 2) The wing plan is a bit sketchy – that is to say it is pretty much a sketch of the basic dimensions and has almost no other info (like a cross section of construction). The original glider has ‘slotted flaps’ and ‘slotted ailerons’. I’m not quite sure what these should look like and how they should work? I know what a frise aileron is and how it combats adverse yaw – is a slotted aileron the same? Can anyone supply diagrams as I’d like to cut the wing in the appropriate manner to include this – particularly on the ailerons. The flaps I’m less bothered about. I have found a couple of pictures on the internet of the underside of the wing and clearly the flaps and ailerons have ‘gizmos’ to hold them in place and hinge them – I’m happy to replicate this with 1/16th G 10 plate but still need to know what I’m doing.
Any insights would be welcome!
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WLM 1
- Peter Balcombe
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Re: WLM 1
Nigel,
A slotted surface has a gap between the wing and leading edge of the surface, through which air can pass in order to give a stream of air over the top of the surface when deflected.
See diagram example & photo.
A slotted surface has a gap between the wing and leading edge of the surface, through which air can pass in order to give a stream of air over the top of the surface when deflected.
See diagram example & photo.
- VinceC
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Re: WLM 1
Here are a few photos to help you out, including an original brochure with a 3-view and original Blue Print of the wing
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- Baby Brochure.pdf
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- VinceC
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Re: WLM 1
sorry Vince - I think I'm causing confusion here - the GB 2 is pretty much done - its the WLM1 I'm trying to get the info on!
- VinceC
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Re: WLM 1
Sorry, I should take more care reading. I have this pdf which shows no forward sweep and an extract from a book which you can copy the sexy and put through Google Translate
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- WLM Model.pdf
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- 2018-08-14-0002.pdf
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Re: WLM 1
Thanks so much - great info and pictures - and entertaining at the same time! Unless I unearth Vic's 'source' of leading edge sweep forward, I will go with a straight leading edge. Thanks again.