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Author Topic: Lilienthal glider  (Read 2925 times)
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Sky9pilot
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« Reply #25 on: October 07, 2013, 10:52:53 PM »

Kewl Pete!

Tom
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« Reply #26 on: October 08, 2013, 05:27:52 AM »

Very nice. Like a spiders web of stick and tissue. Love it.
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Tim
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« Reply #27 on: October 08, 2013, 05:47:50 AM »

That's incredible Pete!  Cool
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Pete Fardell
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« Reply #28 on: October 08, 2013, 08:03:13 AM »

Thanks guys!
Ribs now on, and they do give the wings a more authentic curve and I like the way they show through to the underside, just like the original.
My dilemma now is whether or not to steam the Esaki to shrink it a bit. As you can see from the first of these pictures, it is still rather baggy. On the other hand I don't want to warp the thing beyond redemption. Also, not sure whether to glue the entire length of the ribs to the tissue, rather than just spot gluing to the spars as it is now. What do you think?
Pondering how much rigging to add too, if any at all. The real one had rather a lot but I'm worried about increasing the drag and it should still look okay with 'imaginary' wires I think. I'll put in the two king posts at least.
Weight so far, by the way, is just under 7g.
Will make the tail next, probably with the tailplane enlarged a bit.
Attached files Thumbnail(s):
Re: Lilienthal glider
Re: Lilienthal glider
Re: Lilienthal glider
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yagua
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« Reply #29 on: October 08, 2013, 10:15:48 AM »

LOVELY!!!! Now I´m tempted to do another one, but a flying one, like yours!! (yes: I´m about to copy you!!  Roll Eyes)
IMHO: don´t shrink the tissue. As it´s imposible to stop the shrinking at some desired point, most likely it´l curle those lovely wing ribs!!! :'( :'( (but then again: I´m a model builder, not a FLYING model builder  Roll Eyes)
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Rich Moore
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« Reply #30 on: October 08, 2013, 04:35:23 PM »

Yep, that's looking really nice.
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« Reply #31 on: October 08, 2013, 04:48:41 PM »

Looks great Pete .... I think you could be in trouble if the tissue is shrunk though  Undecided
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Pete Fardell
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« Reply #32 on: October 08, 2013, 06:22:41 PM »

You're probably right. I may make a test piece and just see what happens if I just lightly waft it through some slightly humid air.
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Sky9pilot
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« Reply #33 on: October 12, 2013, 08:15:46 PM »

Stunning!  What delicate and graceful looking model.  Best of luck getting this beauty in the air.  Thanks for sharing this build.

Tom
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« Reply #34 on: October 16, 2013, 05:38:41 PM »

Thank you.
Well I made a small 'dragon wing' and tested the shrinkage/warp potential in steam from my kettle. It went quite well (pic) , so I have done the same on the real wing with no disaster and the tissue is now a bit tighter.
Tail surfaces made with laminations bent around a former for the fin, and just around pins for the tailplane. The tailplane is enlarged a bit width ways, but not too noticeably unscale. To build in some trimming power I've hinged the fin where it fixes to the tail boom. I used a bread-tie for this, first wrapped in gluey tissue to make it stick to the wood better.
Attached files Thumbnail(s):
Re: Lilienthal glider
Re: Lilienthal glider
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Pete Fardell
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« Reply #35 on: October 17, 2013, 05:15:04 PM »

Here it is with the tail on. I've not fixed the tailpane yet as I'm not really sure whether to tilt it. The prototype has a lot of negative incidence, but my instinct is to start with it flatter.
Otto himself is next. If I ignore the various jobs I'm supposed to do whilst my wife's at work tomorrow then I might just get him done,which would mean I could try a few test glides at the Manc Velodrome on Saturday.
Who else is going?
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Re: Lilienthal glider
Re: Lilienthal glider
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danmellor
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« Reply #36 on: October 17, 2013, 05:23:30 PM »

Just fantastic, Pete!
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yagua
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« Reply #37 on: October 17, 2013, 05:50:35 PM »

out of words...  Shocked Shocked Shocked
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« Reply #38 on: October 18, 2013, 11:47:43 AM »

Otto sort of made. I can't really get him as far forward as I'd like because to remain in a scale position his torso has to be behind the cross piece. He's made of polystyrene, Depron and tissue and even with a hollow body weighs about 6g before painting. I wouldn't mind this, but I reckon only his boots are really in front of the required cg.
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Re: Lilienthal glider
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Laurence Marks
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« Reply #39 on: October 18, 2013, 01:41:09 PM »

Really very nice Pete... Even if it doesnt fly its a work of art...
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Rich Moore
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« Reply #40 on: October 18, 2013, 01:45:33 PM »

Excellent! He looks great.
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Pete Fardell
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« Reply #41 on: October 18, 2013, 07:50:13 PM »

Thanks chaps! Ready for first tests tomorrow. My main worry is the wobbly bendiness of the tail boom. It will probably need thickening but we shall see.
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Re: Lilienthal glider
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Re: Lilienthal glider
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skycafe
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« Reply #42 on: October 18, 2013, 10:09:49 PM »

That is an amazing creation.  I have watched this take shape over the last several days with a growing sense of awe.  Congratulations!
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« Reply #43 on: October 19, 2013, 06:33:07 AM »

I'm having twouble scwaping my jaw off the fwoor Shocked Cheesy!  WELL DONE and good luck with the flight (fwight?) twaining.

A few words of caution, NEVER, EVER "ignore" SWMBO's "job list"!  You might be able to squirm out of not having done the jobs by attempting to explain that you "misplaced" the list, or the dog ate it, or the cat shredded it, or... Wink

Pete
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« Reply #44 on: October 19, 2013, 07:05:13 PM »

Pit, I didn't really squirm out of the jobs list of course- the jobs were somehow done too! Although I was quite proud of the fact that I still found time to finish the glider, DESPITE it being our wedding anniversary!

Anyway, initial glides at the Velodrome today were quite nice. Here are a couple of examples. A bit short and steep perhaps, but then the real Lilienthal gliders only managed a glide ratio of about 1:3. (I say 'only' but clearly the man was a genius).
We later got a good bit of height by towing him up on a line. I found I only needed to run quite slowly (the only way I CAN run, truth be told). No video of this method from me, though Tim H got a bit of footage which he'll post when he gets time I expect. Many thanks to him and to Reg Boor who expertly released Otto for the tow launches.

http://www.youtube.com/watch?v=rJgfDSEhapI
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cvasecuk
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« Reply #45 on: October 20, 2013, 05:04:49 AM »

That is amazing. Well done Peter
Ron
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DavidJP
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« Reply #46 on: October 20, 2013, 06:01:24 AM »

Spiffing....... absolutely spiffing.  Now really must attend the Indoor Nats.  Been meaning to for a while.

David.
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Pete Fardell
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« Reply #47 on: October 20, 2013, 07:43:43 AM »

Here are the links to Tim's videos of two the tow launch trials. Many thanks Tim! (and to Reg Boor on launch duty)
Room for improvement in both the release and glide but you can see that it was quite easy to get some height (Don't worry though, the potential for an impressive pratfall into the spectators is still quite high).
http://www.youtube.com/watch?v=bm4NXzO7zLg&feature=c4-overview&list=UU5sJUguiU5oH325uHNgM4Hw
http://www.youtube.com/watch?v=gI-j3eKmH-g&feature=c4-overview&list=UU5sJUguiU5oH325uHNgM4Hw
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Laurence Marks
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« Reply #48 on: October 20, 2013, 08:37:35 AM »

Increasingly impressive Pete... 
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« Reply #49 on: October 20, 2013, 08:53:58 AM »

Excellent! The whole thing, both the glider and Otto look very cool.
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