Author Topic: Flights of Fancy  (Read 30910 times)

TheLurker

  • Goes well with magnolia.
Re: Flights of Fancy
« Reply #150 on: April 26, 2020, 08:48:51 pm »
Well the Chiribiri isn't quite complete, but nearly there.  Cos I still haven't sorted out a image host here's a couple of film clips for you...
 
The first is a "walk around" of the C.5  ( https:// vimeo.com/ 412079449 ) and and there's also clip of the local Neighbourhood Watch ( https:// vimeo.com/ 412075421 ) coming home after having been out making very sure we're all observing the various distancing rules and that no-one is having any fun whatsoever:)

As seen the C.5 tips the scales at 9.79g.  I'm expecting an unballasted weight with rigging & trimmed prop. shaft v. close to , but a shade over 10g. The motor will be about 2g of strip.  The great unknown is the ballast, it's got a frighteningly short nose moment.

Sorry, you'll need to bolt the URLs together.
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Morat

  • I tried to HTFU but something went ping :(
Re: Flights of Fancy
« Reply #151 on: April 28, 2020, 05:32:44 pm »
To a layperson that seems remarkably light and fantastic workmanship!
Self Assembly URLs are very suitable for the thread ;)
Tandem Stoker, CX bike abuser (slicks and tarmac) and owner of a sadly neglected MTB.

TheLurker

  • Goes well with magnolia.
Re: Flights of Fancy
« Reply #152 on: April 28, 2020, 06:51:15 pm »
Quote from: Morat
To a layperson that seems remarkably light and fantastic workmanship!
I'll grant that it's light, but it's no better than journeyman standard workmanship.  If you want to see really good, museum quality, stuff head over to HipPocket Aeronautics builders' forum and look for stuff posted by g_kandylakis, zk-aud, dputt and mkelly (and others). 

On the lightness front. Set initial ballast last night and as expected for a short nosed subject it needs a lot, some 3.4g or about 30% of built weight. This is going to give a likely AUW (inc. motor) of ~16g.  Which means endurance won't be as good as the Lacey (upthread) which has a lower wing-loading but it should still be capable of a decent flight.



Quote from: Morat
Self Assembly URLs are very suitable for the thread ;)
I know they are an utter pain in the arse, but whenever I've embedded them in a {url} tag they don't render in the posted message.  Just pretend you bought them at Habitat/IKEA*. :)

Lurk.


*Delete according to age.
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TheLurker

  • Goes well with magnolia.
Re: Flights of Fancy
« Reply #153 on: May 01, 2020, 08:27:36 pm »
Finally sorted out some image hosting, but the img tag isn't playing nicely with the URLs, or vice-versa.

Assembly complete.
Built weight  10g
Ballast          3.4g
Expected initial AUW  15.5-16g

https://ibb.co/Q8vrC7X
https://ibb.co/q7VGKrB
https://ibb.co/YWQPNBt
https://ibb.co/ydCfzw1
https://ibb.co/zm10xck
https://ibb.co/nLG9pYs

Now all I need is a bit of very calm, dry weather to trim it.
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Kim

  • Timelord
Re: Flights of Fancy
« Reply #154 on: May 02, 2020, 12:18:31 am »
Finally sorted out some image hosting, but the img tag isn't playing nicely with the URLs, or vice-versa.

[...]

https://ibb.co/Q8vrC7X

You need to link to the image, not a web page containing the image:



Careful, Kim. Your sarcasm's showing...

TheLurker

  • Goes well with magnolia.
Re: Flights of Fancy
« Reply #155 on: May 02, 2020, 08:22:05 am »
Finally sorted out some image hosting, but the img tag isn't playing nicely with the URLs, or vice-versa.

[...]

https://ibb.co/Q8vrC7X
You need to link to the image, not a web page containing the image:
Ah. Yes.  Shows you how long since I last mucked around with image linking doesn't it?  Put it down to old age and general idiocy.
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TheLurker

  • Goes well with magnolia.
Re: Flights of Fancy
« Reply #156 on: May 14, 2020, 06:29:45 pm »
Not my flight of fancy. Far more amusing and interesting than anything I could do and deserves wider circulation.

HPA thread>  https://www.hippocketaeronautics.com/hpa_forum/index.php?topic=25187.0
Read the opening post if nothing else.  It will explain the video links below.  I defy you to not have a silly great grin on your face after you've watched the films.

The videos
1) https://m.youtube.com/watch?feature=youtu.be&v=CkoMshwo2JI
2) https://www.youtube.com/watch?v=esR9zl2xpSE&feature=youtu.be
3) https://www.youtube.com/watch?v=iTAvtBKf1LE&feature=youtu.be
4) https://www.youtube.com/watch?v=OMytBO7_Yrs&feature=youtu.be
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nicknack

  • Hornblower
Re: Flights of Fancy
« Reply #157 on: May 14, 2020, 06:42:33 pm »
Not my flight of fancy. Far more amusing and interesting than anything I could do and deserves wider circulation.

HPA thread>  https://www.hippocketaeronautics.com/hpa_forum/index.php?topic=25187.0
Read the opening post if nothing else.  It will explain the video links below.  I defy you to not have a silly great grin on your face after you've watched the films.

The videos
1) https://m.youtube.com/watch?feature=youtu.be&v=CkoMshwo2JI
2) https://www.youtube.com/watch?v=esR9zl2xpSE&feature=youtu.be
3) https://www.youtube.com/watch?v=iTAvtBKf1LE&feature=youtu.be
4) https://www.youtube.com/watch?v=OMytBO7_Yrs&feature=youtu.be
Indeed.  ;D
There's no vibrations, but wait.

TheLurker

  • Goes well with magnolia.
Re: Flights of Fancy
« Reply #158 on: May 23, 2020, 09:59:32 pm »
Τα πιο όμορφα ταξίδια γίνονται με τις δικές μας δυνάμεις - Φίλοι του Ποδήλατου

Re: Flights of Fancy
« Reply #159 on: May 23, 2020, 10:27:35 pm »
What an absolute delight. I watched the first four a week or so ago and it's all just plain (plane!!) wondeful.
Miles cycled 2014 = 3551.5 (Target 7300 :()
Miles cycled 2013 = 6141.4
Miles cycled 2012 = 4038.1

TheLurker

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Re: Flights of Fancy
« Reply #160 on: May 25, 2020, 03:10:25 pm »
After Pete's lovely films, back to The Potter's Wheel...

A long time ago (summer 1973 if you must know) a young (difficult to believe, but yes he once was) Lurker built his first ever flying model. Keil Kraft's Minimoa.  It didn't fly very well, but it did fly so here we are again.  This is a scaled down version.  The world and her brother have created any number of 100" span RC Minimoas for slope soaring.  I wanted one for which I had house room, about 34" span, for Free Flight bungee launching. So after some considerable faffing around in Inkscape redrawing formers, rib profiles and whatnot I've got a plan.  All that remains is to see whether or not it's buildable and will fly....







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Re: Flights of Fancy
« Reply #161 on: May 25, 2020, 09:28:22 pm »
My favourite glider ever. So beautiful.
I think you'll find it's a bit more complicated than that.

TheLurker

  • Goes well with magnolia.
Re: Flights of Fancy
« Reply #162 on: June 10, 2020, 10:51:03 pm »
Quote from: pcolbeck
My favourite glider ever. So beautiful.
Agreed, it is lovely, but, of the pre-war sailplane designs, it's worth noting that it was the DFS Weihe & Meise (Olympia), especially the Olympia, that got built in numbers after the war.  Apparently that gull wing was a swine to build; there is a rearward sweep / twist as well as the anhedral bend in the spar of the full size version which made it costly.  It's also a bugger if you use the Keil Kraft cracked spar approach in a model .  I've used the cracked spars for this shakedown to see what sort of weight the wings would turn out to be.  They're both 4g +/- so the wing has been re-drawn as a two part assembly, one extra rib and some glue isn't going to make a significant difference in the AUW and it makes it very much easier and less stressful to build.

Wings more or less complete.  LEs to sand to profile & stbd root bay needs sheeting.


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Re: Flights of Fancy
« Reply #163 on: June 11, 2020, 01:31:14 pm »
I keep meaning to have a go at this card and paper version you can download:

http://www.fiddlersgreen.net/models/aircraft/Minimoa-Sailplane.html
I think you'll find it's a bit more complicated than that.

TheLurker

  • Goes well with magnolia.
Re: Flights of Fancy
« Reply #164 on: June 15, 2020, 08:40:32 pm »
Quote from: pcolbeck
I keep meaning to have a go at this card and paper version you can download:
http://www.fiddlersgreen.net/models/aircraft/Minimoa-Sailplane.html
Their card aeroplane models look rather fun.

Right.  Airframe complete, 21g by the kitchen scales.  Probably still needs a teeny wee bit of rhinoplasty, but that can wait for a day or so.  Another short nosed subject so am expecting a significant amount of ballast will be required.  The next one is definitely, well maybe, going to  have a nice looong nose, hmmm mebbe a MiG 3. :)


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Re: Flights of Fancy
« Reply #165 on: June 15, 2020, 09:28:24 pm »
Look no further (it's not like you could see over the nose, anyhow...): https://en.m.wikipedia.org/wiki/F%2BW_C-3605

Re: Flights of Fancy
« Reply #166 on: June 15, 2020, 09:31:01 pm »


That looks lovely. 

I haven't made any balsa models for many years.  Hmmm.

TheLurker

  • Goes well with magnolia.
Re: Flights of Fancy
« Reply #167 on: June 16, 2020, 05:40:17 am »
Quote from: Jakob W
...it's not like you could see over the nose...
Oh my. Close kin of the Pilatus Turbo Porter? :)

Quote from: tom_e
I haven't made any balsa models for many years.  Hmmm.
I'll just leave this, https://www.vintagemodelcompany.com/model-planes.html, here shall I? :D

If you are tempted to get back into "toy" aeroplanes and aren't enough of a masochist to draw and cut everything from scratch then look at laser cut kits.  They are just astonishing and the saving in time is significant.  E.g. the former and rib prep. for the Baby Minimoa took some 10 or so hours where for an equivalent laser cut kit it would take ummm 5 to 10 minutes to sand back the lands/"sprue" of all the parts.  And part fit?  Breathtakingly good.  A good* kit just plugs together. VMC's are particularly good, especially their brand new designs.

*There are some stinkers out there.
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TheLurker

  • Goes well with magnolia.
Re: Flights of Fancy
« Reply #168 on: June 26, 2020, 09:33:26 pm »
Here we go, one "Baby" Minimoa, 34" span, Free Flight.  Will it fly?  I really don't know.  I do hope so.

Tips the scale at 25.5g unballasted, requires about 7g ballast to balance at about 50% of root chord.

Those who know the design well will spot the obvious scale inaccuracies, a couple of which I may deal with if it flies but on the whole it is sufficiently "ish" for me.

The scheme is an approximation to that of BGA 1639 which was (probably) built in 1939 as Werk Nr. 378, imported from The Nederlands (PH-390) in about 1970, and restored in the early 1980s.  The prototype BGA 1639 is nearer a cream colour than pure white, but given the "ish" nature of the design white is a variation I can live with.





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Re: Flights of Fancy
« Reply #169 on: June 26, 2020, 09:51:54 pm »
Nice job.I hope it flies as well as it looks.
I think you'll find it's a bit more complicated than that.

Re: Flights of Fancy
« Reply #170 on: June 30, 2020, 04:38:33 pm »
Lurker have you seen this?:

https://youtu.be/EcJ038TLG5Y
I think you'll find it's a bit more complicated than that.

andytheflyer

  • Andytheex-flyer.....
Re: Flights of Fancy
« Reply #171 on: June 30, 2020, 07:32:38 pm »
Or this.....

https://www.youtube.com/watch?v=KNHLJVRzJKY

I have no idea how he does this..................

I had about 9 models flying at any one time, and my garage ceiling was chock-full with racks. The real danger is hangar rash, inevitably you damage something just by getting it out and putting it away.

TheLurker

  • Goes well with magnolia.
Re: Flights of Fancy
« Reply #172 on: June 30, 2020, 08:05:02 pm »
Ahhh, big, expensive toys for the big boys.  None of yer bodging at the dining room table there and the Minimoa slope soaring video?  Not envious at all.  No, no, no oh dearie me no.

Mind you here at the shallow end of the pool it's an awful lot cheaper.  By way of example, the bill of materials for the Baby Minimoa is :

One sheet 3" x 36" x 1/16" med. balsa
One sheet 3" x 36" x 3/32" med. balsa
A few square inches of hard 1/16" balsa sheet.
A few square inches of 1/16" ply
A couple of cubic inches of block balsa.
One and a tiny* bit sheets of white tissue
An offcut of black tissue
An offcut of red tissue
About three inches of 22SWG piano wire.
One yoghurt pot lid.

All yours for under a fiver and you'll have nearly two half sheets of balsa left over for the next one and I rate the Minimoa an "expensive" model compared to a slab-sider.

*Have you any idea how galling it is to find you can cover everything from one sheet apart from one side of the stabilizer?  :)
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TheLurker

  • Goes well with magnolia.
Re: Flights of Fancy
« Reply #173 on: July 12, 2020, 02:11:02 pm »
Ah well, looks like mine's a dud.   Have managed to get a small handful of acceptable flights out of it, but it is very, very fussy about the launch off a bungee which makes it NBG as a fun flyer for me.  It might work better off a towline, where you have a bit more control, but that requires ground-crew and I haven't got any. 

Have tried a few tweaks to hook position and some gurney strips on the stab to improve longitudinal stability which have at least improved the stall recovery but it's persisting in dropping its nose off the tow which throws away all that carefully accumulated height.  Shame really because when it goes right it the glide is rock solid.

As I expected it is a very light airs only machine which further limits its usefulness as a fun flyer.

As usual, bolt the URLs together.

Test Glide
https://vimeo.com/ 437462829

Qualified Success.    Managed to some better than this, but of course didn't film those.
https://vimeo.com/ 437460888


Pull Up. Pull Up. Pull Up.  Terrain.  Terrain.
https://vimeo.com/ 437461961

There have been rather a large number of wince inducing flights where the pilot was unable to pull out of the dive. 
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Re: Flights of Fancy
« Reply #174 on: July 12, 2020, 03:08:55 pm »
Is it stalling at the top of the launch?
I think you'll find it's a bit more complicated than that.