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Author Topic: Bungee Launch 36" Gliders  (Read 34423 times)
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Yak 52
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« Reply #150 on: November 06, 2013, 01:15:49 PM »

Thanks Peter, I quite like the look of the 1950 Archangel but it might be a bit fiddly at 36".
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PeeTee
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« Reply #151 on: November 06, 2013, 01:59:20 PM »

Jon

Unfortunately a lot of the interesting ones have fiddly construction - but I suppose it's a challenge. If you have a look at the November Clarion on the SAM 1066 website, you'll see that some people have been building a 36" Dream Bogey - it certainly looks different and has loads of wing area. Another one to put on the build list Roll Eyes

Peter
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Yak 52
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« Reply #152 on: November 06, 2013, 05:07:14 PM »

...some people have been building a 36" Dream Bogey...

Wow, that's my kind of airfoil  Grin  presumably with 1/32 sheet ribs  Shocked

I realised the other day that Geoff's Cirrosonic is 34" span so the 6" chord gives an aspect ratio of 5.66 - ie very low. I've scanned the plan, does anyone know if there are issues with uploading it to the gallery? I recall Phil Smiths family still have a commercial interest...?

On another note, I've started building my OD 36er - the 'Rumball Strip' Smiley
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Russ Lister
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« Reply #153 on: November 06, 2013, 05:16:39 PM »

Surely a copyright violation? ...... you've been 'rumballed'!  Wink Grin
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« Reply #154 on: November 06, 2013, 05:28:29 PM »

It was inspired by yours Russ (not meant to be plagiarism)
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« Reply #155 on: November 06, 2013, 05:34:32 PM »

Jon

Scaling down the Dream Bogey gives you ribs closer to 1mm, and I'd be inclined to use that (especially with my fat fingers). The foil looks like a thinned Marquardt, perhaps Dave took a typical lightweight rubber airfoil and stretched it Wink.

I look forward to seeing the O/D E36 (and to hearing how Russ's performed).

Peter
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« Reply #156 on: November 06, 2013, 05:39:28 PM »

Sorry Jon .... the humour doesn't come over in type again ... I was only having a laugh.
It was just a vehicle to work in the pun  Embarrassed
Dave will be doubly flattered I'm sure ... and I am flattered to think that I could inspire.
What's most important now is that you inspire us with another design  Smiley
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lincoln
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« Reply #157 on: November 06, 2013, 06:00:21 PM »

Sorry. Around here bungee and competition (in RC) just don't go together. All the competition flyers I know put the tow hook about as far back as it can go with good control, and so do I. Makes a big difference in launch height. I use the same position for my high start. When you do this, up elevator is not required. Some people put the hook so far back you need down elevator.

I guess a ff glider wouldn't behave with the tow hook set like that, but if it could behave, the launch would be higher.

I've heard of offset tow hooks. In a plan for the 40 inch Sinbad, they have a balsa gadget with a rudder on it that fits on two towhooks on the bottom of the fuselage to correct for the rudder offset on the model. The model releases from the gadget and the gadget comes down with the towline.
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Normally, if you put the towhook back far enough, you don't need any up elevator on a hi start launch

Lincoln

That is likely the case with sport RC soaring, but when timing I've stood behind competitors and watched them progressively feed in up elevator in order to stretch the bungy to the maximum. I don't believe that a single hook position will accommodate all windspeeds without some elevator adjustment if you are looking for maximum height gain on launch.

Anyway, we seem to be getting a bit off topic  Wink To turn to Isis's point about auto rudders, the same effect could be achieved with an offset towhook, and I seem to recall that our Australian chums provided information on these, either in this topic, or one of the others in Towline Gliders
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Yak 52
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« Reply #158 on: November 06, 2013, 06:01:52 PM »

No probs Russ.

Dave will be doubly flattered I'm sure ...

I think he may be getting paranoid by now  Smiley

Thanks Peter - I see now its scaled 0.6.

My OD is pretty boring, just a low aspect strip of ribs hence the name.
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« Reply #159 on: November 06, 2013, 06:16:47 PM »

I doubt that ... look forward to seeing it.
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Garry
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« Reply #160 on: November 23, 2013, 12:39:46 PM »

It's been quite for a while.

Here is my entry for the event.

Meteorite  by Vic Smeed as posted Outerzone

Garry
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Re: Bungee Launch 36" Gliders
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« Reply #161 on: November 23, 2013, 12:54:30 PM »

WOW...that is WAY cool...it captures the mood and style to a TEE....can't wait to see how it flies...
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« Reply #162 on: November 23, 2013, 01:15:31 PM »

Way to go, Garry  !    Nice airplane.

Looks  more practical than my oncoming airframe - wing and stab built, sides cut ....

JM
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« Reply #163 on: November 23, 2013, 04:21:56 PM »

All I have so far but the fuselage is likely to appear in the next week

Reminded myself ..   still have to put in a gusset at centre
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« Reply #164 on: November 30, 2013, 12:30:20 AM »

A few minor things to do before covering, not least whether to add an autorudder with some sort of gentle release system.    28 gms as is
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« Reply #165 on: November 30, 2013, 03:42:06 AM »

Nice bones!

-Paul
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« Reply #166 on: November 30, 2013, 06:14:06 AM »

YAOWZAA!  A Minimee " Walkin' Shoes"!  Hope it goes as well as the biggee Smiley!

Pete
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« Reply #167 on: November 30, 2013, 09:14:42 AM »

OH YA Jim...she really looks sweet...glad to see you building again and can't wait to see it in the air!!
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« Reply #168 on: November 30, 2013, 10:49:19 AM »

Hello,

After reading a couple of articles in aeromodeller recently I have become very interested in this 36 inch bungee glider thing. I have never flown free flight gliders before. I encounter references to "auto rudder" in the literature. What is auto rudder and how do you set it up? I am planning on building the spirit of ziac from the latest aeromodeller issue. Beautiful airplane. Would it be legal for competition?

Best,
Dave Semeraro
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Russ Lister
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« Reply #169 on: December 01, 2013, 04:38:14 PM »

Looks great Jim  Smiley

I'm not sure what rules apply to you Dave, so I will let someone else answer your question ... apart from saying that the Spirit of Zaic is a 'new' design as I understand so would not be be allowed in comps that do not allow new designs.
Looks a nice model though .... I liked Steve's contribution to the history of the Aeromodeller.
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« Reply #170 on: December 01, 2013, 06:51:12 PM »

The Zaic design is quite elegible for the 36" bungee glider event in the WorldWide Postal - and also for that to be held at the Great Grape Gathering at Geneseo in coming September

However I thought this design heavy and far more suited for the R/C option, than for F/F        There are better designs 'out there'
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« Reply #171 on: December 18, 2013, 09:34:49 AM »

I just ran across the Veron "Cirro-Sonic" on Outerzone.  Cute little buggar with a constant chord wing and a bit of undercamber, but "only" 34 inch span Roll Eyes.

Adding a set of ears and maybe a bit of a fuselage stretch, it would appear to make a nice F1H (A1).
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« Reply #172 on: December 18, 2013, 09:44:02 AM »

Saw that plan as well. It appears like a quick easy build and could be easily stretched to 36" span.
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« Reply #173 on: December 18, 2013, 10:16:14 AM »

A few minor things to do before covering, not least whether to add an autorudder with some sort of gentle release system.    28 gms as is

Jim,
Nice work as always. 28 grams?
Dave
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« Reply #174 on: December 18, 2013, 04:48:07 PM »

Looks good Jim, that's very light  Shocked


Pete, re the Cirrosonic have a look at post #135. Geoff's is stretched to 36" and built with tip panel dihedral instead of the straight V. Some of our chaps think that is better for stability on the bungee.


What is auto rudder and how do you set it up?

Dave, it appears no one answered this for you. Auto rudder is set up so that the rudder is straight while the model is on the towline or hi-start but when the towline drops off it deflects the rudder to make the model circle. The rudder is just a smallish trim tab usually spring loaded with a small rubber band. There are a few different ways to do it, this link will give you the idea:

http://www.theplanpage.com/things/Lulu/Mods.jpg

The other option is to offset the hook and oppose it with fixed rudder.
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