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Author Topic: Bungee Launch 36" Gliders  (Read 39611 times)
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Yak 52
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Jon Whitmore



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« Reply #425 on: May 22, 2021, 06:29:12 AM »

Fuselage just about done, the wings were covered a few years ago Roll Eyes  The pod is just sheet sides and blocky bits with a glass fishing rod for a boom. Probably overbuilt at 24g.

Might actually get it done for Tuesday if I extract digit.
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Yak 52
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Jon Whitmore



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« Reply #426 on: May 22, 2021, 09:44:01 AM »

Pod covered in black domestic tissue https://www.hippocketaeronautics.com/hpa_forum/index.php?topic=25823.msg274666#msg274666
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PeeTee
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« Reply #427 on: May 22, 2021, 09:51:27 AM »

Hi Jon

Are you putting the fin on the top or on the bottom of the boom?

Peter
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Yak 52
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Jon Whitmore



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« Reply #428 on: May 22, 2021, 10:14:46 AM »

On the bottom Peter. A decision I made ages ago for some reason - easy DT for the tailplane I think. I did look at moving it forward and putting it on the top but it then didn't quite work in terms of tail length and volumes.

I think Hepcat recommended 'area low aft' as good for line stability at some point too.

Jon
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Russ Lister
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« Reply #429 on: May 22, 2021, 12:55:54 PM »

That looks great Jon  Smiley ... reminds me of the Mercury Gnome a little.
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gliderpilot2
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« Reply #430 on: May 23, 2021, 05:38:55 AM »

Would like to attend the mentioned 'Peterborough Ferry Series competition next week' -
is an events calender available online with dates please?

Paul
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Yak 52
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« Reply #431 on: May 23, 2021, 07:11:26 AM »

Would like to attend the mentioned 'Peterborough Ferry Series competition next week' -
is an events calender available online with dates please?

Paul

Hi Paul,

Where are you based?

The series is four or five monthly dates over the summer on Tuesdays or Friday afternoons but is not widely advertised as it's just a competition for PMFC club members. The dates are on the events calendar on our website: http://peterboroughmfc.org/calendar.htm If you are interested in joining (well worth it!) or attending as a guest give the CD John Ashmole a call - his details are here: http://peterboroughmfc.org/contacts.htm

We also have the Flying Aces meeting in late summer (12th September) which is open invitation (BMFA Insurance required)


That looks great Jon  Smiley ... reminds me of the Mercury Gnome a little.

Cheers Russ - it's a pretty bog standard BLG36! But low aspect ratio is a nod to the successes of Gnome/Corsair/Cirrosonic. I designed this so long ago that I would do a fair bit differently now - but I thought it worth finishing as I should still learn something from it.


Jon


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Russ Lister
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« Reply #432 on: May 23, 2021, 01:47:39 PM »

Ha .... you don't do anything bog standard, Jon .... look forward to seeing it in action  Smiley
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gliderpilot2
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« Reply #433 on: May 23, 2021, 02:50:05 PM »

Thank you Jon,

Far side of Leicester, just over an hour away from Ferry Meadows,
I have been to meetings in the late 90's and remember well your wonderful Flying Aces in September meetings.

Lock down has revived my interest in vintage gliders - especially now modern micro r/c weighs less than the models original nose weight !
and looking for inspiration.

Guessing the current BBC's forecast of light rain, but more important 15/16mph winds may cause problems?

regards Paul




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Russ Lister
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« Reply #434 on: May 23, 2021, 05:01:22 PM »

Paul,
You sound dangerously close to me? ... I'm a member of the PMFC .... great club   Smiley
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Yak 52
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« Reply #435 on: May 23, 2021, 05:42:33 PM »

Guessing the current BBC's forecast of light rain, but more important 15/16mph winds may cause problems?

We've been assured John with be there 3:30pm come rain or shine. Whether anyone else will is another matter!   Cheesy Perhaps best check before travelling...
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Yak 52
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« Reply #436 on: May 28, 2021, 02:23:24 PM »

The first bungee comp was flown in sunshine but strong winds on Tuesday so I didn't push to finish my glider as I expected it would be too windy to trim. After flying E20 I took the battery and prop off a Ferry 500, bent a pin into a hook and flew it in the 36" class Grin It flew surprisingly well and won the comp with three flights around 15-17 seconds. To be fair there were only two other entries (a Gnome and a 20" KK Cub) both of whom dropped a couple of flights with unlucky launches.


I finished the Rumball Strip today and flew it briefly this evening. It came out at 77g before nose weight.

Early days with trimming but I'm extremely pleased with the launch height and glide/sink rate. It was a lifty day but early indications are gratifying. The auto rudder works well but the quick bodge damper D/T failed and it flew out of the field landing in the bushes 30 feet out over the lake. Got it back undamaged after some precarious branch balancing and bramble diving Smiley A version of my own design electronic D/T will be fitted at some point.


Jon
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Russ Lister
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« Reply #437 on: May 28, 2021, 02:46:14 PM »

A resourceful entry in the glider comp!  Smiley

Glad to hear that the 'proper' glider is coming along well.
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Yak 52
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« Reply #438 on: May 28, 2021, 05:13:14 PM »

Cheers Russ. Be good to see you over with the Rumball's Yard Smiley

Just weighed it with nose weight at a whopping 102g. That's punishment for not keeping the back end light!!
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Yak 52
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« Reply #439 on: May 30, 2021, 02:51:23 AM »

More trimming yesterday morning in light but vary variable winds from strong thermal infill which made launching a bit inconsistent. I got a few really high launches but later had some issues with early line release. In terms of stretch there is tons of energy available in the 1/8" rubber and less is more. However with less power I was getting a slight stall/nod early on the line, maybe I need to ease the hook back a bit.

Very pleased with the glide trim though, it seems to sniff out lift nicely and the sink rate is very low.

I had another fly away - off and over the river - when the D/T was slower than expected - fortunately I got a good transit line on the model with the OS map and found it quickly - after a long walk! Definitely considering RDT now.

I got one video but realised that filming was making me launch badly  Roll Eyes
https://photos.app.goo.gl/gw15Gr6YmrUXc37R8
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OZPAF
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« Reply #440 on: June 01, 2021, 02:45:36 AM »

I must get off my butt - you fellows are having too much fun.

Good luck with it Jon.

John

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kkphantom
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« Reply #441 on: June 01, 2021, 12:30:03 PM »

Oo... look at all them luverly buttercups.....

Gary
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