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« on: October 08, 2020, 08:54:06 PM »
K K Iyer
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Hi everyone,

Some of you may remember the ‘1st Chuck’ from July 2018
http://www.rcindia.org/kites-trains-free-flight-and-all-others/1st-chuck/

It’s time for the 2nd Chuck.
This time it’s a Lunchbox, an 8” span hand launch glider, designed by John Oldenkamp, a well known American designer, in 1975.

Plans are available here:
https://outerzone.co.uk/download_file.asp?planID=11309&FileType=Plan&Filename=Lunchbox_oz11309.pdf
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« Reply #1 on: October 08, 2020, 09:04:26 PM »
K K Iyer
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I didn’t print the plan. Just saved it as a pic on my iPad.
Then adjusted the size for 8” span and saved a screenshot.
Then copied it and made a paper template.


8AAB8365-03F9-4122-9AB5-D3B7D02859DE.jpg
Re: 2nd Chuck - Lunchbox
* 8AAB8365-03F9-4122-9AB5-D3B7D02859DE.jpg (10.3 KB, 320x180 - viewed 162 times.)
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« Reply #2 on: October 08, 2020, 09:06:40 PM »
K K Iyer
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Then took a foam dinner plate I got for Rs2!
And cut the wing and tail parts from it

86C7E4A8-0C53-4A9F-95B2-DF7391233A18.jpg
Re: 2nd Chuck - Lunchbox
* 86C7E4A8-0C53-4A9F-95B2-DF7391233A18.jpg (7.32 KB, 320x180 - viewed 134 times.)
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« Reply #3 on: October 08, 2020, 09:11:06 PM »
K K Iyer
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Then made a fuselage from a piece of 3mm x 5mm x 10” piece ofscrap balsa.
And added a bit of plasticine for nose weight...

31DBCD7D-2421-413D-B72B-63FA2DFA7057.jpg
Re: 2nd Chuck - Lunchbox
* 31DBCD7D-2421-413D-B72B-63FA2DFA7057.jpg (9.39 KB, 320x180 - viewed 132 times.)
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« Reply #4 on: October 08, 2020, 09:14:22 PM »
K K Iyer
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And it flies!



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« Reply #5 on: October 08, 2020, 09:16:42 PM »
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So now I can build a few kits in balsa for the ‘Next Contest’

Maybe a few more of you will join!
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« Reply #6 on: October 08, 2020, 09:27:34 PM »
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This build took 1 hour.
Including a 30 minute walk with the dog!
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« Reply #7 on: October 08, 2020, 10:18:50 PM »
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Nice going Mr.Iyer  Grin
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« Reply #8 on: October 08, 2020, 10:23:37 PM »
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Nice going Mr.Iyer  Grin


Thanks.
Perhaps you may like to join the ‘Next Contest’, as a participant, or a sponsor...
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« Reply #9 on: October 08, 2020, 10:52:05 PM »
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i want to  Smiley but no time too much of work  Cry

If things get better i can be the surprise entry  Grin

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« Reply #10 on: October 08, 2020, 11:06:16 PM »
K K Iyer
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i want to  Smiley but no time too much of work  Cry

If things get better i can be the surprise entry  Grin


I’m surprised at how busy people are!
This kit needs 5 minutes to assemble. A few more if you wish to sand the wings.
Of course you’ll need an hour in the park on Sunday to fly it!
Sponsorship however needs no time at all!
Regards
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« Reply #11 on: October 12, 2020, 09:35:07 AM »
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I will also be participating sir,but will be using a paper aeroplane style launcher...What is the required flight time?
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« Reply #12 on: October 13, 2020, 07:29:51 PM »
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Sir , is it 1mm or 2mm balsa?
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« Reply #13 on: October 13, 2020, 07:42:35 PM »
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Sir , is it 1mm or 2mm balsa?

Queries about model on this thread please. Had to move this query.
On the ‘Next Contest’ thread, only contest queries please.

Pl see the plan.
It says 3/32 for wing, 1/8 hard for fuselage, 1/32 for empennage.
I’ve used 2.2mm for wing, 2x2.2mm for fuselage, 1.5mm sanded to 0.75mm for empennage

I’m not clear about the reason for this query  Huh?

Regards

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« Reply #14 on: October 13, 2020, 07:45:59 PM »
K K Iyer
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I will also be participating sir,but will be using a paper aeroplane style launcher...What is the required flight time?

Some problem with the video you posted.

Contest Guidelines since posted in ‘Next Contest’ thread

Regards
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« Reply #15 on: October 13, 2020, 07:58:12 PM »
K K Iyer
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In case you are not able to access the plan via the link in the first post, do this:

Go to outerzone.co.uk
Select search
Enter ‘Lunchbox’

You’ll get the plan.

Thanks to R C GUY for pointing out the error
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« Reply #16 on: October 13, 2020, 11:24:24 PM »
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Sir , is it 1mm or 2mm balsa?

Queries about model on this thread please. Had to move this query.
On the ‘Next Contest’ thread, only contest queries please.

Pl see the plan.
It says 3/32 for wing, 1/8 hard for fuselage, 1/32 for empennage.
I’ve used 2.2mm for wing, 2x2.2mm for fuselage, 1.5mm sanded to 0.75mm for empennage

I’m not clear about the reason for this query  Huh?

Regards



Sir , I have some balsa sheets with me ( 2mm ) So I wanted to know whether that would suffice . Thanks for clarifying.
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« Reply #17 on: October 14, 2020, 08:24:01 PM »
K K Iyer
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Made 5 kits

F117ADCA-BD34-4420-8A2F-22C5CB83203F.jpg
Re: 2nd Chuck - Lunchbox
* F117ADCA-BD34-4420-8A2F-22C5CB83203F.jpg (59.01 KB, 637x800 - viewed 64 times.)
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« Reply #18 on: October 14, 2020, 08:34:04 PM »
K K Iyer
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The 5 kits together weigh 30gms.
Or 6 gms each without nose weight.
Or probably 8-9gms with nose weight for balance.

If someone can get the AUW down to 5gms, it’ll be a wortwhile achievement.
And the difference in performance will show.

For comparison, the foamy version weighs nothing according to my scale!


3D3F48CE-AD84-4F81-88E1-3525D0F44FF9.jpg
Re: 2nd Chuck - Lunchbox
* 3D3F48CE-AD84-4F81-88E1-3525D0F44FF9.jpg (13.99 KB, 314x320 - viewed 35 times.)
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« Reply #19 on: October 14, 2020, 08:54:12 PM »
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The foamy version I built weighs 2.5 gms  ( with nose weight - glue ) . I thought I’ll have some test flights and training on trimming /launch etc before the contest Smiley

68E18EE4-BB9F-4529-BC43-FD2BFDA71893.jpg
Re: 2nd Chuck - Lunchbox
* 68E18EE4-BB9F-4529-BC43-FD2BFDA71893.jpg (46.89 KB, 640x480 - viewed 20 times.)
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« Reply #20 on: October 14, 2020, 08:59:16 PM »
K K Iyer
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The foamy version I built weighs 2.5 gms  ( with nose weight - glue ) . I thought I’ll have some test flights and training on trimming /launch etc before the contest Smiley

2.5gms if fine for a start.
Please post a video here of your test flights.
Regards
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« Reply #21 on: October 14, 2020, 09:00:31 PM »
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Should I sir ? Smiley Before the contest ? Wink
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« Reply #22 on: October 14, 2020, 09:25:00 PM »
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Ok sir , here’s a very short video . It glides smoothly , inside the room . Since it’s raining outside in most of the evenings ( predicted to continue for 4 more days) , I need to find a less windy day for more testing . Am I allowed to throw it from the balcony ? Smiley From the rules , I think I have to launch it from the ground itself , isn’t it sir?

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« Reply #23 on: October 14, 2020, 10:12:32 PM »
K K Iyer
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Excellent!
Just reduce nose weight a bit.
That will induce a slight stall.
Correct it by giving very slight left rudder.

No elevated launch. Otherwise the guy at the tallest building wil win  Grin
Regards


Post a pic of the model too.
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« Reply #24 on: October 14, 2020, 10:18:53 PM »
K K Iyer
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Should I sir ? Smiley Before the contest ? Wink

Yes.
This is the build thread.
All pics and videos of builds, test flights etc are most welcome.
Might even inspire others.

Later you can post your duration flight videos as entries in the Next Contest thread.

Regards
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