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

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.

Then took a foam dinner plate I got for Rs2!
And cut the wing and tail parts from it

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...

And it flies!

So now I can build a few kits in balsa for the 'Next Contest'

Maybe a few more of you will join!

This build took 1 hour.
Including a 30 minute walk with the dog!

Nice going Mr.Iyer 

Quote from: sahilkit on October 08, 2020, 10:18:50 PM
Nice going Mr.Iyer 

Thanks.
Perhaps you may like to join the 'Next Contest', as a participant, or a sponsor...

i want to  but no time too much of work 

If things get better i can be the surprise entry 

Quote from: sahilkit on October 08, 2020, 10:52:05 PM
i want to  but no time too much of work 

If things get better i can be the surprise entry 

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

I will also be participating sir,but will be using a paper aeroplane style launcher...What is the required flight time?

Sir , is it 1mm or 2mm balsa?

Quote from: SI74 on October 13, 2020, 07:29:51 PM
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 

Regards

Quote from: Karthick Ashwath on October 12, 2020, 09:35:07 AM
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

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

Quote from: K K Iyer on October 13, 2020, 07:42:35 PM

Quote from: SI74 on October 13, 2020, 07:29:51 PM
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 

Regards

Sir , I have some balsa sheets with me ( 2mm ) So I wanted to know whether that would suffice . Thanks for clarifying.

Made 5 kits

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!

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

Quote from: SI74 on October 14, 2020, 08:54:12 PM
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

2.5gms if fine for a start.
Please post a video here of your test flights.
Regards

Should I sir ? Before the contest ?

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 ? From the rules , I think I have to launch it from the ground itself , isn't it sir?

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  
Regards


Post a pic of the model too.

Quote from: SI74 on October 14, 2020, 09:00:31 PM
Should I sir ? Before the contest ?

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