Fluteboy Revisited - is this the cheapest sloper? - RC Groups
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Jun 13, 2017, 01:02 PM
Flying one day at a time....
pardshaw's Avatar
Discussion

Fluteboy Revisited - is this the cheapest sloper?


I found an interesting chevron wing design on the net.


It is called the Fluteboy and is made from 3mm Corex (AKA Coroplast or Coroflute).


So I made one yesterday and flew it for the first time today. Never made a Corex glider before.


The airframe cost a total of 5.


Here's my video of some of today's horsing around with it......

Corex Fluteboy slope soaring. (3 min 10 sec)
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Jun 13, 2017, 01:14 PM
Flying one day at a time....
pardshaw's Avatar
I have never built a Corex sloper before.


But I have to say I think the material has potential and the Fluteboy is a very clever, simple design.


The 3mm Corex has a surface area/weight ratio of 1.95 OPSF.


The Fluteboy is a fold-over design, so it has an upper Corex layer and a lower Corex layer. So the 2 layers taken together weigh 3.9 OPSF.


The area of the Fluteboy is 3.8 Square Feet (SF). So the Corex part weighs 14.8 ounces.


That is no weight at all, since my Fluteboy (in the video above) has a flying weight of 40.6 ounces and a wing loading of 10.6 OPSF.


Did I mention it cost 5...?
Jun 13, 2017, 01:26 PM
Flying one day at a time....
pardshaw's Avatar
I'll post a few 'photos of the build shortly, and some share some thoughts on developing the design a bit further.

I think this one has a lot of potential......
Jun 13, 2017, 01:41 PM
Crikey never leave beer behind
steve wenban's Avatar
Yep Flute boys and the daZi have both been around for quite a few years now , the boys over in South Africa has developed the corro building to the next level with a lot of PSS style models as well these days . The flute boy has 1 thing over the daZi and that it does not have the spiral of death tip stall that the daZi has and shares with what it was cloned from the Zagi.
Jun 13, 2017, 02:08 PM
Flying one day at a time....
pardshaw's Avatar
Hi Steve.


I saw some of the discussion about the daZi and the Fluteboy - including your comments.


I downloaded plans for both, but as you say, the Fluteboy does seem to have that advantage, so I built it instead of the daZi.


We tend to have strong winds here (UK Lake District) so I opted for a medium weight with a bit of lead in it.


It like winds above 12 mph, but did pretty well when the wind dropped a shade to 8 or 9 mph, when it would scratch around quite happily with no sign at all of stalling. The nearest it gets to stall is an endearing touch of wing rocking. It has no bad habits as far as I can tell.


Dave
Jun 13, 2017, 02:14 PM
Flying one day at a time....
pardshaw's Avatar
There is some good info on the Fluteboy design, including a time-lapse construction video by rowdyrodcumming (with some flying in the second half).


His video is here (he also has another one which is worth checking out):-


Fluteboy from construction to flight... (2 min 17 sec)
Jun 13, 2017, 02:22 PM
Crikey never leave beer behind
steve wenban's Avatar
I have scale it up to 2 mtrs as well and it flew just the same , Stanley Chan of the Honk Kong slopers also did a design called the beetle which was cloned from a Bluto , which also flew well
You can if your careful 3 get Fluteboys out of an 8x4 sheet of corro which at the time years back when I was building in corro for $12 AU a sheet for 3.0mm you can even get it at 2.5 mm thickness if you're lucky ,which makes it that much lighter again . Anyway have fun ,enjoy and they hold there own in combat as well.
Jun 13, 2017, 02:42 PM
Flying one day at a time....
pardshaw's Avatar
Like Steve says, there is a lot of Corex building skill in South Africa.


I have no Corex experience other than this one build. But despite that, it went together well.


The original design has the top skin folded over and joined down the centre chord line, encapsulating the battery which therefore has to be charged in-situ.


I didn't want to do that, preferring a removable battery pack and removable lead. So I made a simple centre-pod within the fold-over structure.
Jun 13, 2017, 02:48 PM
Flying one day at a time....
pardshaw's Avatar
Quote:
Originally Posted by steve wenban
I have scale it up to 2 mtrs as well and it flew just the same , Stanley Chan of the Honk Kong slopers also did a design called the beetle which was cloned from a Bluto , which also flew well
You can if your careful 3 get Fluteboys out of an 8x4 sheet of corro which at the time years back when I was building in corro for $12 AU a sheet for 3.0mm you can even get it at 2.5 mm thickness if you're lucky ,which makes it that much lighter again . Anyway have fun ,enjoy and they hold there own in combat as well.


Thanks Steve. I got the idea of putting the balsa ribs in fro reading Stanley's Beetle blog.
Jun 13, 2017, 02:58 PM
Flying one day at a time....
pardshaw's Avatar
How durable is the Fluteboy???



Well, I smacked it into the ground plenty of times.



Interestingly the wing tips remained undamaged. The nose got squished (pushed in about an inch) making it snub-nosed. But no creases anywhere in the wing itself. No notable effect on the flying (the video is later in the afternoon with the snub-nose damage).
Jul 21, 2017, 03:37 AM
Reap the wild wind
headlessagain's Avatar
Interesting and cheap design. Do you have a link to the plans Dave as this might be ideal for a newbie to learn to fly slope?
My local Wickes sell 2400x1200mm 2mm sheets for 3.95 http://www.wickes.co.uk/Proplex-Surf...400mm/p/118670 This thinner material would make for a lighter wing but maybe not as tough. It looks like Jewsons also sell something suitable and, from the pictures, opaque as well as black http://www.jewson.co.uk/tools-fixing...rds-24m-x-12m/ Would be a better choice for adding colour to
Andy
Jul 21, 2017, 10:44 AM
Piscine Promulgator
surfimp's Avatar
I had a lot of fun with Mugis back in the day, and made my own take on a micro size conventional glider.

http://www.mugi.co.uk/

http://www.stevelange.net/spad/
Jul 21, 2017, 11:14 AM
Reap the wild wind
headlessagain's Avatar
I made a stock 800mm Mugi Evo and a 1m version for my brother. I felt the larger one was a better slope model.
Two Mugi Evo's coroplast/correx wings at Maes Knoll (5 min 36 sec)

I'd made powered versions of both years ago and came to the same conclusion
Andy
Jul 22, 2017, 09:11 AM
Objects in mirror are losing
1000MPH's Avatar
Check out the Flik.
This page was hard to find. Had to go to the way back machine.
The Flik was a faster building version of the mugi and mine was better flying.

http://web.archive.org/web/200906082...lik/index.html
Latest blog entry: Kinetic 2 Meter - K2mDP
Sep 09, 2017, 09:07 PM
Registered User

Battery Box Details


Hi Dave,

What battery box do you use, and what AA batteries do you recommend for it? The competition to your setup is a 4 AA Eneloop battery pack for $20-$22 from Canuck Engineering with 2000 mAh AA Eneloop, or Sanyo AA 2700mAH.
http://www.canuckengineering.com/new...-packs/aa-size
The folks at CE are on vacation at the moment, further fueling my interest in alternatives.

Edit -
I found battery boxes on line at Radio Shack in the US that are reasonably priced
AA with switch $1.50 on sale
https://www.radioshack.com/products/...battery-holder
AAA with switch $1.00 on sale
https://www.radioshack.com/products/...battery-holder

I also found on eBay US
Panasonic Eneloop AA 1900 mah batteries
4 for $11.50, free shipping
http://www.ebay.com/itm/4x-Panasonic...EAAOSwbwlXC5rg
8 for $19.70, free shipping
http://www.ebay.com/itm/8x-Panasonic...sAAOSwGYVXC5rr

Panasonic Eneloop AAA 800 mah batteries
4 for $10, free shipping
http://www.ebay.com/itm/Panasonic-En...8AAOSwaB5Xrewe

8 for $17, free shipping
http://www.ebay.com/itm/8x-Panasonic...IAAOSw~y9ZC1~n

4 2000 mah Eneloop AAs with charger $18
http://www.ebay.com/itm/Panasonic-En...AAAOSwILFZqTKp

4 - 800 mah Eneloop AAA with charger $27
https://smile.amazon.com/Panasonic-K...s+with+charger


Thanks,
rcflydad
Renton WA
Last edited by rcflydad; Sep 09, 2017 at 11:37 PM. Reason: Added battery box, battery and battery charger options


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