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« on: October 09, 2014, 06:54:25 PM »
sanjayrai55
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Browsing through Outerzone.co.uk I came across the Honker Bipe (http://outerzone.co.uk/plan_details.asp?ID=5801)

Having never built a Jedelsky wing before, I was intrigued, and decided to give it a bash  Grin Grin

I ordered some balsa from RCB, which was delivered with their usual rapidity - 3 days from order to receipt! RCB rocks  Smiley

http://s25.postimg.org/agi5nwx8f/20141001_115918_Copy.jpg
Scratch Built Honker Bipe (Jedelsky style wing)


http://s25.postimg.org/hig3a40u7/20141001_115924_Copy.jpg
Scratch Built Honker Bipe (Jedelsky style wing)
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« Reply #1 on: October 09, 2014, 07:06:40 PM »
sanjayrai55
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The build is relatively straightforward

I did do some modifications as I will be using a Brushless Motor, not an engine

http://s25.postimg.org/80gca2f5r/20141002_112244_Copy.jpg
Scratch Built Honker Bipe (Jedelsky style wing)


The MAS plane is a big help for removing large amounts of balsa. The SKIL orbital sander helps too

http://s25.postimg.org/ch8p8qtdr/20141002_113358_Copy.jpg
Scratch Built Honker Bipe (Jedelsky style wing)


Used here to make triangular stock

http://s25.postimg.org/7dhfkji9r/20141002_120003_Copy.jpg
Scratch Built Honker Bipe (Jedelsky style wing)
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« Reply #2 on: October 09, 2014, 07:18:50 PM »
sanjayrai55
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Anticipated weight about 1.1-1.2 Kg all up (with 2200 3S Lipo)

Thought about a 2836-1200, but wanted a little more torque, so selected the DM 2610 - 1200 KV from Kinetic Hobbies

http://s25.postimg.org/4329c573z/20141003_210451.jpg
Scratch Built Honker Bipe (Jedelsky style wing)


This motor comes beautifully packed, with most accessories. Decided to mount it from the inside.

The interesting, and in my opinion very good thing, difference I found in this motor is it has a 3 point shaft retaining/mounting arrangement. Instead of a circlip common with most Chinese motors, this has 2 retaining rings. Having had a couple of nasty incidents with circlip failures, I'm pretty happy with this. Also, that fat 5 mm shaft inspires confidence  Wink Grin. 89 grams is an acceptable weight with connectors.

I used a 30 A ESC from Kinetic Hobbies too

http://s25.postimg.org/h8hri90zj/20141003_210504.jpg
Scratch Built Honker Bipe (Jedelsky style wing)
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« Reply #3 on: October 09, 2014, 07:24:19 PM »
sanjayrai55
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http://s25.postimg.org/yzk7581mn/20141003_210436_Copy.jpg
Scratch Built Honker Bipe (Jedelsky style wing)


Cut a hatch out from the fuse top. Put a ply tongue and a hatch lock

http://s25.postimg.org/xyt57kzen/20141003_210516.jpg
Scratch Built Honker Bipe (Jedelsky style wing)
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« Reply #4 on: October 09, 2014, 07:31:34 PM »
sanjayrai55
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Bottom wing. Have to cut out the ailerons still.

http://s25.postimg.org/ouzbkvn7j/20141004_184323.jpg
Scratch Built Honker Bipe (Jedelsky style wing)


Oops - a servo connector needed changing  Roll Eyes

http://s25.postimg.org/y0331018f/20141005_123114.jpg
Scratch Built Honker Bipe (Jedelsky style wing)


Cutting out cabanes. Used 3 mm lite-ply - had doubts  Huh? Huh? So I then doubled with 3 mm balsa too Cheesy

http://s25.postimg.org/pztdq99of/20141005_202951.jpg
Scratch Built Honker Bipe (Jedelsky style wing)
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« Reply #5 on: October 09, 2014, 07:35:48 PM »
sanjayrai55
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I used Monokote (generic term for heat-shrinking self-adhesive film) hinges throughout. Been a very very long time since I did that, and the first time I'll be using Monokote hinges on Ailerons

http://s25.postimg.org/3pa4411rz/20141007_191651.jpg
Scratch Built Honker Bipe (Jedelsky style wing)


http://s25.postimg.org/vqjk3zhof/20141007_191658.jpg
Scratch Built Honker Bipe (Jedelsky style wing)


http://s25.postimg.org/73sak5x6n/20141007_191900.jpg
Scratch Built Honker Bipe (Jedelsky style wing)


http://s25.postimg.org/kahqjosvz/20141007_192222.jpg
Scratch Built Honker Bipe (Jedelsky style wing)


http://s25.postimg.org/ieqcusenz/20141007_202224.jpg
Scratch Built Honker Bipe (Jedelsky style wing)


http://s25.postimg.org/e0mgwothb/20141007_202229.jpg
Scratch Built Honker Bipe (Jedelsky style wing)
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« Reply #6 on: October 09, 2014, 07:48:18 PM »
sundaram
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How I would like one of my engines on this model  Clap Clap Clap.

Any chance if it will come up for gift once done I am first on the line.  Drool   Grin
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« Reply #7 on: October 09, 2014, 07:52:38 PM »
sanjayrai55
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Sandy saheb,

If I don't bust it on the maiden;

and if I decide to give it away;

and if it is in flyable condition at that time;

you would be welcome  Cheesy Cheesy Thumbs Up
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« Reply #8 on: October 09, 2014, 07:58:59 PM »
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nice build!! good to know tat ur working on sanding too!! the advantage is that the time taken to build a Jedelsky wing is less but on the other hand considerably more amount of wood is used than normal airfoils!! Jedelsky wings are mostly for slow flying, lets see how yours goes!! had used them on my Jetex 250 build , turned up nice but didnt have too many flights!!
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« Reply #9 on: October 09, 2014, 07:59:45 PM »
sanjayrai55
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http://s25.postimg.org/gztdjt2yn/20141008_130706.jpg
Scratch Built Honker Bipe (Jedelsky style wing)


Black monokote is horribly difficult to peel the backing film from. Stupid me - I had Black coloured tape  Bang Head

http://s25.postimg.org/hvugd020v/20141008_130713.jpg
Scratch Built Honker Bipe (Jedelsky style wing)


Tail feathers also use monokote hingeing

http://s25.postimg.org/9mikyl8an/20141008_130737.jpg
Scratch Built Honker Bipe (Jedelsky style wing)


Bottom wing ready

http://s25.postimg.org/p1m7fgb3z/20141008_130747.jpg
Scratch Built Honker Bipe (Jedelsky style wing)


http://s25.postimg.org/3uigrfygv/20141008_130808.jpg
Scratch Built Honker Bipe (Jedelsky style wing)


http://s25.postimg.org/43g1hdb9b/20141008_132327.jpg
Scratch Built Honker Bipe (Jedelsky style wing)
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« Reply #10 on: October 09, 2014, 08:02:55 PM »
sanjayrai55
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Subhash, as I mentioned this is the first model I am building with a Jedelsky style wing, so I have no idea.

If, as you say, it is slow, that would mean a lot of lift, which is great. But the designer has called it a Sport Model (this was in commercial production as a kit too)
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« Reply #11 on: October 09, 2014, 08:10:41 PM »
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@sanjay sir - the Jedelsky airfoil is mostly used on gliders!! when someone talks about Jedelsky wing , the thought that comes to my mind are low speed , considerable amount of more lift and low Reynolds number!! actually these don't suit Jedelsky type of wings but Jedelsky wings suit these conditions!! so that means u could use it on a sports model too!!
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« Reply #12 on: October 09, 2014, 08:32:57 PM »
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Sir,
You are using a design from a master. (Bird of Time?)
Being built by a master builder.
Then why the doubts?

When was the last time that you built a model that did not fly?
Can't think of even one in the last 2 years!
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« Reply #13 on: October 09, 2014, 08:38:07 PM »
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dil mange more  Drool Drool Drool Drool
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« Reply #14 on: October 09, 2014, 10:18:24 PM »
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Hi sanjay,

what grade balsa did you buy from RCB? i recently got B-cut.

Sahil
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« Reply #15 on: October 09, 2014, 10:25:19 PM »
K K Iyer
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Grade and cut.
Two different parameters.
No?
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« Reply #16 on: October 09, 2014, 10:34:20 PM »
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Quote
Grade and cut.
Two different parameters.
No?

i'm also interested in knowing (sticker on my balsa says Premium Balsa Wood - Model Grain B-cut)

Sahil

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« Reply #17 on: October 10, 2014, 05:54:45 AM »
sanjayrai55
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Thank you for that confidence booster Iyer sir  Giggle Giggle
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« Reply #18 on: October 10, 2014, 05:55:32 AM »
sanjayrai55
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Bunty, more coming Cheesy
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« Reply #19 on: October 10, 2014, 05:57:00 AM »
sanjayrai55
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Sahil, A grade balsa is straight grain cut. The grain runs straight with the sheeting or piece. Its the nicest grade of balsa. The difference in grades is determined by the grain in relationship to the cut piece, some may have the grain at a 45 degree angle to the sheet or more or less, this is usually B or C grade. 4-6lb is the weight of a cubic 1 foot sq. 4-6 pound stock is the lightest grade and the hardest to get which lends the higher cost. 8-10lb stock is less expensive

That said, B Grade works OK too, except in thin sheets
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« Reply #20 on: October 10, 2014, 10:41:50 AM »
sanjayrai55
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Landing gear. I used a larger diameter tail wheel for 2 reasons - a) I did not want too steep an AoA so I could get time to build up speed, without the model jumping into the air; and b) Rough ground  Giggle Grin

http://s25.postimg.org/eu8q05v7j/20141010_085416.jpg
Scratch Built Honker Bipe (Jedelsky style wing)


Nylon Bolts to save weight. If they break, it probably would save my u/c mount, a block of 12 mm balsa  Wink

http://s25.postimg.org/8j83xhjcv/20141010_085403.jpg
Scratch Built Honker Bipe (Jedelsky style wing)
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« Reply #21 on: October 10, 2014, 10:46:01 AM »
sanjayrai55
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Since the wings are fastened with rubber bands, there are strong chances they will not be in the same location after diddembly and re-assembly. So used locator pins

http://s25.postimg.org/s4wktolrz/20141010_100433.jpg
Scratch Built Honker Bipe (Jedelsky style wing)


Fuse complete

http://s25.postimg.org/asw888san/20141010_100517.jpg
Scratch Built Honker Bipe (Jedelsky style wing)
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« Reply #22 on: October 10, 2014, 10:50:46 AM »
sanjayrai55
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Hope she flies  Huh? Huh? Angry

http://s25.postimg.org/jvfni5lq7/20141009_121938.jpg
Scratch Built Honker Bipe (Jedelsky style wing)


http://s25.postimg.org/48ouo5ovz/20141010_085317.jpg
Scratch Built Honker Bipe (Jedelsky style wing)


http://s25.postimg.org/z5kkmgnjz/20141010_085330.jpg
Scratch Built Honker Bipe (Jedelsky style wing)


http://s25.postimg.org/jy4l23vpb/20141010_085450.jpg
Scratch Built Honker Bipe (Jedelsky style wing)
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« Reply #23 on: October 10, 2014, 10:57:40 AM »
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Re:

Beautiful...  Thats a wow...  Hats off
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« Reply #24 on: October 10, 2014, 11:08:40 AM »
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DIYer



Bow

PS: Sanjay sir creating doubt to ward off buri nazar
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