Hong Kong RC Sailplane Forum 香港滑翔機發燒友論壇

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PostPosted: 04 Feb 2010 11:23 pm 
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Just finished the fuselage today, will make the boom soon.

Image

Image

8) 8)


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PostPosted: 04 Feb 2010 11:24 pm 
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8)

The canopy :

Image

8) 8)


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PostPosted: 04 Feb 2010 11:25 pm 
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Hi folks,

Here is my vacumum bagged tail. Only 5.4 gram with live hinge.

Thanks for Ah MAK lending the vacumum pump to me.

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8) 8)


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PostPosted: 04 Feb 2010 11:25 pm 
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Dear all,

I finally make the boom today after the finish of the fuse 5 months ago.

Step 1:

Make some tools for rolling the video tape. A tapered wooden pole, and a stand

Image

Modify a servo (make it turns like a motor) and put a switch on it. Also put a servo disc on the wooden pole.

Image

Make a video tape dispenser for even pressure applies on the pole.

Image

Step 2:

Wrapping the pole with video tape.

Image

Step 3:

Cut the uni-carbon into size I need.

Image

Step 4:

Wet out the frabic.

Image

Step 5:

Put several layers of frabic together and roll them on the pole (No picture this time, as to my messy hands).

Step 6:

Put the pole on the motor set, and repeat step 2. This makes the video tape wrapping the carbon frabic and squeesing all the air and excessive epoxy (no picture again. Messy hands)

Step 7:

Soak the excessive epoxy away every 5 minutes.

Image

Step 8:

Wait for the epoxy sets.

Image

Step 9:

Removing the outter layer of video tape. The boom seems OK.

Image

Will update later.

:P :P


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PostPosted: 04 Feb 2010 11:26 pm 
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Joined: 03 Mar 2004 07:31 pm
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Hi folks,

The first boom I made was a bit heavy as I have used 6oz Uni-CF.

Having gotten some 3oz uni-CF, and some 1K CF, and finally made a light boom (this is the 3rd attemp):

Fitted to the fuse:
Image

I think it looks better if the 1k CF is at the outter side :

Image

15.5g (boom only) is not too bad, right ?
How do you guys think ?


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PostPosted: 04 Feb 2010 11:26 pm 
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Joined: 03 Mar 2004 07:31 pm
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Hi folks,

My vacaum bump is done and working fine:

Image

8) 8)


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PostPosted: 04 Feb 2010 11:29 pm 
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Making the wings:

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8)


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PostPosted: 04 Feb 2010 11:30 pm 
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The cutting bow:

Image

8) 8)


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PostPosted: 04 Feb 2010 11:31 pm 
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The 'Feather cut' ruler:

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:lol: :lol:


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PostPosted: 04 Feb 2010 11:32 pm 
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The product :

Image

:lol: :lol:


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PostPosted: 04 Feb 2010 11:33 pm 
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I have two pairs of wings now:

Image

:P :P


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PostPosted: 04 Feb 2010 11:38 pm 
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Live hinged parts:

Image

:P :P


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PostPosted: 05 Feb 2010 12:00 am 
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Joined: 26 Feb 2004 09:19 pm
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Location: 將軍到
Pong Pong! You so excellent! :shock:


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PostPosted: 05 Feb 2010 09:15 am 
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Joined: 26 Feb 2004 05:08 pm
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Location: Hong Kong
Hello Pong-pong. What is the material you used to make the templates?


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PostPosted: 05 Feb 2010 09:48 am 
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Joined: 26 Feb 2004 07:54 pm
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Location: Tai Po, HK
Ah Pong,

That's a very nice wing core :!: :D

Did you let the hotwire bow run by itself ?


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PostPosted: 05 Feb 2010 10:32 am 
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Hi CM,

The templates were made with aluminium (1mm thickness).

Ah Mak,

The bow just like my son, need guidance and coaching. :lol: :lol:

BR,


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PostPosted: 06 Feb 2010 03:21 pm 
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8) 8)

Image

2 oz glass at the leading edge,

6 oz of Uni-carbon as spar

3 oz peel ply as hinge

The skin is also 2 oz glass (already placed on the maylor)

8) 8)


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PostPosted: 12 Feb 2010 05:32 pm 
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Hi folks,

The wings are done.
(the fuse is still my old long-shot)

Image

:P :P [/img]


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PostPosted: 17 Feb 2010 11:31 am 
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Joined: 26 Feb 2004 05:08 pm
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Location: Hong Kong
Why not taper the spars. Wing tip carries less load then the center :twisted:


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PostPosted: 18 Feb 2010 12:56 am 
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Hi CM,

Your statement is right during normal flight time.

However, the tip have to bear a huge amount of load during launch. To be safe, I'd rather make it stronger.

P.S. I may be wrong.


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