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Old Aug 30, 2013, 07:17 AM
71% of the world is runway . .
Bart83's Avatar
Nederland, ZH, Oostvoorne
Joined Jun 2009
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Build Log
Dornier Wal , free download plan balsa build




Dornier Wal 2nd flight (5 min 22 sec)



Hello fellow waterflyers ,

Last weekend i made a design for a small balsa Dornier Wal. Its a fun scale seaplane. The setup i plan to use for this comes from my G44 widgeon.

2x Rimfire 400 motors
2x 30A esc's
3300mAh 3cell Lipo

The plane has a wingspan of 1400mm , lenght is 992mm. Costruction is in 5mm balsa for the boxframe , 4mm balsa for the tailframe , 2mm balsa for ribs and formers , 1mm balsa for sheeting and 3mm ply for some parts.

I made a simple plan showing the basic construction and the parts. Most builders will be able to build the model from this. Construction for the struts , radio gear mounting etc have to be figured out by the builder. These things take lots of time to design in cad so i chose to leave it for the builder.

I attached some screens of the design in various phases and the plan as PDF. This can be print on a 36x72inch paper at the local print shop.

on the link below the pictures the pdf can be downloaded.

Dornier Wal



Hope you all like this . . .


Bart
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Last edited by Bart83; Apr 06, 2014 at 01:49 PM.
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Old Aug 30, 2013, 07:33 AM
71% of the world is runway . .
Bart83's Avatar
Nederland, ZH, Oostvoorne
Joined Jun 2009
1,612 Posts
Got the plan printed , costs were 6 euro's. Test fitted some of the electronics , there is room enough for the setup i plan to use.

Cheers,

Bart
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Old Aug 30, 2013, 07:39 AM
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Madison, WI
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Subscribed!
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Old Aug 30, 2013, 09:31 AM
GLM
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Check Six!
Joined Oct 2003
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Bart this is fantastic!

Does the Netherlands somehow have more time than the rest of the world?
How do you get all this done in such short order?

I love this plane!

I'm going to try one on the laser after my Empire wing is done.

Great work

Cheers!

Gary
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Old Aug 30, 2013, 12:40 PM
Always Ready!
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Chicago, IL
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Looks great Bart! Subscribed.
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Old Aug 30, 2013, 03:10 PM
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United States, IL, Joliet
Joined Jun 2009
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You know me Bart i will watch any sea plane build but yours are great.
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Old Aug 30, 2013, 04:17 PM
Slip the surly bonds...
Sopwith Mike's Avatar
Christchurch,England
Joined Aug 2004
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Looks great Bart, Nick Chud will like this plan!

Mike
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Old Aug 30, 2013, 05:11 PM
Parkcityflier
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Park City, UT, USA
Joined Aug 2001
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Great idea, Bart. It should be a quick build and look good in the air. Unfortunately, I don't have any more room on my plate for another build so I'll have to be content to just read the posts on this one.

Jim
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Old Aug 30, 2013, 08:13 PM
skumgummi dave
Gresham, OR.
Joined Mar 2004
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Lurking...
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Old Aug 31, 2013, 03:53 AM
What could possibly go wrong?
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Market Harborough
Joined Apr 2006
3,615 Posts
That's a super plane and practical too. I built one a few years ago by copying the full-size 3-views. It flew well but would not ROW because, as soon as I tried to get the tail out of the water, the sponsons would go under. What was in my mind for the next attempt was to leave the sponsons off till I could put it in the water and find the waterline. Then to post-fix them in the appropriate place.

Has someone already solved that problem Bart? I know Laddie built a successful one, but ... no surprise there!

Cheers

Nick
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Old Aug 31, 2013, 05:15 AM
71% of the world is runway . .
Bart83's Avatar
Nederland, ZH, Oostvoorne
Joined Jun 2009
1,612 Posts
Quote:
Originally Posted by nickchud View Post
That's a super plane and practical too. I built one a few years ago by copying the full-size 3-views. It flew well but would not ROW because, as soon as I tried to get the tail out of the water, the sponsons would go under. What was in my mind for the next attempt was to leave the sponsons off till I could put it in the water and find the waterline. Then to post-fix them in the appropriate place.

Has someone already solved that problem Bart? I know Laddie built a successful one, but ... no surprise there!

Cheers

Nick
Thats seem like a good idea Nick. One thing on the stummels im sure of that is very important is the angle of the stummel's bottom in relation to the hull bottom , they have to be the same ( red lines ) . If the bottom of the stummels is airfoil shaped ( green line on drawing ) it will create suction and then the model will be hard to get out of the water.
Cant wait to put this to the test . . . of to the hobbyshop for some wood . . .

Cheers,

Bart
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Old Aug 31, 2013, 07:14 AM
Parkcityflier
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Park City, UT, USA
Joined Aug 2001
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I used the exact same shape as what was shown on my 3-view drawings and had no problems. Getting the correct angle of incidence for the sponsons is important, too.
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Old Aug 31, 2013, 07:49 AM
71% of the world is runway . .
Bart83's Avatar
Nederland, ZH, Oostvoorne
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Quote:
Originally Posted by parkcityskier View Post
I used the exact same shape as what was shown on my 3-view drawings and had no problems. Getting the correct angle of incidence for the sponsons is important, too.
Your right there my friend , your wal handles very well on the water. On your Wal the sponsoons are placed a bit higher than on Nicks wal i think.

Have you flown your wal of mirror flat water Jim , i would like to know how that went. Usually a flat rimple free water surface is the biggest challenge for any flying boat.

Cheers,

Bart
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Old Aug 31, 2013, 01:00 PM
71% of the world is runway . .
Bart83's Avatar
Nederland, ZH, Oostvoorne
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Todays progress :

Went to the local hobby-store to but some wood. When i arrived home i got started right away

First thing to do was cutting the 5x5 balsa beams from the 5mm sheet. I used the balsa stripper shown and made the cuts in 3 steps to prevent the blade tracking the wood grain and so messing up the beams.

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Then i cut the boxframe side from the plan , fixed it to the building board and covered it with some waxed paper ( on long term loan from the kitchen )

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Then i cut the balsa beams for the boxframe to size using a fine razor saw. After that the beams where fixed to the board with some building pins. When the frame was aligned with the plan i glued it with CA and placed some diagonal spars.

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I had to make 2 frames and sanded them to be the exact same size
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Cut al the cross beams to side and made preperations to join the sides.
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Af first i fixed the sides and cross beams for the centre section , this section is a box so when this is build straight it will be hard to mesh up the rest of the boxframe. ( at least i hope )
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After a break i thought it would more logical to fix the frame upside down to the board as the top of the boxframe is flat . . .ppff why didt i see this earlier ( nightshifts make my brain less effective i guess )
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Joining the sides goes without any trouble for the aft section
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To make the bend in the balsa at the front part of the hull i had to soften the balsa otherwise it would break. I used a small injection needle pump to wet the balsa ( and not the rest of the room ) i used soapy water for this.
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After a while the balsa was soft enought and i carfully could make the bend and fix it in place with some weights.
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Not bad for one day :
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More to come soon . . . .


Cheers,

Bart
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Old Aug 31, 2013, 01:38 PM
Parkcityflier
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Park City, UT, USA
Joined Aug 2001
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Bart, my Wal flys fine off of mirror flat water. In fact, I always try for those conditions on all my waterplanes. Looking at your new build. Sometimes it's nice to take a break from a high intensity project (the DO 24) and just do some building. Have fun.

Jim
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