Dolphin (oz1333)

 

Dolphin (oz1333) by Albert E Hatfull from Keil Kraft - plan thumbnail

About this Plan

Dolphin. Free flight towline glider from KK. This is a zip file of 2 pdfs: plan and printwood.

Update 20/04/2020: Unpacked this zipfile into 2 separate pdf files, the plan and the printwood.

Update 23/04/2020: Added kit instructions, thanks to NicholasTucker.

Supplementary file notes

Instructions.
Printwood.

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Dolphin (oz1333) by Albert E Hatfull from Keil Kraft - model pic

Datafile:

Dolphin (oz1333) by Albert E Hatfull from Keil Kraft - pic 003.jpg
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Dolphin (oz1333) by Albert E Hatfull from Keil Kraft - pic 004.jpg
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Dolphin (oz1333) by Albert E Hatfull from Keil Kraft - pic 005.jpg
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Dolphin (oz1333) by Albert E Hatfull from Keil Kraft - pic 006.jpg
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Dolphin (oz1333) by Albert E Hatfull from Keil Kraft - pic 007.jpg
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Dolphin (oz1333) by Albert E Hatfull from Keil Kraft - pic 009.jpg
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Dolphin (oz1333) by Albert E Hatfull from Keil Kraft - pic 018.jpg
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User comments

More pics. Another nice small glider [see more pics 003, 004] and a good one again build from the plan dowload. Keil Kraft Dolphin glider.
Joost - 12/08/2014
Hi. Your website is amazing. I build a Keil Kraft Dolphin [more pics 005]. See the build log in this link from Chile: cach.cl/foroSMF Test flight www.youtube.com Thxs
DavidVera - 04/04/2016
Was home for a week so I got some flying done and took photos of my three latest projects built with Outerzone plans. This is Keil Kraft's Dolphin at finishing stage, static and flying. I covered the Dolphin in pink tissue, a tribute to breast cancer and aids awareness here in South Africa [more pics 006-013].
AndyCoutts - 16/08/2016
Between 1955 and about 1958, I built several Dolphins. My chief memory of them is that, unlike many small towline gliders of the period, they towed straight - no weaving, no veering off to one side or the other. Note to builders: for the wing mainspars, choose the toughest balsa you can find - or preferably, for the centre panel at least, use spruce!
JohnP - 04/02/2018
I built a Dolphin glider back when I was 14 years old in 1955. Third flight off a 200 in button thread tow-line, it caught a thermal, (Of course, no D/T!) and I never saw it again.
Brian Templeton - 18/05/2019
There is no space for the dihedral brace on the ribs where the wing tips join the main wing.
Alan - 20/04/2020
Yes. I think KK expected you to build up all 3 wing panels, then as the final step, notch out the 4 end ribs (by eye) to allow fitting the 2 braces. Maybe the instructions are more helpful.
SteveWMD - 20/04/2020
You are 'right on the money', Steve. It was usually done like that in those days, carefully cutting the slots with either a thin file or a hacksaw blade after gluing the tips and centre section together.
I would use two dihedral braces per panel though, not one as shown. One for the bottom spar and another for the top one.
Arn - 20/04/2020
Yes, I quote the instruction leaflet: "When dry (wing tips to centre section) enlarge the slots immediately behind the top spar at the dihedral joint positions and cement the dihedral braces in position alongside the top spar".
I will scan the leaflet and post it to Mary
Nicholas Tucker - 21/04/2020
Dear Mary, Steve, hope you are doing well in these difficult times. We are trying to get the best of the forced stay at home; relax, reading, and trying to prepare for a way of life after the emergency is over - if possible- less stressful than before. And small gardening and, oh, yes, building airplanes.
Me and Laura had a good time buiding - one stick at the time- the little Dolphin (oz1333).
This is an RC conversion and I obtained it by adding a little movable surface to the h-stab, and splitting the v-stab in two. I have also reduced the angle between wing and h-stab to get a less 'nose up' attitude than required for free-flight, but I'm note sure it is a good idea. We don't know when we'll be able to fly it, but as for now we're happy of its outcome as static display!
Hope you may like the pictures I'm attaching of the tiny glider amongst Laura's beloved plants [pics 015-018]. We're very lucky to have this little home garden to pass time in during the lockdown; the gazebo, btw, has been handmade in England.
All the best and thanks
Raffaello and Laura - 07/05/2020
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