Restoring a ramjet helicopter

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Shai
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Restoring a ramjet helicopter

Post by Shai » Sat Jun 09, 2007 9:25 am

Hi everyone,
My name is Shai, and I’m from Israel.

A few months ago was published here, by the member Leo, a video of the Kolibrie – a Dutch helicopter from the 50’s. There is one such helicopter in Israel, and it’s about to be restored – not by me, though. It is the only one that survived, from the seven Kolibries which had arrived at Israel.
Unfortunately, it won’t be flying and it won’t stay in Israel too… :(
Here is a photo of the engine. You can see other pictures here:

http://www.flickr.com/search/?q=kolibri ... pter&w=all
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IMG_0569.jpg
forward view
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Mike Everman
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Post by Mike Everman » Sat Jun 09, 2007 1:20 pm

It amazes me how stone age that motor looks, and how simple ram jets are in general.
Where is it going to go after restoration?
Mike
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Shai
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I’m not sure

Post by Shai » Sat Jun 09, 2007 1:42 pm

Last time I spoke with the person who wishes to restore it, he had no specific buyer, although it would probably be an aviation museum. I’m gonna meet him again soon and ask him.
And yes, it looks quite primitive… it seems to me like a “double” ramjet, since it has elliptical rather then circular cross section, dual flame holders and burners and so on. Am I right?
And does anyone have, or can get, a picture of the inside of other rotor tip engines, like the ones of the Hiller Hornet?

Shai
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Oh… I forgot something

Post by Shai » Mon Jun 11, 2007 6:16 pm

The size of that thing… here are the dimensions of the engine (in centimeters- sorry Americans)

General dimensions: 49 by 32 by 20
Lengths (roughly): divergent (front) section 8, combustion chamber 24, convergent 17
Intake: 23 by 10.5
Nozzle: 27 by 9

Jim Berquist
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Post by Jim Berquist » Mon Jun 11, 2007 7:25 pm

With the flame holders so open like that, you wonder how it worked at all.

It's like two engines within the same .

Jim
WHAT TO FRAP, IT WORKED![url=callto://james.a.berquist]Image[/url]

Pieter van Boven
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Post by Pieter van Boven » Wed Sep 19, 2007 6:31 pm

hello Shai,

The colibri pictures are great! Do you know who will restore it? Please, can you sent me information about the restorator/owner. Are there drawings?
I found one of these TJ5 engines in a dutch museum. I do have picture but can't get them uploede here.

thanks,
Pieter.

Shai
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Post by Shai » Sat Sep 22, 2007 3:15 pm

Hello Pieter,

I've sent you an email. Did you recieve it?

Pieter van Boven
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Post by Pieter van Boven » Wed Sep 26, 2007 7:52 am

Hello Shai,

Yes I replied but the maildelivery system kept sending it back. I think because of the size of the pictures. I think you have received it now.
Here is a picture of the engine wich can be found at the museum near the airfield Seppe in the Netherlands.

Pieter.
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ramjet2.GIF
colibri ramjet engine
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leo
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kolibrie

Post by leo » Wed Sep 26, 2007 3:54 pm

look at this post pieter very interesting.

http://www.pulse-jets.com/phpbb2/viewto ... t=kolibrie

Shai
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Latest update

Post by Shai » Sat Oct 20, 2007 12:35 pm

There is still no buyer for the helicopter. Nevertheless, some people in Europe are interested in it, and everything is still open.

There is an interesting story about the engines. I’ve heard it from a few persons, and everyone had a different version… the most logical is that:
The ignition system wasn’t so reliable. Hence, the late Mr. Renov, who was the main Kolibrie’s pilot in Israel, had developed another starting method – he used to insert kerosene-dipped rags to the engines’ nozzle, light them up with a match, turn the rotor manually, and activate the fuel pump. It did work! Most of the time :)

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