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Kromhoutmuseum Amsterdam, e-mail, 11.07.2017 00:42 In the Kromhout Museum in Amsterdam you can find now the Ramjet engine and a small copy of the Kolibrie Helicopter.
We still are interested concerning the history of the Kolibries in Israel now.
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Frans van Bergen, e-mail, 19.09.2015 09:36 The Kromhout Museum in Amsterdam is still looking for a complete Kolibrie or parts e.g. Ramjets to put on display in the museum to complete the collectiion of products manufactured by Kromhout up to their closing down in 1969.
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Will van den Brekel, e-mail, 08.09.2014 20:05 Een leuk gadget aan deze helicopter is de startmotor.
Dit is namelijk een tweetakt bromfietsmotor van het merk "PUCH".
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Willem Broekhuizen, e-mail, 21.08.2014 20:05 I ran the test stand for the ram jets prior to installation on the helicopter. The Kolibrie project could have been the start of helicopter development in the Netherlands.
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Ben Gieze, e-mail, 24.05.2014 02:06 H-3 PH-NHI is now (april 2014)on display in "Luchtvaart- en Oorlogsmuseum Texel" (LOMT),the Netherlands
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Arie Fussman, e-mail, 24.03.2011 17:00 Was used in Israel by Jerry Renove, for agriculture crop-dusting.
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loet kuipers, e-mail, 23.01.2010 11:45 Hi,
Besides the H-3 Kolibri(PH-HNI), the SOBEH H-2 (PH-NFT) is preserved and on show in the Aviodrome Museum at Lelystad Airport in the Netherlands.
An example of the ramjet engine, a Kromhout TJ-5 is on display in the "Vliegend Museum" on Seppe airport near Roosendaal Netherlands (link to the museum: www.luchtvaartmuseum.nl)
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Harrie, e-mail, 19.01.2010 13:23 Regarding the aerodynamics. That is not different from any other helicopter.
The rotation of the wings, create a flow of air around the wing profile, resulting in lift. Angles of attack of forward and backward moving wing is changed by a special way rotory wings are connected to the axis.
The ramjet needs forward speed in order to be fired. The forward motion of the ramjet creates basically a small compression of the air as well as air flow. That is why the ramjet can only be started after a minimum rotation speed has been attained.
The Hogeschool Haarlem usedto have a complete version of the craft at their facility in Haarlem (NL). That might be the same that is currently at the Aviodrome.
Side step information onf the School mentioned. The HTS, Polytechnical University of Haarlem (part of Hogeschool Haarlem) used to have an impressive collection of aircraft parts and engines. The current board of the school has no heart for technical stuff and basically wanted to get rid of all the collected treasures. They even sold off the Technical University for Aeronautical Engineering (altough officialy it is still part of the school). It was the oldest university in the Netherlands on aeronautical engineering (BSc.) With an impressive number of students attending (every year more than 120 new students) dating more than 70 years back. It used to be ranked among the top universities of the Netherlands for engineering (Bsc.). I don't know the current status. Probably it is also one of the oldest schools for aeronautical engineering in the world as well.
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jamil, e-mail, 13.01.2010 19:09 hello does any one how erodynamics work for this system
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Jan, e-mail, 13.01.2010 06:54 Don't forget Borgward's Kolibri's
Love in detail
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R Pijpers, 25.07.2009 23:19 One can see archival footage of what I think is a Kolibrie making deliveries to the newly completed Flevoland polder at the Nieuwlandpoldermuseum in Lelystad.
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F. Tuijn, e-mail, 08.01.2009 10:59 In 1955 I saw one fly at Rotterdam Airport and was most
impressed by the increadible noise it made. Ramjets are
fine for highflying fast aircraft, not fot helicopters
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Shai, 11.12.2008 00:04 Hi there,
Yes, there is one kolibrie in a Dutch museum - see http://www.aviodrome.nl/themapark/expositie/collectie-overzicht/M-W.asp.
Another example, in a bad condition, can be found in Israel - see http://www.flickr.com/photos/21837606@N00/285008452/in/set-72157600277958085/
For the rotor system, check this out - http://www.agplane.nl/downloads/nhikolibriesmall.pdf
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Doug Heidke, e-mail, 27.11.2008 08:55 It would be very useful to obtain more info on the rotor system of this wonderfully simple helicopter. There must be some design details somewhere, and a possible example of the Kolibri H3 in a museum somewhere. Has anyone come across these details?
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Sjoerd Osinga, e-mail, 02.08.2008 19:31 I remember seeing a Kolibrie operating as a cropduster in Drente (Gasselternijveen-the Netherlands, late 50's) and I was struck by the simplicity and was wondering what ever came from this unique design. It appears that the high fuel consumption killed further commercial development. I wonder with the new technologies and designs of ramjets if this redign is practical again (50 years after its orginal design!)
Also are there any of these helicoptors left in muceums?
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Benjamin Bof, e-mail, 05.03.2008 19:17 Wonderful system of pulse jets at blade tips.
Why is unknown for agricopter uses?
Regards. Ben
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