Lemans

Hi everyone, I offer CAD design time for anyone who wants 2D ore 3D files for any OpenEZ part. Although I’m not up to building an OpenEZ right away I like to contribute to this project without interfering into the discussion what to change or what to include into the original concept. I’m not experienced enough to take part in these developments. So, this is what can do for the project. I can design any part - big or small- simple or complex - into 2D drawings (dxf) or 3D (iges) models. If I can be helpful don’t hesitate to contact me. dendaele@gmail.com or johan.daelemans@skynet.be Just a little example of what I’m capable of. http://www.homebuiltairplanes.com/forums/general-auto-conversion-discussion/5914-industrial-honda-gx620.html Regards Lemans

Thanks Kent, interresting link. Like I said, it's very premature as I like to finish the hybrid for my Shadow first. The first "real world" parts are ready to be build. I expect a useable system at the end of this year. If you are interested, you can follow the whole discussion and progress here: http://www.bmaa.org/forums/default.aspx?f=45&m=40462 After verifying a lot of info on hybrid systems it came clear that a good specific consumption is reached only at full throttle (max power) on a petrol engine. It’s possible (and done before) to reduce the fuel burned to 0,2 liter/hp/hour, this makes approximately. 20hp on the gallon/hour. How fast is a VariEze going on 20 hp? Or 40 hp… If it can take-off on 80hp I expect it to stay in the air with 30 hp. Returning on the VariEze, Yesterday I took contact with someone who owns one. I asked him to copy some parts of his plans concerning the engine bay/fuselage. Johan

I doubt it. As I like to use a future Cozy for cross country flights I want to fly as far as possible on a gallon of fuel. So, I choose a desired cruise speed and the existing charts on fuel consummation are indicating the necessary power needed for this speed. 1 gallon/hour is good for 10hp. The first engine will be around 50 hp. Impossible to take-off on that power so there will be a second one installed (+100hp) to work simultaneously with the first. IF there is enough room to install such a setup.

Hello, Is there someone who can provide me dimensions and or designs/plans concerning the engine bay of a Cozy MK IV. It very premature but I like to check if there’s enough room for a rather unusual power plant. ( no, not steam…) Regards Johan I tried to do some modeling on a PDF file but I think it’s not accurate enough

Oh, ok I don’t want to start building a long EZ right away. I’m occupied building a hybrid engine for my Shadow and this will take me to the end of the year. ( BTW: this is an open project too ) However, main goal is still flying the EZ in a couple of years. So, just in case, I like to find as mush CAD files as possible from the Long EZ as I only feel comfortable after putting the whole plain virtual together (3D). I know this is a hell of a job, I’m doing the engines and the Shadow at this moment. I think there are a lot of parts who are already on file and I it’s better to draw parts that are not on file than do the job twice. Regards Johan

I think I'm missing something….. Is this “open-EZ” or “long-EZ” dead?

Full power is never a problem when it comes to reliability. Tuning the full power on low piston speed is the key. So, the design for the economic engine is a bit contrary as what we are used to. But this is not a topic on hybrid engines, I just need CAD drawings to check out a few idée’s.

Hi, The meaning of hybrid is in fact noting more than 2 engines –electric or ‘whatever’- working together (or separated) as need demands. In this case it’s a pair of gasoline engines designed and used for their proper purpose. In my point of view, airplanes are born to use hybrids as they have two (by user) defined power levels. One is take off and the other is chosen cruise speed. An ordinary 4-stroke engine, doing his job on full throttle is not bad at all, burning 1/5 liter for each HP an hour. Problem starts when operating at “economical” cruise where the engine operates in bad conditions, burning up to 3/5 liter / HP/hour. Main reasons for this are pump losses and a no longer correct compression rate. ( for this reason they ignite the fuel faster). Theoretic solution is rather simple: use a 4-stroke at full throttle delivering enough power for your pre-chosen cruise. For my Ultra Light this is 15 HP at 110 km/h. (take off power = 50 HP) The only trouble is taking off… and here we need another engine to help the ‘cruise’ engine. In my case the cruise engine is a strongly modified 4-stroke 250cc Honda CRF delivering 15 HP @4700 rpm and the ‘take off help’ engine is an unmodified 2-stroke Honda CR engine, 56 HP @12000 rpm. Both engines can work separately, driving a single propeller. Before this all started I was already a huge fan of the long EZ, we even have here a team EZ’s flying demo’s on air shows (the REVA patrouille/France). It’s not that I absolutely want to build one, buying an EZ is an option too. Replacing the installed engine with an ‘hybrid’ is the goal, cutting fuel costs in two - or flying twice as far. Regards Johan

Hi, Not that I'm going to start building the ‘open’long EZ tomorrow, but one day… I hope... So, to avoid a possible long search in a few months, is it possible to download CAD files somewhere? (dwg format) I already downloaded the pdf’s a few weeks ago but I must admit that good 3D drawings are much easier to work with. At this moment I’m working on a hybrid project for my Shadow (it’s a pusher too) and if the results are as expected, a hybrid for the EZ is the next step. As I’m designing all engine parts in 3D, all 3D or 2D drawings of the EZ are most helpful. Thanks Lemans – France/Belgium