Ulm and light aircraft of the future

[Michel Kieffer]

Oiseautempete, rectification of my previous post following your information…

At a rate of 0,22 kg / hp.h, 10 l / h makes us 45 hp, or around 50% of P max.

Performance: 220 km / h at 50% (around 45 hp) at sea level (?). A quick calculation gives us a plane plate equivalent coefficient (Cfe) of the order of 0,005 which indicates correct aerodynamics (equivalent to that of an MCR and better than the current Cfe for our light aircraft: between 0,007 and 0,008).

For comparison, our machine http://www.hkw-aero.fr/projet.html aims for slightly lower performance for 2,5 x cheaper (40000 euros including tax) and with 2,5 x less installed power (40 hp). As for finesse, we get 16,5. But let's be careful , it is currently only performance calculated and partly obtained in the wind tunnel.

Thank you for your data and for your many information.

Michel

[Rosinger]

The next show will be held from 18 to 20 June 2010 at the Air and Space Museum at Le Bourget.

We feel a craze in this "green" year for the development of clean energies in the aviation sector.

Numerous exhibitors, static and aerial events, conferences, ... All information on http://www.aviation-verte.org/
There are still a few places available if you want to communicate around the Green Aviation.

see the pdf

(edited by ex-océano on 19/03/10 at 20:28 p.m .: correction of pdf link)

[Christophe]

I don't know if it has already been presented, but here is an electric ULM: https://www.econologie.com/forums/lsa-mc30e- ... 10568.html

[Michel Kieffer]

New document: quality criteria for all means of transport

This paper identifies what connects automobile, train and aircraft on the energy plan.

Here's what normally better understand the origin of the energy consumption of our means of transport whatsoever.

Good reading,
Michel

http://www.hkw-aero.fr/energies.html

[Michel Kieffer]

The infernal spiral...

This new document concerns the spiral coefficient (Cs) or mass amplification coefficient: see "Spiral coefficient (airplanes)" http://www.hkw-aero.fr/generalites.html .

The end result is extravagantly simple… but mobilized us for an equally extravagant duration: the simplest solution is always the most difficult to find !

Good reading,
Michel

[Andre]

Hello
Interesting topic for aircraft builders and enthusiasts.
It would be necessary to have the opinion of the pilots user of plane, it is also necessary to take into account the different countries of the use which one makes of a plane or an ULM, what one seeks,
The high performance, the safety, the economy, the robustness especially when it takes age, are weight carried, autonomy, adaptation of skis and float,
Another important point, ease of steering strong crosswind
the new generation of pilots and instructors are reluctant to fly tail wheel aircraft.
If I rely on my experience among the pilots around me (those who fly a lot, a 150 to 200 hours in 4 months winter on ski), he is looking for a robust aircraft, easy to maintain, which takes off generally with ULMs, engine Rotax 912, an aircraft that can rarely exceed the administrative weight (the north is great, it takes fuel from heavy clothes, repair tools and a survival kit.)
Regarding the cruising speed alone on board or two on board there is practically no difference, the difference is a little on takeoff and especially the rate of climb.
What pilots prioritize when choosing their aircraft
Reliable engine
Robust cell
Short landing takeoff
Airplane rear wheel to put down skis
4 hour battery life
the cruising speed in general between 160 to 200kmh but not at the expense of takeoff.
to have a structure which allows a weight carrying largely superior to administrative weight (which is an aberance for a two places, like the ZIT in France) the administrative weight must not penalize the structure of the plane, nor constrains the manufacturer to materials dispendieu kind Titan carbon fiber ect ..
A number of landing gear in too thin tube of 4130 that must be repaired in full wood we know what it means light fragile ..
high performance planes designed for city and asphalt runways this is not what pilots from the north are looking for,

ULM broken down (ignition of 912) on this lake
we were in the direction of kawanata


repair with many tools and materials.


Not even accessible with this means of transport. it would take too long

[Michel Kieffer]

André,

Here are photos that make you dream!

In addition, you recall the more than essential importance of the specifications. The specifications are the starting point for the design of any aircraft.

That said, you highlight different points that should be common to all aircraft: ease of control, maintenance, robustness, durability…

Michel

[Michel Kieffer]

New document: “micro tests for macro results”.

The micro tests are carried out in addition to any calculations (aerodynamics, resistance of materials, etc.). These micro-tests are a prerequisite for testing the entire aircraft.

As for the resistance aspect of materials, the need for micro-tests is increased by the low safety coefficients required in aviation:
- 1,5 for the structure outside of all connections;
- 1,5 x 1,15 = 1,725 at the level of the links.

Combining calculations and micro-tests in this way makes it possible to improve the "empty weight / take-off weight" (MV/MD) ratio, guaranteeing the minimum weight of the structure. This is all the more important since any drift of the masses is amplified by the spiral coefficient (or mass amplification coefficient) described elsewhere. But you have to keep in mind that it's not a question of going easy… to the detriment of safety!

The examples presented below are not exhaustive, it is the role of designers to imagine which tests to perform, in addition to the calculations, and how to perform them.

Check http://www.hkw-aero.fr/projet.html

Michel

[Grelinette]

I'm reactivating this topic because I have a question for the ULM specialists:

How many ULM type aircraft are there in France?

Does anyone have an idea of ​​the number or a way to get this information? (perhaps by the number of clubs in France)

please

(I'll explain later why I'm asking this question)

[Christophe]

Hi Grelinette!

It should be here: http://www.ffplum.com/

No?

Hold on here already http://www.ffplum.com/accueil/194-accue ... -2012.html they speak of 14 pilots...

So you can be almost sure that there are less than 15 microlights in France

Paramotors, there is one per pilot (at least )