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Old Aug 09, 2015, 09:32 AM
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This Focke Wulf "Ente" flew well until I smashed is at hand launch.
I had to modify the canard. The elevator flaps are too small by far in scale size. I had to more than double their area. But even with allmost no reaction on elevator it was easy to control ... by throttle.
Easy flying, even capable of a controled spin, just a bit fast for this size of a model (500mm span).

The Ambrosini S.S. 4 has bee a very fast model. Too fast for hand launch. besides there wasn't anything to ge a hold. So it was launched by bungee.
This model also had poor response on elevator but much better than the Focke Wulf. But once in the air it was a pleasure to fly it.
Its last flight was very short. Someting with the receiver went out of order under the acceleration of the bungee and the model roled to the left befor it came free from the rope. It got spread over the whole meadow.

The next canard project will be the Henschel concept study.
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Old Aug 09, 2015, 10:35 AM
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Originally Posted by no Depron View Post

The next canard project will be the Henschel concept study.
Interesting concept, but can you tell me why you have the vert stab underneath?.....I'm a beginner and just want to know what difference that would make in flight.
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Old Aug 09, 2015, 10:44 AM
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Yes, even if it's in the "experimental" category, weight and balance sheets are there. They just don't tell me anything about the relationship to the trim setting, which I normally (RC) tend to use as an indicator for CoG placement.
Moving CG back always results in less required up-trim for a given level-flight power setting.
As long as you don't end up aft of the aft CG limit, you should be good to go and you'll require less up-trim AND you'll have less drag (an almost inconsequential amount, but nevertheless less).
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Old Aug 10, 2015, 08:12 AM
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Originally Posted by nuteman View Post
Moving CG back always results in less required up-trim for a given level-flight power setting.
As long as you don't end up aft of the aft CG limit, you should be good to go and you'll require less up-trim AND you'll have less drag (an almost inconsequential amount, but nevertheless less).
Thanks. I would expect less drag, ánd especially I wouldn't mind lowered turbulence from the canard wing, which in itself, I'm sure, would improve main wing airflow. I'm am aware though, that the wing load of the canard must be higher than on the main wing....

Also, and equally important, the take off distance / distance to rotation should be reduced, which certainly is not a bad thing on a Long Eze
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Old Aug 10, 2015, 01:34 PM
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Interesting concept, but can you tell me why you have the vert stab underneath?.....I'm a beginner and just want to know what difference that would make in flight.
Not I did so. It was Henschel.
The downwards orientated fin should protect the propellers from touching ground when the bird rotates for takeoff.
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Old Aug 22, 2015, 01:00 PM
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1:1 canards

A couple of Long Ezes at a local airshow. They were given the finest parkings: in front of the tower and next to the Spitfire




Long Ez at 2015 Stauning airshow (0 min 32 sec)


There was a larger canard plane as well:

Saab Viggen at 2015 Stauning airshow (0 min 27 sec)
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Old Aug 22, 2015, 05:19 PM
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Thanks for those Mike!
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Old Aug 23, 2015, 03:20 PM
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Mike-o

Do you happen to know the incidence angles of Rutan's Long EZ relative to the thrust line? I like for my canards to cruise at zero elevator trim which requires some positive incidence in the canard.

Charles
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Old Aug 23, 2015, 03:31 PM
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I built mine with the thrust line at zero compared to the main wing chord and the canard at +2 degrees.

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Old Aug 24, 2015, 06:01 AM
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Mike-o

Do you happen to know the incidence angles of Rutan's Long EZ relative to the thrust line? I like for my canards to cruise at zero elevator trim which requires some positive incidence in the canard.

Charles
Charles, I didn't build the Long Ez myself, but I went through the manual and drawings to see what they say. I could find no direct reference to an incidence angle, only a reference to a build template, which will position the canard correctly. Let me check with the builder...
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Old Aug 26, 2015, 01:06 PM
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You should not go to too much trouble. I would not be surprised to find that the canard and wing are both parallel to the thrust line.
Since the CG of the EZ is well forward, it seems that the ship under stall conditions would simply mush without any danger of pitching nose up as a canard would without strakes and with a wing at the rear would. The high aspect ratio of the canard should assure that it will stall at a lower angle or attack than one with more chord. I read where the EZ requires UP trim in the rain.

Charles
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Old Aug 27, 2015, 07:07 AM
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Thought you guys might like to see how this one came out: http://www.rcgroups.com/forums/showthread.php?t=2489266

Technically, it probably qualifies as a canard, but it probably is more likely to be termed a "box/joined wing" or "tandem wing" design.
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Old Aug 27, 2015, 03:08 PM
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nuteman, That is an interesting design and appears stable. Thanks.

Charles
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Old Aug 27, 2015, 05:18 PM
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nuteman, That is an interesting design and appears stable. Thanks.

Charles
Thanks, Charles. The deign is loosely based on the Elytron. It was most definitely not an easy build
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