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Have you seen this one:
http://brooklynaerodrome.com/ I saw a book about this design in the public library here. You haven't steered me wrong yet though so I'll probably go for your design. I also have a BluSail with a 70" span for more practice. Sea planes and sail planes. |
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The idea behind simple deltas is that they are a quick , easy disposable build for non self righting flying practice . If a simple delta airframe is crashed beyond repair , you can quickly and easily and inexpensively build another airframe . If built prop-in-slot , pusher , or elevated motor pod , the electronics are protected and almost always survive crashes ..... and can then be transferred to a new airframe . You don't even need to make it a delta shape , you can just put electronics on a sheet of dollar store foam with elevons and a vertical fin ...... although it's more difficult to get a proper CG ( CG needs to be set at 20% ) . A simple delta needs the CG set at 40% . Here is my " flying sheet of dollar store foam board" :
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I picked up "Leo's RC Simulator" on Google Play. Pretty good free app with good reviews. I think it is on Apple also. They have an aircraft called "Depron 1" and also a Slo Stick. Both of those are on the free download. I think it is better on my 8" tablet than my phone.
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If you want to get a Slow Stick , they are available again : https://alofthobbies.com/slow-stick.html A SlowStick can be a GREAT flyer with a couple of tweaks : 1) The Slow Stick has a LOT of positive wing incidence , so put 3º of down thrust on the motor/prop .... or use a motor that has barely enough power to fly the plane . 2) Secure the servo tray so it can't move forward/backward on the fuselage stick . If you don't do that , the rudder & elevator will be constantly out of trim . |
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By the way, I continue to follow this excellent thread. I've built five or six of your wonderful planes. Several have gone to new or inexperienced flyers. To the degree that I'm aware of what's out there, I think the EzFly is the best trainer available, bar none. And you do an amazing job of graciously guiding us in our builds. Thanks you! |
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I'm not the designer of the EzFly ( Motorhead is ) , but I do enjoy helping people ( especially beginners ) achieve successful flight with an EzFly ...... so I post in this thread often . |
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Don't forget the very important tip : secure the servo tray so it can't move forward/rearward on the fuselage stick . |
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I had lots of successful flights this morning - 2 batteries worth. Even though I hit the car once on landing. It seems to be porpoising and tending a tiny bit left even though I put a tiny bit a right rudder. When I throttle back to about 1/2 it does much steadier. The new control horns which cut down the movement work great. I have to move the stick about 1/2 way to get a gentle turn.
So for a pusher to get some down thrust, I put a washer under the 2 lower screws and an additional one to give some right thrust. Correct? Thanks again for all the help. |
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Adding down thrust or right thrust doesn't really work on an EzFly due to the limitations of the prop slots . And the motor is too close to the CG for down thrust or right thrust to have any effect ( very short leverage arm ) . On a plane with the motor/prop on the nose ( further away from the CG ) , down thrust & right thrust have much more effect ( longer leverage arm ) . |
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put the washers on the upper mount screws , so that the motor shaft points slightly downwards. |
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Airfoil Wing Leading-Edge Covers
My EzFly Trainer didn't seem to fly very well. It felt sluggish and wouldn't climb much at all.
My hypothesis is that the blunt wing leading-edge isn't contributing to good airflow over the wing. To help I decided to try applying an air-foil leading-edge to see if that would help things. I remember seeing some posts about people cutting and sanding the foam into a better leading-edge shape. I decided to try 3D printing the forward portion of the NACA 2414 section and glue them onto the wing. I choose the NACA 2414 since it is a good airfoil for model planes (and I happened to already have the coordinates for another project...). I installed the new leading-edge today and went out for a quick test-fly just before dark. The plane seems to fly noticeably better. It will climb nicely on about 3/4 throttle where before it would struggle at nearly full-throttle. I need to get some of my flying buddies to try the plane and see if they notice any improvement before I make any definite conclusions. All the files are at: https://www.thingiverse.com/thing:4010523 |
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