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Author Topic: Suggestions of plans for my specific needs...  (Read 1138 times)
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Janus33
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« on: May 15, 2017, 02:24:13 PM »

Dear friends hi from Greece!

I have built so far by accident ( my daughter had some left over balsa sheets from a school project and me and my younger son wondering what to do with them and voila!!!) two small catapult gliders this http://www.amaflightschool.org/diy/how-build-indoor-catapult-launch-glider-science-olympiad and this one http://jkon.aeromodelling.gr/ninter-120A.htm .We didn't fly well them because of spare time limitations but there was some interest of my sons side to build gliders like these.So I would like to propose me some plans to built as we are totally new to the sport .
Our needs are for simple builds like the previous we built (because in our country is a bit difficult to find special parts except balsa wood),we need to keep it simple (minimum tools and built time).
Size doesn't matter much but the main problem is that we don't have enough large areas (about a football court or less we are living in somehow crowded  area and there is no indoor space nearby )  .
Also in our country there is no (as far I know) competitions so the models doesn't need to have restrictions of weight size etc they will be built for our pleasure and final specification is to be a good flyer according to your experience .
I am looking forward for your proposals .
Best regards Nick .

P.S. Sorry if my English are bad but it is not my native language.
   
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Coops
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« Reply #1 on: May 15, 2017, 04:53:15 PM »

As another beginner, I've had great success with Chuck Marcos' Easymini 8" catapult glider.

http://www.gregorie.org/freeflight/easymini/

http://img.photobucket.com/albums/v108/Coopdevil/FullSizeRender%2035_zpsq9k5l9vi.jpg

Very easy to build, all straight lines!

For something that looks a little bit more like a real aeroplane another easy build that flies very well is the Bill Dean design for the Sabre F86D

http://outerzone.co.uk/plan_details.asp?ID=8324

I've flown the Easymini and Sabre in a small park with no problems, although one of my Easyminis is stuck up a tree somewhere and another one landed somewhere unseen and never turned up again!

Coop
Suggestions of plans for my specific needs...
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Skymon
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« Reply #2 on: May 15, 2017, 04:57:06 PM »

There are loads in the plans section. The Katze planes are easy, small and fly well. A larger easy plane is Sweepette 8 or Joe fosters 12"
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Janus33
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« Reply #3 on: May 16, 2017, 01:11:57 AM »

So as I understand size limit is 8-12 inch ....
@Coops : That is I think the beauty of these constructions they are so cheap and easy to built that you dont care if you loose it .We have left also our first model on a tree...
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lincoln
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« Reply #4 on: December 18, 2017, 11:34:44 AM »

I shrunk down this glider to 10 inches for an FAC event:
https://outerzone.co.uk/plan_details.asp?ID=3756
It flies well enough. I think maybe 25 seconds in still air when launched with a #64 rubber band. I don't know if you have those over there, but they're nothing special. I made the fuselage a bit lighter than shown, and put a hook for catapult launching at the nose. Sometimes the stab would hit my fingers on launching, so I probably should have used a thin strip of heavier wood at the leading edge. I used to leave one of these in the back of my car. Before it was crushed, the longest flight was a couple of minutes at a sod farm. If you fly in the middle of a sunny day, you may lose it shortly after you get it flying right, but it's satisfying to see something like this fly away. I must have chased mine more than a quarter mile at the sod farm. Maybe closer to half a mile or a kilometer, not sure. If you want more performance, you can use light balsa that's slightly thicker so you have room to sand a good airfoil shape, but then the model will fly away sooner. You may find that the wind is weakest just after the sun comes out, so you can have longer flights without leaving the field. Just before sunset is also good on some days.  But you're less likely to catch thermals, which is awfully fun.

I've found the "Budd Kicker" helpful to make trimming the glider easier. It's easier to set up a glider so that it doesn't loop on launch, but has the c.g. far enough forward that the glide is stable. www.volareproducts.com/PFFT/GliderBuddKicker.pdf

I know some people are making small gliders with meat tray foam:
http://www.gryffinaero.com/models/ffpages/plans/leftover.html
I haven't tried this myself. The foam is much more flexible than balsa, so stubbier, thicker wings may be required, as you can see in this design.

Trimming catapult gliders so that they launch high and have a slow, stable glide is tricky. I set up mine for a left turn, partly by slightly tilting the horizontal stabilizer to the right. Then I launch in a right bank, pointing up only a little. If I get it right, the model sweeps around to the left while climbing very steeply, than transitions to a smooth glide without losing much altitude. I gradually reduce the amount of up elevator and move the c.g. back so that it doesn't loop, but if I move the c.g. back too far, the model will dive instead of gliding. The Budd Kicker helps with this. You can probably find a glider trimming article on line that explains this much better.

It's probably too much work, but a catapult glider that's 14 inches or so can carry a Silly Putty timer. You only need some Silly Putty and two tubes, one that fits loosely inside the other. I don't know if Silly Putty is available over there, though. Look up tube in a tube dethermalizers. I think this doubles the amount of work, and it hurts the performance, but it makes your glider come down after a certain amount of time that you choose.
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