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Title: Biofoam catapult 8inch glider Post by: B.karthik on July 18, 2009, 10:15:38 PM hi friends i have made a 8inch wingspan biofoam(4mm)catapult launch glider.
materials: 1.biofoam of 4mm thick 2.bamboo for fuselage 3.balsawood for fin problem: 1.foam of wing bends when launched with full stretch by catapult solution: 1.given a reinforcement in the wing with 0.2cm thick woodstick used for home-cleaning. question: 1.shall i need to give reinforcement for tailplane? 2.what are the materials can be used for reinforcement? 3.how should i groove in wing for placing the stick for reinforcement accurately? thanks karthik Title: Re: Biofoam catapult 8inch glider Post by: tg on July 19, 2009, 12:44:31 AM The groove can be made in more than one way.
1. Take a piece of stick of the same dimensions as the spar and stick fine sand paper along the width. Use this to "sand" the groove. Keeping a scale along the line where the spar sand the groove to the required depth. This approach will take some time though. 2. Use a new knife and make a groove. Then use approach (1) and sand the groove to shape. 3. Use a mildly hot soldering iron and then use approach (1) to sand the groove to shape. I've done approach 1 on a foam glider a long time back and it came out very well. Search the net and you will see many approaches. Title: Re: Biofoam catapult 8inch glider Post by: sahilkit on July 21, 2009, 10:11:01 AM normal clear tape is good for wing reinforcement.just use 1/2 inch wide tape near 25-30% of wing chord top/bottom and make the wing placement thing using normal foam should give you good support n still be light weight .
remember one wants to keep his glider as light as possible ! sahil Title: Re: Biofoam catapult 8inch glider Post by: saikat on July 22, 2009, 04:51:42 PM Your glider is too small
It is apparent you are a beginner - try making one of at least 12" span - also biofoam is not the ideal material for a cat glider wing. If you have to make it out of Biofoam then make a wing with some sweepback - like a fighter plane the planform of a hawker hunter wing would be ideal. this will help it handle the high launch speeds. all the earlier posts re: reinforcement should be considered. Title: Re: Biofoam catapult 8inch glider Post by: anwar on July 22, 2009, 05:00:00 PM I got into RC/aeromodelling too late, and my current schedule does not allow me to experiment with such gliders :(
It would be great if you can post some videos. PS: I have lots of time to fight in favor of Futaba ;D Title: Re: Biofoam catapult 8inch glider Post by: flying_g on February 17, 2010, 07:35:35 PM since its a very small glider..use a hollow carbon tube for reinforcement..even a 1mm thick solid carbon tube would do...rc dhamaka has sum carbon with them..and sincd ur into scratch building now...i wud suggest order a few carbon rods(hollow and solid) ans stock it...always comes handy to aeromodellers.. :)
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