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General Info on Boost, Rocket, and Flex-wing Glider events
Brief Overview of the three Glider types

Boost Glide  - Gliders that boost up on rocket power, and glide down. The glider is allowed to separate from the rocket pod, or rocket it was attached to. Flexible wing surfaces are not allowed.   If a Boost Glider kicks an engine out,  the engine has to have a recovery device (such as streamer) attached to the engine or it will be disqualified as unsafe recovery of the engine. Rocket Gliders are also legal for Boost Glide. 

Rocket Glide  -  Gliders that boost up on rocket power and glide down, which do NOT drop any parts. So, the Rocket Glider has to keep the engine with it, nothing can come off. It is very difficult to get a Rocket Glider to boost straight and transition to glide on their own, so they usually have some physical change from boost mode to glide mode. Such as Slide Wings (wings near the back on boost, sliding forward for glide),  Swing Wings (Wings folded back for boost, swinging out for glide),  Slide Pods (long sliding engine pod that makes the glider nose-heavy on boost, then slide back to shift the CG for glide), or Auto-Elevator models where a movable elevator is flat on boost and moves up to change the glide trim. There are also other ways such as scissor-wings and scissor flop wings. Nearly all such models do that by using the ejection charge to burn a thread or activate something else triggered by ejection. There are also R/C Rocket Gliders which are adjusted for neutral pitch trim for boost, then via R/C change the elevator trim upwards for glide, as well as the boost being piloted.   

Flex-wings - Gliders which use flexible covering for the wings, and fold up for rocket boost. Typical models simply use three spars connected by a nose spring, for a Delta wing design. The glider folds up and is carried inside of a long booster rocket, then at ejection the glider is kicked out and deploys for glide.

See the Boost Glide thread,  the Rocket Glide thread, and the Flex-Wing thread for more information and links for each of these three glider events.

See the next message for more information about gliders, building,  trimming, and aerodynamic stability.
Links for general articles  - How to build, sand wings, trim, and fly Boost Gliders and Rocket Gliders:

Boost Gliders: TR-4 Model Rocket Technical Report  from the Estes website (PDF file). Written by Tom Beach. MUCH useful information about gliders, aerodynamics, stability, trim, design, and so forth. Find out why gliders usually need dihedral (tips higher than the middle of the wing) for roll stability. 

Maxima A Instructions by Ed LaCroix. The instructions by Ed LaCroix are VERY USEFUL for building and flying any kind of glider.

Kevin McKiou's Glider Trimming Tips , from the NAR website.

Basic Hand Launch Glider trimming (from  a UK website)
Video on Glider Trimming, by Tim Van Milligan / Apogee Components.  This is part 14 for the Cirrus Breeze Rocket Glider, but very useful for learning how to trim gliders in general. For Boost Gliders that separate from the rocket, you may need to add or remove some clay noseweight.


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