Originally Posted by
aspeed
I am pretty sure the line groupers were outlawed a long time ago. About the year after they were discovered. The last I checked in about 1980? FAI F2A did not allow them either.There had to be 10mm or something between the lines at the leadouts. Since then they went to longer lines, from 52 to 60 ft. They went too fast for me on 52 ft lines, and I got out, but since then they go faster , and the lap time is still the same. Oh, and I got older too. .4 mm lines , or about .016" is still the diameter for FAI. I believe A speed went up from .020" monoline to .024" or so, and lengthened from 60ft. to 65? because they were spinning pretty fast too.
Aspeed: Please follow this thread thru: ken Morrisey used
groupers to set his British open 10cc record with a sidewinder OS marine based engine (by Henry Nelson)
http://www.rcuniverse.com/forum/cont...f2c-print.html The record is still valid. You can use your own rules, regarding the lines- the lenght of it-fuel etc. Provided your model passes the pull test and the engine is below 10cc. FAI F2A world champs contests is a different matter, that`s true ! Nice plane, nice trophies Ken ! ...
http://www.deluxematerials.com/sponsorships.html The ad copy text has a fault: His speed record stands at 340km/h plus...maybe the 248 reading is miles per hour ???? If I would go after a world cl speed record I would do the following: Have a carbon graphite line moulded with aerodynamic profile. Single strand "monoline" that would taper thinner when going closer to the model. Use NO CONTROL except have the model balance and level itself when flying: Bill Wisniewski`s Pink lady planes with large lifting stab were doing all that. Then just hang to the pylon,let go... Carbon is far stronger that steel wire so a much thinner set up could be used. There is in the rules NO MENTION that you must actually control the model in flight...!!