Re: Sonic FR 11 Long Mixer Test
Posted: Wed Oct 10, 2018 10:18 pm
No. But now I see what is the problem.foilholio wrote: When the mixer fully extends to depower, B hits a limit. This limit affects the depower of the kite. The mixer and kite bridles will shrink to reduce the B limit. This has a large effect on the kites performance.
When fully depowered and when kite has a mixer of sufficient length pulleys travel on their lines as far as they go. Limiting factor is not pulley line lengths but kite itself, kite takes as low AoA as its design orders or allow; as far as backlines are not restricting this movement. Depending its design kite flies now on A line row only or if it is too much for the stability of it some tension has been left on B lines too. Many kites suffer frontal collapses at this stage, even more so if it is gusty or kiter is not careful.
B line row usually moves only 1:4 (or less) of the bar movement, so in practice there is no risk its pulley line would be too short resulting "B hits a limit". FS uses pulley lines of about 1m, which allows huge movement plenty enough for biggest kites and longest sheeting ranges.
If kite has stability issues it can be worth a try to make a limit for B, to restrict B. Then kite has fixed AB for some lowest degrees of AoA. Some depower is lost, but if kite is too unstable at low AoA's this loss is theoretical. Years ago I tried this method but after all it is a kind of hack fix for not so successful design.
It is good to remember mixer is in the neutral position when flying lines are equal, which means bar is fully sheeted in. From the mixer point of view this could be something else as well - actually if it was pulley lines could be made shorter but this "saving" wouldn't be so essential.
This is because of the kite is distorted to lower camber. In other words when bar is sheeted out there is too much tension on B and even on C. When powered up this situation is not getting much better (or not at all). It becomes worse if Z is loose making it engage later.foilholio wrote:Kite will fly slower, depower less and stall easier.