Hi there,
cheers again from Italy.
Yesterday the blokart of Alessandro "Gassa" reached 75.4 kph on a flat surface - our "little Ivanpah" - in Sardinia, one of the main islands, together with Sicily, in Italy. The blokart was naked (no pod) with a 4 squared meters sail . The wind was about 30 kn, with gusts at 40 kn. Actually, the pilot was so oversailed that just after the record, sailing on free wind, a gust made him capsize. Well, the blokart needs some fix... the pilot is ok. Some pics on www.spazioforum.it/forums/tractionkite-about795-0-asc-0.html. On the same spot we're going to have a meeting on September. Now the challenge is on, so I'm thinking about some modifications to my Seagull MC.
Now my questions are:
- Don't you find pretty boring that FISLY has only an "unlimited" landspeed record? Wouldn't be better, interesting, challenging and funny to have different classes?
- A technical question. I've followed the Greenbird issue and I find one of the most interesting detail of the thing is the downforce generated from the upwind axle. Do you believe that at high speeds having mobile surfaces on the trailing edge of the axel - a sort of ailerons, differential, generating lift on the downwind wheel and downforce on the upwind wheel - could be an efficient way to prevent the yacht from tipping over at a very low cost in terms of drag? Silly question?
Thank you, cheers
Enrico
No silly questions on this forum Enrico I am sure there are some who know more about aerodynamics will like to pursue this question I look forward to their comments
regards
Hiko
We held a speed trial at Lake Lefroy last year. Each Class had its own speed recorded over 2 days. The results are on the landsailing part of this Forum.
www.seabreeze.com.au/forums/topic.asp?TOPIC_ID=56102
Ithink this is the corect link.
Something like this. In my opinion it could work only at high speed and with a very wide axle to avoid turbulences from the hull.
As regards the weight, well, I just don't know. Must a pure record breaker be light or heavy? I don't know the weight of the Greenbird, the Ironduck it's not a feather and Millett Denning didn't care at all! Coronations were sheer heavy metal. Strange things happens when we're talking about speed record. The flight speed record of the racer Macchi MC 72 lasted 55 years (I'm talking about prop single engine aircraft) despite it was a seaplane. And it was a seaplane mainly because it needed an endless surface to get speed and take off.
@ test pilot 1 In those speed trials did you sail the same yacht you usually sail for fun or in a regatta? Wouldn't be nice and challenging to have, for instance, an international Class 1 for landspeed record with a maximum weight up to 40 kilos, and see a Potty! or a Ludic with a tiny wing sail and the pilot dressed like a superhero? I absolutely don't want to collect a megabudget and spend 10 years of my life to put my name after Bob Schumacher and Richard Jenkins! Give me a chanche with a smaller size!
Cheers - Enrico
Thats being brave !
I agree - speed records for each class is a good idea 0 but lets not start an arms race, it is supposed to be fun !
The idea behind all the classes we had last year was that most kinds of landcraft could be accomodated , and we could still do other thing with the yachts, like the marathons, and get some good results. We had wind recording gear set up a few days before the " official weekend" for the really keen people who wanted to go real fast, but the wind was too strong
so all the speeds recorded were in regular yachts.
as a means of raising funds for the clubs insurance, we charged a small fee for those who wanted to record their speeds. By using GPS you could sail in one class, say mini, hand over your best result, clear yor tripmeter, get it inspected and jump into another class of yacht,say class 5 and have a go in that class. all within a few minutes. those without a GPS just sailed the races , and there was no disruption to the program.
For next time I think we may reduce the number of mini classes as the divisions we set were probably unnessassary.
the flaps were tried by skeeter iceyachters to overcome their inability to turn, but it was later dropped when they started sitting infront of the mast.
the surface area of greenbirds axle was way bigger than the wing surface, and worked fine as long as you had the angle of attack right.
But the disadvantage was that the pressures could reverse and it would become a lifting wing, very,very quickly richard snapped off the axle assembly on one occasion on lefroy, and his fix was to add massive blocks of lead, That weighed about the same a my own yacht Vindicator