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clivee1

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About clivee1

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  1. Hi Michele, I am glad you liked the Cherubs. You should have introduced your self. See you next year. Clive
  2. And power will go up with V cubed
  3. Try direct heating. If you can get a large soldering iron on them, preferably with a bit of silver solder to make a wetted thermal contact the heat will soon break down any glue. The heat will not conduct far into the fibreglass. The resin breakdown will be at the interface to the stainless.
  4. And increase righting moment. Touchdown could be interesting. Greenbird did it effectively for the land sail record.
  5. We could pull the leeward shroud on rather than letting the windward one off. Still wound not make tacking any quicker.
  6. Hi Simon, It is certainly possible. It would add a lot of complexity that I am not keen on and would do nothing to speed up our tacks. I has also considered canting the foil by letting the leeward dagger board rise a bit. A more practical solution might be to attacher our trap lines much lower down the mast. Plan A is to do more sailing this year. It was in the garage for a lot of last year and early on a lot of days were missed waiting for easy conditions. Clive
  7. I designed the 600 this is not a 600.
  8. Unfortunately Seats are banned. Though I do want to sail a Canoe before I am much too old. I suspect that it really needs practice and possibly someone younger on the helm. Looking at the Pics we should be able to get the mast tip a meter to windward and still have significant pressure holding us to the gunwale even without sheet loads. We are finding that the roll rates are a lot faster than when low riding. Our rigs are very light. If we crack off slightly in a header, whilst going up wind the higher CoG whilst foiling makes it roll to windward much faster and similarly to leeward when luffing. It therefore requires a lot more action on the main. At the moment I am still playing the main. It is a skill Alex has not yet learnt. We tried swapping earlier this year but I suspect that it would be better if he tried it in something like a 29er rather than a foiling Cherub to start with. One advantage of trapezing is that whilst clipped on you cannot get near the foils. Our next mod is going to be to move the mast step forward and sail with a smaller jib, bigger main and a more raked mast so that we do not have to move aft as much during gybes. We have successfully gybed on the foils a couple of times but the transom collapses 99% of the time.
  9. It would be great to know a bit more about this boat. It is fantastic to see people trying new solutions. The additional righting moment from having the foil to leeward looks useful. Also looks very useful having the angle on the leeward foil so that the lift is vectored in the right sort of direction. As RobG said it might need more. At least the main foil is not dragging you to leeward as soon as you heel. We are finding it very hard in the Cherub hang on when heeled to windward but the more windward heel we get the faster it goes. My experience is that the heave stability generated from surface piercing dihedral is not as positive as a wand controlled system. We were not able to race until we had sorted the control. Our foil tips are in a similar position though not as far out. We do not feel unduly threatened by them. We are far more scared of a potential high speed impact with the rig. I agree that there has been limited success with 2 man foilers but there has been limited development effort put in by a very few people. We are at a stage with the Cherub where we can win races, at times by significant distance, but are not yet consistent enough through an event.
  10. UK Cherubs Foiling in Class with twin wires and 14 year old crew.
  11. Thanks Clive. Very helpful. Couple questions for you: A. What was the wind speed that day? B. Were you in an Aero? Rig size (5, 7, or 9)? C. Mind me asking your weight? D. X axis = distance traveled; Y axis = boat speed, right? E. Do you optimize control lines for the tack you're on? (upwind vs. reaching vs. downwind)? I admit to being a lazy sailor that optimizes control lines for the first 15 minutes or so and then says "screw it - I'll just put them all at some generic setting and forget about it." I'm just asking so that I can get a feel for how much better I might be able to do by optimizing control line settings. Wind speed 15 to 25 kts. Quite gusty. Aero 7. I normally sail the 9. There was a 9 out. Very little difference in performance. the 7 was faster upwind. 90kg D. Correct E. Yes. Not much gain in real terms but crucial if racing.
  12. Recorded GPS speed profile for a sail in Chichester Harbour when HISC club racing was called off 31/5/2015.
  13. The water is getting cold, its viscosity is higher, the flow does not stay attached. Move somewhere hot.
  14. We fitted a mk 2 foil to our Cherub for our recent nationals. This had an increase in span from 1450mm to 1750mm just below our max beam. We reduced the area very slightly to 0.204m^2. We modified the camber line on the DAE41 section to add some reflex to reduce the movement of the Cp with changes in Cl. The increase in Aspect ratio makes it a bit less practical. We need help lifting it off the Combi trailer and have to be careful when rolling to rig. It should have significantly less induced drag at take off and at upwind speeds. We got to sail with it once before the nationals. It was quite clear that light weather take off had been improved. With the 9m code zero kite we can possibly fly in less wind than the Moths. Without it we need a little bit more. It was also clear that the changes to the camber line have helped and that we could run with less wand pressure and still retain control during take off etc. At the Nationals we were unlucky with the conditions. On the first 2 days we had near drifting conditions. Occasional we could get foiling downwind but were pretty uncompetitive. On the third day we had some wind. We won the first race convincingly whilst being very cautions. For the second race the wind dropped. Somehow we got to the windward mark third without foiling but lost a lot downwind with the small kite. On the last lap the wind returned .We took off and got back to 3rd. We were leading the next race when the jib cleat fell off. A part that had been there for three years and had nothing to do with the foils. On the final day it was 20+ kts and large waves so we went surfing. When flying we are faster than the conventional boats but not by a huge margin. At every design choice we have chosen ease of use and extended wind range over speed. There is a lot of refinement that we can do. 'Conventional' UK Cherubs are not slow boats in medium conditions. Looking at the photos we need to try shortening our trap lines and sailing with a bit of windward heal. Since the nationals we have managed to win am open pursuit race in perfect conditions at Hayling starting 10 minutes after the 29ers.