UK-Cherub Forum
Cherub Chat => Tech Chat => Topic started by: Neil C. on June 10, 2012, 10:44:52 AM
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I'm in the process of re-rigging a mast for 2631, an old Proctor cut down to length. Most of the fittings, gooseneck, spreaders etc will need moving up a fair distance to their new positions. I recall there used to be a rule of thumb for hounds height - I think it's 75% - but is this measured from mast base, sheerline or gooseneck? The spreaders are then positioned half way between the lower reference point and the hounds - is that right? (Old style single spreader rig with single trapeze and 3/4 height kite hoist).
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I'm in the process of re-rigging a mast for 2631, an old Proctor cut down to length. Most of the fittings, gooseneck, spreaders etc will need moving up a fair distance to their new positions. I recall there used to be a rule of thumb for hounds height - I think it's 75% - but is this measured from mast base, sheerline or gooseneck? The spreaders are then positioned half way between the lower reference point and the hounds - is that right? (Old style single spreader rig with single trapeze and 3/4 height kite hoist).
It all depends on everything else... In particular how much movement there is in the bottom of the mast.
As far as hounds height is concerned you are trading power against gust response. Lowest hounds I've ever see were on the bethwaite wing mast, which were very responsive, highest were on some of the late 80s rigs which could be cows. OTOH of course the higher the hounds the higher the kite halyard could be. Highest was probably Halo's tin rig, which was a Spar M3 (M7 was announced two weeks after I ordered it), and it had all the gust reponse of a telegraph pole, and I wouldn't repeat that. The lighter and less experienced the crew, the lower I would have the hounds for sure.
If you have got the classic 80s rig of prod and lowers with the mast locked rigidly at goosneck height I would do all calculations from there, and have the spreaders two thirds from lowers to hounds. Hounds height, Bethwaite quotes a percent figure in HPS2 which I would not argue with as a starting point, but I can't lay my hands on the book right now.
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Thanks Jim, that all makes sense. I've got a light crew, overly stiff mast and lowers but no prod, so that's all pointing to a fairly low hounds height. I might be able to get away with using the old trapeze T-terminal holes for the shrouds and just move the spreader bracket up a little bit. I'll get the tape measure out again tomorrow night.
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Flat stanley has high hounds. his new shrouds are 4260mm. I hope that helps roughly with hounds height.