UK-Cherub Forum
Cherub Chat => Calendar Events => Topic started by: simon_jones on October 25, 2010, 09:38:36 AM
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WHAT....2010 Sticky Weekend
WHEN....27th/28th November
WHERE..Weston Super Mare
The chance to bring Projects, and sort out the things you've been meaning to get around to all year.
Alternatively come along and support the class effort for the Hall of Fame, many hands make light work!
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i can come for the sat, but have a walk for D of E on the sunday :(
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can i make a boom and spinny pole????? or just one or the other
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As always we are happy to collect any material needed form Wiz (you pay, we collect).
The mandrels are with us at BGM, so both could be an option.
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I would quite like to fill, fair and respray my foils, as some saw at the weekend they are a little battered! I have no materials so will need to buy everything, either small amounts from people or properly, anyone have any, filler, spray paint?
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Great stuff John,
I'll help you with that. I might also be able to get Sarah to help too.
You will need a roll of heat shrink tape. We found the 20mm-25mm wide rolls are best. The 50mm wide roll that I now have left dosen't give such good consolidation. We have recently been cutting this in half to do small items but this would be a major head ache for a boom or pole. Ask Wiz if he can provide.
Let me look out our cloth cutting list for both the boom and pole and I'll send to you.
We applied the final layer of weave in a second hit. This allowed us to fair any wrinkles left in the uni by the heat shrink.
I can also collect from Wiz if required.
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lifesaver phil
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Once my wallet has recovered from a recent car purchase I will get on the case and pay my class fees and will be there. Hopefully I can get the materials from my parents place and can make some bulkheads for the slug.
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Another good sticky weekend project that requires several pairs of hands.
I would spend some time either making templates for each bulkhead to nest on the sheet of foam or draw these at scale to work out the size of foam sheet that you need. The beam of the slug and E5 is not too disimilar so the size of the panel required will vary with the height of the spine and bulkheads. you can get E5 bulkheads out of a 2.3m by 1.15 m sheet of foam but have to do some clever cutting and gluing to get the right shape of panels.
Best done with a vac pump. If we are short of vac pumps we can do one of John's tubes with heat shirnk.
One day we will turn up and make all the components of a boat within one weekend.
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We will bring both our pumps and the tea urn. Sprit and a boom can easily be run off a single pump.
We can split the other pump to cover more jobs if we can find a suitable medical supplier of the red bucket vac thingies that sit next to almost every bed in the country. These also stop the resin goign into the pump and the one we have been using has a crack in it. I'll have a look when in London on Wednesday.
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What do you wrap the tubes in when vacing them, I have tried in the past but tended to get seams, unconsolidated bits where there are creases in the bag.
I have always prefered the heat shrink tape, but have recently run out.
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Vaccing Tubes. The headlines are:
1) Only do the inner layer and unis in hit 1. Do the outer layer as hit 2.
2) After laying down the cloth on the mandrel, helically wind peel ply around (we use 100mm wide tape peel ply rolls for this). Pull this tight and get it on neatly.
3) Use a thick breather and a very thin vac bag. Our favorite for this is B&Q dust sheet. Thim bags also need no tacky tape, just form the bag loosely with brown tape and the bag self seals when th pump is on.
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Hi John,
Please find the layups we used for our boom and pole.
I have tidied the spread sheet up and added some comments to help. The required materials for both items are on the third worksheet.
While we will probably be able to use Roland's vac pump I know there are several projects being identified that need the same so if you can get some narow shrink tape it would be a good back up.
We could use Roland's candle wax method to coat the pole mandrel. This may not work so well with the boom because the three sections of the boom mandrel need to be held together. The draghting film and parcel tape layer therfore works best in my view.
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Another good sticky weekend project that requires several pairs of hands.
I would spend some time either making templates for each bulkhead to nest on the sheet of foam or draw these at scale to work out the size of foam sheet that you need. The beam of the slug and E5 is not too disimilar so the size of the panel required will vary with the height of the spine and bulkheads. you can get E5 bulkheads out of a 2.3m by 1.15 m sheet of foam but have to do some clever cutting and gluing to get the right shape of panels.
Best done with a vac pump. If we are short of vac pumps we can do one of John's tubes with heat shirnk.
One day we will turn up and make all the components of a boat within one weekend.
Thanks for the info.
My bulkheads will be smaller as I am going for the low floor and foredeck option!
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A quick reminder that EVERYONE attending the sticky weekend MUST be a member.
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Does that include my dad?
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In the case of enlisted parental oversight and transport, a sensible appraoch will of be taken. ;)
People are welcome to join on the day.
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So I get an idea of numbers for booking the Indian, who's coming?
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A quick reminder that EVERYONE attending the sticky weekend MUST be a member.
As I have said, I will be paying my fees if I can make it.
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I will be there, now with only a daggerboard to fair, as the t foil is dead
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In the past, wasn't there an option to pay 5er as a one off thing?
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No - tenner - so there is no point in not joining as an associate!
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Hi Paul, I'm coming but I don't have a project so will be an extra pair of hands to help where needed.
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Sarah and I are coming, we will bring Locos T-Foil to fair, but hope to do far more chatting and wandering about seeing what other things are happening.
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I have some chop strand mat and am hoping to have a chin scratch about different ways to make molds.
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I sadly will not be able to attend this weekend any more as I have got an interview which buggers up my plans beautifully! I hope that all goes well and look forward to seeing the fruits of your labour!
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Good luck with the interview.
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Sarah and I are coming as are dean and simon.
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im coming with my dad, not sure whether we will be staying long enough for the indian, ill get back to you ASAP
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Has anyone attending the sticky weekend got any sparbond that we could blag/steal/buy/swap for beer,
we only need a small amount for the mast foot.
Cheers
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Think so. Small quantity. It will be good to go and have a look!
W
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thanks everyone, particularily phil, for the help today. Im gutted i cant be there tommorrow, have fun unwrapping my boom, pole and gantry, hope it goes well!!!
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Hi John,
The gantry came out nicely. The concept of removing the mould from the gantryworked very well and required no force. It needs trimming and probably a bit of carbon plate to thicken up were the rudder pin and gantry pivots go through.
The boom came off the madrel with some help of the fork lift. In areas the uni looks at bit dry in the side walls of the boom. The boom weighed in at 870grams. Using the spreadsheet and knowing what cloth we used it should weigh 910 grams. We achieved 23% resin by weight. The target is about 30%.
My mistake was not suggesting that we wet out the uni on both sides before putting these layers on.
To rectify this I intend to sand down the boom to remove the peal ply release agent and open any other dry areas. Then with Roland's help I will vac a further layer of uni and weave to finish it off. Vacum bagging may get more resin to penetrate any remaining dry areas. This should result in a boom that is as strong as intended in all areas and possibly stronger in others.
The pole appears to be be better but we could not remove it from the mandrel. The problem could be due to the tape reacting with the release wax. An issue I was not familiar with. Again Roland has offered to try to remove it by aplying some heat.
Not the ideal result but certainly not an unsalvageable failure.
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A stick up on a spar is far from unheard of. Careful dremel work all the way down one side has resulted in successful spars before now!
Sorry could not make it.
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phil, do you want the carbon back then?? i can send it if you want
also, ill assume the forward section of the boom was ok?? it seemed fully wetted out?
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I'll let you know john,
The forward part of the boom was ok and had a good ring to it.
We may have to cut the pole off but we will try all other options before this.
The boom and the gantry have been in the warm for another 24 hour and are much stiffer than they were on Sunday morning.
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by cut off do you mean dremel a line lenghtways, prize it off, then re-build the surrouding layup?? i.e. what some people do with rudder stocks?
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Cut inline with the uni-s, probably only need to be baked for a bit to get the wax to soften.