Here is a list of all the postings Tim Rowe has made in our forums. Click on a thread name to jump to the thread.
|Thread: IOM Boxkite|
A few little jobs to do. Like sorting out the bung.
This was the original arrangement with a retaining string attached to the backstay fitting. I decided to lead the string inside the boat as it would be one less thing to catch on.
Which meant gluing an attachment point inside the hull. This has a dual purpose that I will come to later.
The tiny deck patch covers the top of the rudder tube for good measure.
I didn't know that and it was difficult to see into the bottom of the hole. I will have a closer look and see if I have to round it off. That would mean a new plug if the mast went any lower as the vang gooseneck would hit the deck. What I might do instead is drip some epoxy into the bottom of the hole to make a flat base. If I overdo it I can always take a fraction off the plug.
I am not too concerned about stopping the mast from rotating as the tension in the shrouds acting through the spreaders seems to be good enough. That is the only thing stopping the mast rotating on the Topiko.
Thanks for the heads-up. It sounds like a good idea.
I bet the Ellipsis drawings are exciting. It will be very interesting to see the form difference from the Nimbus.
Moving on to the rig there was a fair bit to do. It had all the bits and pieces but I found out quite quickly that it was not the original or proper mast for the boat. My friend had puzzled over that too. This was not a disappointment however because the spars, fittings and sails were from SailsEtc and all in good shape.
|Thread: Dragonforce 65 Ordered|
That's good Chris
Will you do a little unpacking and setting up blog? I would find that very interesting as I am half toying with the idea for a chuck-in-the-back-of-the-car boat. The IOMs and Galileo need a bit of planning.
|Thread: IOM Boxkite|
Thanks Eddie. I should have said the actual tab was twice as long in the cut state. I was then folded back on itself so it wouldn't stick to the deck.
By moving the winch to the middle section I did create a a bit of extra work.
I has to have a lead-out fitting and as Ray has commented on the price of commercial fittings (in this case around £15 and a long lead time) I decided to make one. The basis is a small aluminium plate with a slot in the middle. The slot houses a short length of alloy tube formed into a shallow S bend. As I don't yet have the facilities for aluminium soldering, the fitting was bulked up with epoxy and micro-balloons and sanded into the shape in the photo. The fitting is bolted through the deck just forward of the turning block that the boat was already fitted with. The new lead-out fitting takes the line from under the deck straight into the turning block and the closeness with hopefully prevent any tangling. It does mean that I have one less line on deck which is a little bit neater.
|Thread: A couple of IOM yachts|
I haven't got the drawing yet so I am not sure. It is possible that I might double plank it first with balsa and then an external veneer of mahogany. I have various stocks of well seasoned wood that I can machine to the sizes I need.
I am quite sure balsa will figure prominently and I will be generous with the original thickness to give me a good sanding allowance to fair things up.
I would like to get into soldering and home anodising aluminium then I could make many of the fittings. I already have pre-bent mast sections from SailsEtc and I shall use their booms and boom fittings. It's a pity the Graupner Regatta sail winch does not seem to be available any more. I had one on my Topiko and it failed. Shame because it was strong and quite fast and not so expensive as the RMG. It also had an additional lead to bypass the supply via the Rx.
It is interesting to note that the closer you get to the front of a fleet the differences in tuning become minute. Good starts, light touches on the helm excellent tactics then make all the difference if applied consistently. Plus of course the hunger to win.
I think it was Malcolm who may have said if you have two yachts on the water you have a race. That's true even if it stays in your head.
Looking forward to comparing notes on the Ellipsis.
What made you choose that design. I am curious.
|Thread: IOM Boxkite|
Getting there with the hull. Deck patches are the next job.
To make the paper templates I marked the edges of the apertures with the side of a pencil lead in the style of church Brass Rubbings. I then added 8mm all around for the patches to overlap. I read somewhere that 6mm was the minimum but that looked a bit skinny and I had 8mm space available to keep them all the same so that decided it. These were then stuck to some ply we use for templates (similar to Lite Ply but a lower quality and the offcuts are generally free) with my favourite method with Pritt Stick.
Here we have the complete set with the forward two doubling up as mirror images.
This is the midship patch template as an example. I told a slight fib as I had to make a small scallop to clear the radio pot.
It is then dead easy to cut the patch around the ply using a very sharp scalpel. The patch material is woven, self adhesive and a selection of colours is available from SailsEtc where I got mine.
I can now get on with the rig.
|Thread: A couple of IOM yachts|
That must have been very satisfying Eddie.
It was for me, just looking at the photos.
There are lots of good tuning tips for IOMs on the web. Two really important features are to have sufficient twist in the mainsail and associated twist in the jib due to the wind gradient. A lot of people sail with two much vang. The second is the relative sheeting angles between the main and the jib. A good starting point for going to windward is the end of the main boom being about 10mm off the centreline and the jib sheeted further out. On the jib for the Nimbus the end of the jib boom will probably be roughly half way between the mast and the shroud. You can control the twist of the jib to adjust the slot using the jib boom topping lift. You will know when you are hitting the sweet spot when it feels like the turbo has cut in!
I must get the Boxkite on the water soon.
Very nice Eddie
The information I have is that you need 270mm of winch travel. The Hitec I have in the Boxkite delivers 3 1/2 turns which is far to much so as I have a Spektrum Tx I had to use the Travel Adjust function, Other makes call it End Point.
Can't weight to see them on the water.
|Thread: IOM Boxkite|
As long as the hull length doesn't exceed 1000mm I suppose it is not too critical how long the bumper is. I would not want to make it longer than 20mm on an IOM and think between 10mm and 11mm is ideal.
I think the idea is that the bumper has to be a minimum 10mm. On many dimensions there are tolerances of +/- 1mm so I reckon 11mm is fine. There would be no advantage or incentive to make a bumper any larger so I reckon Frank is just playing safe for the home builder. He is an experienced designer.
Mine has come out at 10.5 mm again as a tolerance because if you are less than 10 you are out of class.
Have you made a start on the Ellipsis. It is next on my IOM list.
|Thread: 2021 Builds during lockdowns|
A really nice collection there NIgel.
You have inspired me to have a go at my un-started Billing Dragon and make that RC too.
I like the Dolphin artwork!
|Thread: IOM Boxkite|
There has been a bit of talk on Carl's threads about bow bumpers.
This is a reminder of what the original foam version looked like and it had been used in anger with a permanent dent half-way down. It definitely had to go and this is what I did:
I carved and profiled a piece of medium hard balsa that was stuck temporarily to the bow with double sided tape. After fairing and painting, the pattern was stuck to a piece of glass plate (again with double sided tape) and then given multiple coats of wax.
A fairly stiff mix of epoxy and micro-ballons was pasted over the pattern and glass and allowed to gel. The rest of the mould was then made up with odd bits of glass cloth and rovings inside a balsa frame. When the mould was finished and thoroughly cured, out came the pattern. Not in one piece however which was a bit too much to hope for. The mould surface though was good.
The bow area was then masked off to keep the bonding silicone off the paint.
And the bumper taped in places while the moisture curing bathroom type white silicone did its stuff. The bow bumper now matches the hull profile accurately and it now looks the part.
Thanks Chris and Eddie
My friend has more or less decanted back to the UK. He never intended to become a Spanish resident and just enjoyed the freedom of movement. He tried to give the boat back to me but I just can't bring myself to take possession. I am now therefore the custodian and really I am the lucky chap.
It has been a bit of a change from building and in a way, a bit more of a challenge because it didn't start from where I would have done and tricky sometimes to know when to stop.
I am enjoying every bit.
We have a hardware shop right opposite and I try to find what I need there as it will be a lot cheaper than the model shop 35 kilometers away in Palma. Especially for standard stuff like paint. They can mix to a colour chart but this blue was of the shelf and very close to the original colour.
Right from the outset, the plan was to get all the weights concentrated as close as possible to the middle. In a racing yacht it is very important to keep weight out of the ends. It helps on all sailing boats, models and full size. A new tray was needed.
A bottom view of the tray with some Liteply stiffeners.
I have made some progress with the Boxkite so time to report in.
A suitable piece of ply was found for the hole and glued in place using epoxy. The same epoxy was used to seal the underside as it would be tricky to completely seal with paint or varnish afterwards. The brace across the top was a piece of soft balsa held with a couple of tiny spots of glue so it it be broken off easily when the patch had cured. The balsa keeps the patch in perfect alignment with the top of the deck.
When coated with the high build primer the patch disappeared. The paper scrunched up inside was to stop primer getting onto the keel box because I need to stick things on that later.
In this photo you can see the final coat which has a good gloss but has the brush marks and the odd speckle here and there. The bottom has been prepared for final polishing using wet / dry paper used wet going from 400 to 800 to 1200 and finally 1500 grit. This leaves a perfectly matt surface and if you are lucky this can be done within the thickness of the last coat so you don't get any beach marks. It doesn't matter too much because on final polishing these tend to disappear.
The hull was left in this un-polished state while the rest of the work was completed. Two reason for this:
Not just a deck mounted mast either. The mast is held forward by a stay that runs in the luff of the jib and connects down to the deck with a swivel.
The forestay and backstay don't just hold the mast up. Tension on the backstay keeps the luff of the jib nice and straight. That is a lot more efficient than a saggy luff.
I do use a temporary forestay (just a mirror image of the backstay) when setting up. This keeps the mast in the desired position while I fiddle about with the jib arrangements.
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