K1W1307,
Those are the specs used in the US back in the 60's.
They came from the Land Yachting Bible least ways that is what is thought of the Book. Landsailing..... friom RC Models to the Big Ones. First Printing Circa 1973.

It would seem that we have made a few alterations to then but the Yachts are still very similar just the same.. The Book is worth the read.. If you can get a hold of one.
Ron

PS it is much easier to get through than the Tome was suggested.

It was either a different book or your memories are mixed up.. Us Old Farts di stuff like that.
Ron

kiwi307 said...

Whatever, I have a copy and it's still way out of date (just like SOME old farts like Nikrum?)

Thats not a nice thing to say about Ron!





Even if it is true[}:)]

Hi Blake
How is the new yacht progressing.(we seen to have lost track of what we where discussing here)Over the last week I have rebuilt aus230 from the Y frame forward , I found everything was to far out of alignment, Some how got things wrong while making some frame changes so it was easier to start again, Everything is nice and square now ,I have changed the rear wheel angles to 14% and also made the steering adjustable forward and back so I should be able to get everything balanced now.
Cheers
aus230

aus230 said...

Hi Blake
made the steering adjustable forward and back so I should be able to get everything balanced now.
Cheers
aus230

now were getting there, have you made that skinny front on the seat a bit wider so you can actually move your feet

I wear boat deck shoes so I really don't have a problem. Steering may be a little heaver but that does not bother me much.
I thought I had really stuffed up with the changes I made, it took a couple of frustrating races to get it sorted again, Moved the steering and then it started to preform well again. Certainly better being able to adjust the steering quickly
Cheers
aus230

Hey you fellas on the other side of the Pacific Ocean.... What is with the Alameda Runway?? Damn! Would it ever make a fine Land Yachting Venue?? You reckon you could gain access??
Ron

Yeah! Ok. It is just that I have been watching The Myth Busters tonight. Love it when they Blow S%^t up It was The Presidents Challenge Episode. I thought a Blind Man would see that the Hell Boys Fist part wasn't going to happen even before it was started but people want it done any way.. That series of trials were done at Alameda Runway as they called it so I went to Google Earth for a closer look. Damn I think Paul would commit murder to get a free shot at that sight Hey Paul??
Ron

Nikrum said...

Yeah! Ok. It is just that I have been watching The Myth Busters tonight. Love it when they Blow S%^t up It was The Presidents Challenge Episode. I thought a Blind Man would see that the Hell Boys Fist part wasn't going to happen even before it was started but people want it done any way.. That series of trials were done at Alameda Runway as they called it so I went to Google Earth for a closer look. Damn I think Paul would commit murder to get a free shot at that sight Hey Paul??
Ron

isnt it part of a military base

Here we go again, started to build the new frame for aus230, Not sure how it will go so I have decided to keep my current frame intact in case this one does not work out. main difference is 250mm longer axles and a plume type front.
Cheers
aus230

Paul
Why do we do it.
Pics please.

Cheers
vic

Some time ago we where discussing weights of class5 yachts. I just had a look at the plume factory class5 and there yacht comes in at 62kg. so I guess our yachts are not to far of the mark. Site can be translated to English (use Google translator)


www.plumefactory.fr/yachts/5-5-sport

not sure how this center of effort thing works. Any diagram's on how the measurements are taken and where does the pilots size and weight come into the effect. All quite new to me and I should imagine there would be plenty of others interested.
Cheers
Vic

aus230 said...

not sure how this center of effort thing works. Any diagram's on how the measurements are taken and where does the pilots size and weight come into the effect. All quite new to me and I should imagine there would be plenty of others interested.
Cheers
Vic

Hi Vic, in relation to the centre of effort SOLELY, THE POINT IS THAT YOU DON'T MEASURE ANYTHING! What you do is make a scale model of the rig from card, Put a pinhole in each corner, and hang from each in turn. From the same pin hang a plumb line. Draw a pencil line roghly in the middle, then hang from the next corner and repeat. Where the lines cross is the THEORETICAL centre of effort. Previously a method used was to measure the midpoint of each side and run a line to the opposite apex. Again repeated for each side.
The other 2 points of interest for a design on paper are, 1) the centre of gravity with pilot in place, and 2) the centre of lateral resistance. Neither of these have I been able to find anything other than a "suck it and see" method (except huge amounts of complicated maths). Bill Finch showed me his method about 29 years ago and I still use it.
Centre of gravity, balance the whole yacht (with pilot) on a brick and move the yacht back and forwards till you have the CofG noted, it's where it balances.
Centre of Lateral resistance is found by tying a rope on and try to drag the whole yacht sideways (peagravel or wet grass is easiest). With a bit of luck and a fair bit of empirical testing (otherwise known as messing about) you will find this point.
If all 3 points line up, ie Cof E directly above the C of G which co-incides with the CLR, you will have a really sweet yacht with minimal steering input to keep straight. Strangely it also seems to be the fastest ones too!

Nikrum said...

So KIWI 307. You seem to be telling us to build the Chassis, less Mast Step, to the Rolling Stage Fit the Seat and a bunch of weight, to the point of EML (Estimated maximum Load) then start Dragging this lot about the Paddock, Sideways, on a rope until through adjustment you find a point of EB (Equidistant Balance) and at this point the mast Step should be placed???? No?
Ron

As you finished by saying NO. If you can tell me how to have a complete yacht without a mast, mast step and sail, please advise, never have seen it done!
The C of G and your previously unheard of EML (at least by me) are not convergent. The Cof G can be easily adjusted, just move your own weight around. Previously you accused me of not being able to read!!!
Who said anything about equidistant balance?
CLR can be adjusted by weight, tyre size, pressures and any other thing you feel like , but don't put words I never used in my mouth.
Bye Bye Seabreeze, cant be bothered any more.