k. add it to the lost of boats to be built. Rule ambiguities to be clarified as gentleman by swords or pistols. Seconds to arrange.
fine by me. you draw the gun that shoots across the atlantic!:zbeer:
Heh, just getting back to this thread finally. I guess I missed the single sail restriction when I was asking about the Micro Magic. Oops. That would be a major mod. The hull would probably fit at an angle since the keel doesn’t look too long.
Good luck with your rules.
just to note, the rule has been modified to reduce the min. displacement to 725g [from 925g] this, [many thanks to Angus’s clear reasoning] should reasult in a boat that is a bit more lively, while still retaining the ability to be a fun boat to match race…:graduate:
these are the two sail logos i am playing with… which one does everybody like? the other thing is that sail numbers are to be no less than 31.71mm high, and no less than 6.35mm apart. i will post the rules with the sail identification rules as soon as i draw them up…:graduate:
Great idea, this new class.
I fail to see the reason for so many rules.
I think that it should be kept as simple as possible.
Lets say, hull dimensions are limited by box, aditionally you define smallest displacement,
Electronic are limited to two chanels, and you must use standard servos.
And you limit sails to one mainsail,and hull appendages wich protrude from the box.
everithing else is allowed.
It is best to keep it as simple as possible.
tallastro brought to my attention that 31.71mm is rather small and hard to see, so, the rules are changing to make the min. height of the sail numbers 55mm. thanks tallastro!
crashmir, what you say has merit, but wht i am looking for in this class is a rule that allows for quite a bit of freedom, yet still forms a “type” of boat. also, as i have said, in the interest of cost, keeping control to two channels seemed the right thing to do… as for the rest, that is a double-edged sword, while opening it up has adventages, -fewer rules disputes, more room to build the “ultimate boat”, etc. it also creates a boat that after some period of time get so specialized that it loses its charm, because it is all about the lightest gear, the deepest keel, the rudders that hang 6 inches off the back of the boat… however, i appreitiate your thoughts, and some of them may find their way into the final draft of the rules! thanks!
:graduate:
i am trying to up load the latest rules for the M505, but i keep getting an “invalid file” message… whats up?
now it is too big to attach… maybe i’ll move it to my website at web.mac.com/johncsparkman
however, here it is for perusal, the only thing is that the logo is not in the right font…
M505 class rules V 1.3.6
A. [General]
- The class is an open class: anything not restricted or prohibited is permitted.
B. [General Measurement]
B.1
-The boat, in racing trim shall fit into a box 505mm long and 252mm wide and 305mm deep. - The following may extend out from the box:
Rig – mast/boom/sail; either bowsprit OR bumpkin [not both] up to 50.8mm; antenna [and attached fittings].
C. [Hull]
C.1
-Hull shall be of monohull design.
C.2
- Min. displacement: 725g
C.3 - Hull registration number shall be permanently –through painting on/engraving in/moulding in- inscribed on either interior or exterior of the hull.
D. [Rig]
D.1
-Rig shall be restricted to a single mainsail.
D.2
-Mast height shall be no greater than 140% of the length of the boat. [Measured from where the mast breaks the deck up.]
a. “B” rig shall be no greater than 100% of hull length.
D.3
- Prohibited: More than one bowsprit/bumpkin. Having both bowsprit and bumpkin.
D.4 - M505 logo* shall be placed on both sides of the sail.
D.5
- Sail identification numbers shall be no less that 55mm tall, and be spaced no less that 6.35mm apart.
a. Boats with numbers 01,10,08,80,18,81 shall show the prefix “1” in front of their number unless there is a conflict at an event.
E. [Conditions for racing]
- During an event:
a. Ballast shall not be moved in reference to the hull.
b. No more than two rigs shall be used.
F. [Radio]
F.1
-Radio gear is restricted to two-channel radio control; sail control, and rudder[s].
F.2
-Rudder servo will control the rudder[s] alone.
F.3
-Sail control servo will control Sail alone.
F.4
-Batteries must be housed inside the hull.
G. [Appendages]
G.1
-Except for the rudder[s] the following are prohibited: moveable or retractable hull appendages.
G.2
- The rudder[s] shall fit into the measurement box, but may be turned 90 degrees to do so.
G.3
-Materials shall not be of density higher than lead: 11300kg/m3.
*M505 logo: [must be enlarged by 200%]
M505
hopefully i’ll have it up by later tonight!
for those of you who don’t know my site is,
web.mac.com/johncsparkman
WOW another class!!! Just what we need…LOL
I like small sailboats, easy to make and stow away in the car.
I looked at the Micro Magic for a long time, just my type of sailboat. No one around here sails one that I know of. If I still lived in Buffalo, NY, well, could cross the border in 15 minutes into Canada where they do race them. That’s about 1000 miles from me now…
The 505 class, just suckered me in. Have to build one now…another project…plenty of wood kicking around, have a day off on Sunday…will see what I can cook up.
Great companion boat to my Footy’s. 
Sven
P.S. How about starting a yahoo 505 user group?
SVEN, if you wanted to either head that up, or tell me how to do it that would be awsome! building one, you are ahead of me! i still have to enlarge my plans… as far as i know, Angus has said he will build one, and there is a guy on the rcgroups forum who is building one, and there is me, who will hopfully get one going asap… we are gonna have a class here before we know it!:zbeer:
Ok, I’ll start the group, hence be owner. The owner, moderators have the power to control the site. I can always transfer ownership to you or if wanted.
Since your the originator of the 505 class, you’ll want to be the moderator. We can always have 2 moderators if you like.
What would you like the groups name to be?
R/C 505 SAILING
505 CLASS R/C SAILBOATS
or?
Let me know what you guys decide, then I will get it going this afternoon.
Should make an interesting class.
Sven
Sven, i’d love to share moderatordom with you! lol. and what do you think of R/C M505 sailing? [i don’t want to get in trouble with the big 505 guys…] thanks Sven,
B
Anyone interested in joining, please sign up. Make a post, up load designs, pictures etc.
The site will be built with more info over the next few weeks.
http://groups.yahoo.com/group/RCm505Sailing/
Happy sailing
Sven
One of the intersting problems of the M505 is how to make the brute hang together. I can see ballast ratios being very high if lightweight electronic and batteries are used. The usual model yacht response to this is to have a single common ‘cell’ taking the mast and keel loads.
But in this case, the mast is somewhere way up in the eyes of the boat. Anyone got any elegant ideas?
angus, i read you to mean that, since the mast and keel are going to be seperated because of the mainsail only rule, the question is how you support both mast and keel? if that is the question then these are my thoughts… i referance the laser a lot, but it happens to have a lot in it that is usable in these types of boats, namely the very strong mast step that allows the mast to rotate, and the very strong centerboard trunk. i went to vanguard sometime ago, and chip was kind enough to show us around the plant. from what i could see, the daggerboard trunk and mast step are not supported by massive bracing, they make use of strong fiberglass layups. and the suckers never break. i figure if this can be done in a laser, we can do it on a M505…
i hope i am answering the right question!:scared:
The weight of a piece needed to join the keel box and the mast step should not be excessive, even without the use of exotic materials. At a rough guess, it would need to be about 10/12 cm long.
Btw, I hope the Vortex style tunnel hull is still OK; if not, I’ve wasted a morning sweeping up foam dust, with a lot more to come.
i think i added a defintion into the rules… i’ll have to check, but basicly, a tunnel hull becomes a multihull as soon as the top surface of the tunnel breaks the plane of the floating waterline. hope this helps! [and i sincerly hope all that foam dust wasn’t for naught!
Barrett - structural problem is that you have a lot of bending moment on the fin toot. These boats are going to have the best part of 650 g of ballast - with a neat solution. With a not so neat one, you cold be talking about a ‘mere’ 610 g.
Barrett, fortunately the vacuum cleaner laps up polystyrene dust. However, I had understood from the thread on RCGroups, http://www.rcgroups.com/forums/showpost.php?p=6809320&postcount=86 that it was acceptable. Anyway, I don’t want to get this all controversial, so I’ll just bin the project. It’s not as if I were going to compete in any class races.