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RE: RC multihulls? - 11/24/2007 10:46:13 AM   
andrew k


 

Posts: 58
Joined: 8/28/2007
From: seafordvictoria, AUSTRALIA
Status: offline 		thanks tricat...out of curiousity i will try the 45' on my current rig and look at where that point is in relation in the morning...
cheers
andrew

(in reply to tricat)
       Post #: 376

RE: RC multihulls? - 11/26/2007 9:16:28 AM   
Midget



Posts: 1532
Joined: 11/9/2004
From: perth, AUSTRALIA
Status: online 		Hi guys
Im up to making the cross beam on my Cat, But i'm not sure what to make it out of, so it
will be strong and light.
Ive though ply or fiberglass...But im thinking fiberglass will bend and so will ply, so
im out of ideas.

Thanks

(in reply to andrew k)
       Post #: 377

RE: RC multihulls? - 11/26/2007 7:07:36 PM   
Dick L.



Posts: 59
Joined: 2/28/2007
From: Twin Cities, , MN, USA
Status: offline 		Midget -
here in the States, I found and use 1/2 inch diameter (12.7mm) carbon fiber straight wall tube. You can get a 60 inch (1524mm) long piece for around $18.00 - or you can look at Kite Stores and they may have the same but 48 inches (1219.2 mm) long for around $10 each.

The long one also works fine for a mast - or use two short tubes with a ferrule/joiner in length. My first boat (not a great performer but scaled after my big cat) used aluminum tube. Kind of heavy compared to the CF tubes. If $$$$ too much, look at a fiberglass tube. A bit more weight, but less cost.

Probably a high shipping cost, but here is an idea of sizes and costs. Note they also sell heavy weight rip-stop nylon or polyester fabric by the yard for sails if you decide to make your own. I use the 1.4 oz. stuff. A bit stiffer than the lightweight 3/4 oz. spinnaker cloth.

The Kite Shop

You should have similar shops there in the UK for the kite-builder guys. Lots of cool building stuff at pretty good prices.

Dick

(in reply to Midget)
       Post #: 378

RE: RC multihulls? - 11/29/2007 8:53:02 AM   
Multiman


 

Posts: 31
Joined: 2/1/2007
From: RedditchWorcs.., UNITED KINGDOM
Status: offline
As for my boats, there have been pics on here already, you can also go to one of my websites.
http://www.apolloboatservices.co.uk

I have been producing Cats and Tris since 1994.

Good Day!

Multiman


<mod edit - adjusted for tone>

< Message edited by Justaddwata -- 12/2/2007 7:12:53 PM >

(in reply to Dick L.)
       Post #: 379

RE: RC multihulls? - 11/30/2007 2:25:39 PM   
Dick L.



Posts: 59
Joined: 2/28/2007
From: Twin Cities, , MN, USA
Status: offline 		We need a lot of co-operation if we ever expect this "multihull thing" to take off and be viable classes around the world. New sailors will blow off the class/threads if they see this kind of bickering going on over a mis-stated/mis-interpreted statement. Save this stuff for important things. An argument over this is easily answered by reading the rules which say a "maximum" for beam and length dimensions. In actuality, nothing prevents Tricat (as example)from racing his M1M within the Mini40 class - there are no minimum sizes - only maximums. What actual dimensions others are using for thier boats seems to be a logical question.

let's get on with the reason we are here - r/c multihulls, their improvements, building techniques, race results and new ideas. Both of you have too much info and experiences to share


<mod edit - adjusted for tone>



< Message edited by Justaddwata -- 12/2/2007 7:15:03 PM >

(in reply to Multiman)
       Post #: 380

RE: RC multihulls? - 12/1/2007 10:01:26 AM   
tricat


 

Posts: 53
Joined: 12/30/2006
From: leedsn/a, UNITED KINGDOM
Status: offline 		Hi Midget,As DickL is talking about f48/Mini 40 size,re cross beams and sizes,I will give you an idea of what I use on my testbed 1M Multi.Both fore and aft beams use 1/2metre 8mm carbon fibre tube with a 1metre 6mm tube running through it[or whatever your beam requires].The 8mm is secured to the centre hull the 6mm tube is just taped up to stop it from sliding through.This allows you to dismount the floats easily for transportation if needed.This arrangement will handle 3.75lbs of hull in any weather without any problems at all.One point about carbon fibre is the ends of the tube do require binding or in time they will crack.I use electricians tape[a couple of turns will do]To give you further info on strength,I can pick the multi up by the outrigger float no trouble nothing gets strained, so they have plenty of stiffness in them when you need to lift it out the water in awkward places. Regards Tricat

(in reply to Midget)
       Post #: 381

RE: RC multihulls? - 12/1/2007 4:29:22 PM   
Multiman


 

Posts: 31
Joined: 2/1/2007
From: RedditchWorcs.., UNITED KINGDOM
Status: offline 		Dick L

I utterly agree that ANY Multihull below what are Class Rules in MINI40 can be entered for any race in the MINI40 Class. That was not the question as I understood it.



<Mod edit - edited for content and tone>

< Message edited by Justaddwata -- 12/2/2007 7:17:32 PM >

(in reply to tricat)
       Post #: 382

RE: RC multihulls? - 12/1/2007 5:58:12 PM   
Dick L.



Posts: 59
Joined: 2/28/2007
From: Twin Cities, , MN, USA
Status: offline
quote:

ORIGINAL: tricat
As DickL is talking about f48/Mini 40 size,re cross beams and sizes......


My apologies for not specifying the F-48 size versus the 1 meter size.

Although I do use the same diameter carbon cross beams on my 1 Meter multi only because I had a bunch of tubes already purchased. On that one, I too use tape wrapped around carbon tube for locating left/right location on main hull and as "stops" for float attachments. The carbon tubes are held inside the glass tubes on top of the floats by the rigging. Mirror hanger are screwed to outside of the tube (wood dowel inside) to which the "Y" harness for side shroud rigging is connected. Hopefully photo will help explaining this method. It is a glass tube mounted tot op of float into which the carbon tube is inserted. A small wooden dowel is pressed inside the carbon tube and the hanger is screwed to the wood.

Cheers



< Message edited by Dick L. -- 1/29/2008 1:51:55 AM >

(in reply to tricat)
       Post #: 383

RE: RC multihulls? - 12/1/2007 6:05:06 PM   
Dick L.



Posts: 59
Joined: 2/28/2007
From: Twin Cities, , MN, USA
Status: offline 		Multiman - my point was only an example of the rules I suggested would have covered the entire size issue. For both the Mini40 and F-48 Classes, the rules specify maximum dimensions - and it was my point to show a smaller size (or boat) still met the rules.

To clarify "my" reasons for a narrower than allowed beam is the hope that tacking will happen faster and all three bows will cross the eye of the wind faster by being closer together than if they were further apart. My focus direction is for a fast tacking boat and I will give up a wider beam to achieve that. If I find it wasn't helpful, I can always widen the beam out to it's allowed 48 inch maximum (1.2 meter) size. Hopefully that will also address Andrew's post of the difference in maximum beam compared to a less-wide beam?

Regards - and keep the ideas and suggestions coming.

Dick

(in reply to Multiman)
       Post #: 384

RE: RC multihulls? - 12/2/2007 6:53:16 AM   
andrew k


 

Posts: 58
Joined: 8/28/2007
From: seafordvictoria, AUSTRALIA
Status: offline 		multiman,
i had wondered why my post got you on the wrong foot to start with,
my post was never to come across as to whether you have any boats, or boatbuilding experience,
if you took it that way then i apologise, but that was not my intention...
anyway,perhaps "everyone" can move past this issue now and we can start freely discussing
rc tris again...


i looked at your website,the boats look cool, have you got any other images or webpages to look at...
cheers
andrew






(in reply to martno1fan)
       Post #: 385

RE: RC multihulls? - 12/3/2007 10:13:52 PM   
Dick L.



Posts: 59
Joined: 2/28/2007
From: Twin Cities, , MN, USA
Status: offline 		In email correspondence with both the moderator of this forum thread, as well as the forum administrator, the concensus of opinion/view was that they want to see positive posts that encourage the hobby to be an interesting one and to help membership/participation grow. Dissention and disagreement IS ALLOWED provided it is done in an adult and courteous manner.

I think the "hinted at" message reply from both of them was that if in disagreement, state your "opinion of the issue" (not a personal view of the other poster). Better to not repond, than to begin taking on an edge of personal attack which will easily be grounds for having the post edited or removed.

Since this is such a great site for sharing of ideas and information, I strongly encourage all to heed the suggestions from the guys running the forum and thread. We all can learn MUCH regardless of how experienced we are or think we may be.

Let the ideas and discussion continue ................ please?

(in reply to Justaddwata)
       Post #: 386

RE: RC multihulls? - 12/4/2007 10:02:29 AM   
tricat


 

Posts: 53
Joined: 12/30/2006
From: leedsn/a, UNITED KINGDOM
Status: offline 		Hi guys,In reply to an earlier question Midget asked what to use for the cross beams.DickL answered this question in full.It also brought up the question that if certain materials bend too much
what could he use.Multiman mentioned laminates.This method is like ropes the more strands [too a point]the stronger it is.It allows curved shapes to be made,it gives great strength,the only thing that may go against it is weight.As I personally have not built any laminate fittings of the type required,
I would rather have someone in the know advise how to build this type of cross beam.
In my dingy days one of the solid ash ribs[2" by 1"]continually broke in heavy weather.It was replaced with a laminate rib 4 times 2" by 1/4" ply strips.the ribs in question are still in good condition 56yrs later.O-ooops I will give my age away?????

Regards the other matter.As DickL says Let's keep the info coming in for the benefit of all. Regards to all. Tricat






(in reply to Midget)
       Post #: 387

RE: [Deleted] - 12/7/2007 5:50:59 AM   
Ron Olson



Posts: 13024
Joined: 5/10/2002
From: Kalamazoo, MI, USA
Status: offline 		As an addition to what Justaddwata stated, a few of the members in here have shown their hand as being sellers of sailboats or other RC related goods. For those of you that are dealers please review the site rules concerning those of you that are in the RC business. I know who you are and expect you to conform to the RCU rules or face Moderated Status or banishment from the site for failure to comply to the rules that you agreed to when you signed up here.
Any questions, PM Matt or myself.

Now, back to the program already in progress.

_____________________________

Member, Southwest Michigan Model Boat Club.

(in reply to tricat)
       Post #: 388

RE: [Deleted] - 12/9/2007 11:49:52 PM   
Dick L.



Posts: 59
Joined: 2/28/2007
From: Twin Cities, , MN, USA
Status: offline 		Hey Ron -

thanks for the reminder.

It might be worth the effort to look a bit deeper into signatures and claims. In the SAILING multihull r/c world (this topic/thread) - most who claim to be builders are what I affectionately call "HOBBY BUILDERS" - you know - those guys who do some design and building in basements or garages - and when done, offer the boat to recoup costs for materials and labor to allow a build of a new idea or design.

I have been in the mulltihulls r/c hobby since 1999 - and into r/c monohulls and big boats much, much longer. A review of those who claim to be builders are NOT production builders, and certainly don't make a living off of what they do build and or sell. If I knew of a viable source of buyers for an r/c multihull, I too would consider myself a "builder" - considering I have done about 6 custom r/c monohull builds for friends, I guess I too could be in "your category" of a "builder".

I know of only one US production company, and to my knowledge their total sales of a production trimaran "might" be 8 units. Ummmm - call me silly but this is NOT a production builder selling his products on a high annual volume. The company MicroSAIL is still considered a home builder. While I understand you want to resist the urge for companies (or dealers, manufacturer's reps, etc.) to post free sales adds when the forum could be gaining reve