IOMICA Forum

Richard, In addition to your ‘one sailor’ argument, and building on the ideas expressed by Ray and Marko, I would argue the case this way. The reference in the rule to ‘one receiver’ refers to a device. A device has a name, a function and an implementation. The DX 6 and DX7 are sold as a sin...

I sincerely apologise to anyone who may have been offended by my use of the word ‘dumb’. I was not referring to any person. I was referring to my opinion of what I percieve to be a narrow interpretation of the rules. Smart people can do 'dumb' things; like when I used this word in a poorly phras...

This discussion highlights the difference in the approach to running the class. The differences exposed here, are far more important than the question raised. The Spectrum is quite a different issue to the Texalium and sail manufacturing items that have been quoted in this sorry thread. When a manuf...

My reading of the DX7 documentation is that there are two receiver circuits which function together as one receiver to improve signal descrimination. That the manufacturer has chosen to place the receiver circuits into two connected boxes is just a packaging and antenea orientation issue. I see noth...

Thanks Andy.

Are there any limits on the placement of a mast strut?

Can it be higher than the lower limit mark?

(I see that there is a limit on checkstays if used - but I cannot find any similar limit on a mast strut)

For Canadians who want coverage of the Louis Vuitton Cup and Americas Cup, here is part of the reply I received from TSN, who has the Canadian rights. Unfortunately, they have chosen not to broadcast it over the TV network, but are making it available through the Internet, for those of you who have ...

Great photos!!!

Is a carbon fiber rudder shaft permitted? Is the rudder shaft part of the rudder and so covered by the materials specs. of the rudder section(E.3) ? Or does that refer only to the rudder blade? In which case, which section covers the shaft? D.2.3 Fittings? E.3 KEEL AND RUDDER E.3.1 MATERIALS Materia...

Thanks Andy. I did not pick up on the word 'fitting' in the phrase kicking strap fitting.

I empathize with your position. Inexpensive parts should be encouraged. I can buy a CF arrowshaft for less than $10. It would make a great boom. But the rules say 'No'. Some parts of the IOM rule are open, some parts are closed. Your question touches an area of uncertainty in a closed section. Cost ...

The kickingstrap occurs in two places in the rule. In addition to F6 where it is part of the running rigging, (and must operate in tension per ERS), it also occurs in F.4.3 MAINSAIL BOOM FITTINGS (a) MANDATORY (3) Kicking strap fitting. In this setting, there is no requirement to operate in tension....

As Lester points out there are a list of items in F3.3. Some of this list is covered in the relevant subsections , for example, There is a section for booms and an allowed materials list for boom fittings, same for running rigging and for standing rigging, and for deck fittings. What appears to be m...

Andy, I think you have it right! Spreader material is not defined and so cannot be made of anything! (conversly, if the are not present, they can be made of anything :lol: ) I think there are several items that fall into this hole, including other mast fittings that are not covered under the topics ...

I understand the IHC concept as it relates to producing a one-design hull and rig and sails. There are many measurement points and templates involved. What I was getting at is can the IOM class or National Authority designate measurers, and by extension designate sailmakers as measurers? The sailmak...

Is there a difference for a sailmaker between being IHC and being a measurer? The IHC certification sounds like an expensive process, acceptable with big boat costs and margins, but overkill for R/C? What is wrong with having a sailmaker be a measurer and provide a measurement certificate with the s...

Congratulations and thanks to the folks who did the website and the photographs. Very enjoyable.

Thanks Bruce. Now I understand. I did more research in the rules and found that the checkstay is limited to 100mm from the mast heel. This limit gives the checkstay a different purpose that that used in big boat sailing. (Hence my confusion, as I knew that only one set of shrouds was alllowed and a ...

I am building my rig and have a question about checkstays relative to Rule F5.2 (b) (1). that states (1) Pair of checkstays if a mast strut is not fitted. What is a mast strut? Is a mast ram the same as a mast strut? If 'yes', then I am not using a mast strut. What are checkstays? Are they another n...

My background is somewhat similar. I used to race Marbleheads in the 1970's then went fullsize racing for 25 years. After retiring I am returning to R/C sailing. I did not want to spend 4 figures on an IOM, so I am building one from scratch. From the MYA site, I downloaded the plans for the Triple C...

I would expect that if the angle of travel is increased, the power should stay the same. I would expect the change to be the travel time "stop to stop". That should increase proportionately to the increase in the angle. More travel should allow you either to use a shorter servo arm (reducing stress)...

Thank you to those you replied to my question.

The consensus was that I grind down the lead to get to the desired weight. So that is what I have done. I'm almost there, just a few grams to go.

Thanks

Thank you to all who replied to my question.

My second molding attempt using silicone caulking seems to have worked, after leaving it for three days to cure.

If the silicone turns out to be too fragile in use, then I'll try to recast using a molding rubber.

Thanks again

I want to bring my lead bulb down to its final weight. I plan to drill a 3/8th inch hole. How deep does the hole need to be to remove 39 grams? Can someone check and confirm my logic and arithmetic lead bulb weighs 2427 grams Target weight is 2388 grams so weight of lead to be removed is 39 grams A ...

I would appreciate any suggestions for making a bow bumper. I have made a master out of balsa and cast a plaster mold. I put some vasaline in the mold as a parting agent. I filled the mold with silicone sealant. It set on the surface but did not set through after 24 hours. Should I layer the silicon...

I assume that you are talking about the Spektrum DX6. I read through their technical info and there is nothing to indicate that the receiver is also a transmitter. So there is no conflict with the IOM rules as I see it. The transmitter finds the open frequency. The receiver is trained to 'lock' onto...

Hull design is always a compromise. It is dangerous to blindly follow the shapes of full-sized boats as there are other factors at work (eg the weight of the crew on the rail of a wide boat can be very fast). A wide transom with a flat run aft promotes planing. However this usually causes an increas...

I used to race R/C sail in the 1970's but switched to full-size yachts. Now I am retired, I am returning to R/C sail racing. I am new to the IOM class and am scratch building a Triple Crown. As I have no R/C equipment, I am starting from a clean slate. If you were starting over, which radio equipmen...

Here are a couple of web sites with basic tuning tips.

http://www.myrc.org/Library/Library.htm

http://www.solingonemeter.org/tune/soltune.php

( while this is intended for the Soling 1M, the general concepts apply)

I think the important issue is what can we learn from this scenario. When I started to learn the racing rules, I read that there are two kinds of ‘protest’ situation; win-no-win, and win-lose. If there is no contact, then you may win the protest, or it may be disallowed…ie win or no-win. Howev...