Marblehead Racing - Page 181 - RC Groups
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Mar 18, 2017, 06:43 PM
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Last edited by breakwater; Mar 18, 2017 at 07:54 PM.
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Mar 19, 2017, 01:12 PM
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That's impressive looking data Breakwater!
Was it the Viper?
How big is the sending unit?
What make and model so that I can look it up.
If you had other boats out sailing together in the same conditions
maybe some sort of handicap system could be worked up.
Keep up the good work!
Mar 19, 2017, 02:23 PM
Registered User
Thats the Viper.
Im using the Spektrum DX6, and corresponding telemetry units. It records to the SD card in the DX6, but then you have to be something of a computer nerd to know how to massage a .tlm file type to useful data.

I just came in from sailing, as I was out with another boat Ive got- trying to gather something of comparative data. Unfortunatley in big breeze the C-swing rig burried and jib filled with water, then snapped the jib boom. No good data this time, just stuff to fix. Conventional rigs are so much better after the A
Mar 19, 2017, 02:38 PM
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What was the wind speed?


Mar 19, 2017, 03:14 PM
Registered User
Yesterday was great. It was an A- Conventional Rig on a Viper. Air was very steady about 10 and some good rides goofing around while a friend minted a US1M

Today was a different boat in 16- gusts to 28, Boat went fine, but C swings stink.
That data will clear to something different soon, since its a 3-day observatory.
Mar 19, 2017, 04:46 PM
Registered User
Thanks. One more question: why the variation in the altitude curve, or was it recording something else?


Mar 19, 2017, 06:05 PM
Registered User
Start and finish are walking down and back up a gangway. variation is theoretically waves as this was in the ocean. Tide was incoming so gained a couple feet through it all. Flatline is a break to warm the digits.

Went back out with a B-Rig but had to stay in the shallow end since it's cranking and the C-Busted out in the dark water. Broke the Logs into two parts by accident. This is a different boat with a B-Swing and more swells today than short-chop.

Part 1:

Part 2:
Mar 19, 2017, 08:16 PM
Registered User
Very cool. I've been sidelined with a bug for a few days
so I didn't drive down to watch you today.
Mar 21, 2017, 03:23 PM
Will fly for food
davidjensen's Avatar
I found it interesting to design a set of sails within the rules and see the true difference in measured area compared to the actual area.
Mar 30, 2017, 11:14 PM
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NZL756's Avatar
Breakwater what exactly is this graph telling you and how does it help you sail any faster?
Mar 31, 2017, 08:44 AM
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I'm fairly certain one may be able to answer their own questions that may arise in regards to its use.
Apr 12, 2017, 09:19 AM
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Marblehead Nationals 2017

The Marblehead Model Yacht Club is hosting this year's Nationals at Redd's Pond May 20 and 21
May 02, 2017, 03:01 PM
Thomas Armstrong
Hi all:

I've just finished reading this entire thread (yup, all 181 pages of if, took about 4 days), and I am amazed about how many M designs there are out there... I took the time to record every posible design mentioned here: There are 151 designs listed!!! Many have photos and plans.

Also, regarding the different rule changes over time, and the different rules in different parts of the world, I decided to simplify, and just say they are all Marbleheads. :-)

@breakwater - looks you got an impressive set of material.... would love to take a look...

This is work in progress.. so if you want to collaborate... click on "(add)"...
May 03, 2017, 10:38 AM
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Marblehead data base

Hello Thomas,

Regarding the nice review you made, is the displacement hull only, or the total, including vin, bulb and rudder ?

Would you mind to add my latest addition as well:

Page 180, #2695 and2698.
Pleae call it Black Magic, not Marlin.

All the best,
May 03, 2017, 01:12 PM
Registered User
hiljoball's Avatar
Originally Posted by tarmstro

This is work in progress.. so if you want to collaborate... click on "(add)"...
Here is another addition to your list. Pterodactyl by Chris Dicks. and scroll down.

Originally designed for vane sailing, I modified the boat for RC by changing it to a balanced 'spade' rudder. I sailed the boat to second place in the Marblehead Word Championship in 1975 in Gosport UK.


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