|Nov 15, 2013, 12:00 AM|
Syren Old Pics
"Hey Dan do you have your gallant yards braced. I've been looking at your servo set up and only see 2 sets of braces per servo. I'm assuming those are for the courses and tops"
Just the course and topsail yards have braces. The sails pull the t'gallants around.
When using the furled versions of the topsail and t'gallant yards, there is a line run between the yardarm ends to pull the yards around.
First three of pics show the lines from the upper furled yards to the braced yards below.
The second pic also shows a reefed spanker.
Attached a bunch of old pics I found, too. Included close-ups for yancovitch.
Pic 6 shows Paratroopers' Surprise getting blasted by Syren.
In Pics 5 and 7, that's ice on the water in the distance.
|Nov 20, 2013, 07:49 AM|
Picked up a big gun improvement from TBowmans' build thread: use a full 6V to fire the guns and get really fast, reliable ignition.
All Syren gun designs previously had nichrome wire igniters that were a reused, built-in part of the gun. They were heated by a voltage just high enough to fire the BP, but not high enough to burn out the wire. Another reason to keep the voltage low was to prevent a meltdown if the rotary switch stuck on a single gun.
But the new guns use charges made up of soda straws with a single use igniter in each charge. No longer need to keep the lower voltage battery pack for the gun firing circuit!
Tested the onboard 6V SLA battery and it fired over 20 charges in a test gun without a misfire. The lower V batt pack would start to misfire after 5 to 10 loads thru a gun. And the firing rate was slower.
So...the gun battery comes out, the main SLA gets wired to the gun rotary switch, and the switch servo will be sped up a bit. A 9 gun broadside now takes about 10+ seconds. I'll try a bit faster, but not too fast because then it's over before spectators know what's going on.
Another change. A light coat of silicone grease was being used in the barrels to help keep the brass surface clean and clear of melted plastic residue from the straws that hold the charge. Now using silicone based heat sink grease. BIG difference. A very small amount swabbed into the barrels between charges keeps the barrels super clean.
Net: the increase to 6V and the heat sink grease pretty much have the guns super reliable and maintenance free.
Pic of plastic safe silicone/zinc oxide heat sink grease from Home Depot attached.
|Nov 24, 2013, 11:29 AM|
Syren Spar Dims and Sail Profiles
When converting the SC&H model brig Grasshopper to the Syren, it was a loose translation based on the similarity of the hulls. I didn't even think about the spar dimensions and the resultant sail profiles. I just used the Grasshopper kit masts and yards or remade them to kit dimensions.
Jerry Todd recently provided an historic reference for the prototype Syren masting.
I compared those dimensions to the model and based on that, and using yardarm dims to set sail width, drew sail profiles for the model and prototype.
The "look" is very different between model and prototype.
Not drawn, but the driver gaff length difference would also yield a very different driver profile.
Note that the 1807 table shows main and fore upper masts and yards the same dimensions. That seems strange to me, but it's an original table.
Seems interchangability (a la Henry Ford) perhaps was already creeping into American shipbuilding!
The drawings are scale. Seems the model Grasshopper (British) sail area is greater than that of Syren (American). Jerry notes that American Cruiser-like brigs of war carried more sail area than comparable British brigs. This makes me wonder whether the 1807 table dims for the main upper yards is correct. Seems they should be longer than those on the foremast.
If I was building again, I would get the spars and sails matched to the prototype since that's such a dominant feature of the model. I'm bummed that I overlooked it.
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