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Old 13 October 2010, 12:56   #11
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jobs a good un.

drawings attached if anyone needs them
Attached Files
File Type: pdf Vipermax A - Frame Support Arms.pdf (112.3 KB, 104 views)
File Type: pdf Vipermax A - Frame.pdf (115.8 KB, 197 views)
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Old 13 October 2010, 12:59   #12
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Downhilldai - úlots but quite fair for the amount of detail work involved

If I say it out load it makes it real and the wife can read!


One reason for the A-frame was to protect the aerials when towing dinghies. Any one notice the deliberate mistake?


Richard
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Old 13 October 2010, 13:08   #13
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Any one notice the deliberate mistake?
You built your garage too low?
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Old 13 October 2010, 13:18   #14
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Very nice! There's a lot of very awkward detail gone into that, I won't say what I'd charge for it

Couple of Q's, were the ratchet mounts modified from an off the shelf jobbie then welded on? If so any problems welding or special procedures etc used? I had considered this on my a-frame but as the mounts are made from cast stainless of unknown properties I figured there was a limited chance of success.

Also the 14 TPI gps mount, is that made from an off the shelf unit as well?

Looks great though, proves my theory that form comes with function
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Old 13 October 2010, 14:04   #15
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Garage too low. Nearly!

When I designed the fixed frame for the northcraft I measured the clearance above the stern with the jockey wheel extended (i.e. bow up). of course when its on the ball the bow is down. I ended up with only a few mm to spare........

Hence the tilting one the this time......

The mistake was chopping off the aerial with the a-frame. Seconds after I first mounted it on the rear supports, I turned around to get some rope to hold it in place. It fell backwards and sliced through the aerial which was resting on the gutter. Doh.

Martini - The aerial fittings were off the shelf but they're not taking much load. The ones carrying the radar reflector (heavy), flag and GPS are fabbed. No idea about the welding questions. Mark asked about the aerial fittings and I sent them down for him to check them out. Ask again in a year's time!

Richard
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Old 13 October 2010, 16:58   #16
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That's one thing I forgot about on mine ... some bits and pieces tacked on to tie stuff on like ensigns and flare containers. Still, I ain't sending it back now

What size aux are you using? pretty big prop on it!
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Old 13 October 2010, 23:08   #17
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the aux is the high thrust (i.e. lower prop speed / higher torque) version of the Yam 9.9 (FT9.9). Designed for being a small yacht engine. Much better suited for being an RIB aux than a standard version imho since we are doing about the same speed.

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Old 14 October 2010, 05:05   #18
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the aux is the high thrust (i.e. lower prop speed / higher torque) version of the Yam 9.9 (FT9.9). Designed for being a small yacht engine. Much better suited for being an RIB aux than a standard version imho since we are doing about the same speed.
What sort of speed does a beefy aux give you - do you get through the "hull speed" or is there still a cap on it at about 5 kts? I got the Saildrive version of the Merchatsu 4hp for the same reason.

Is the A frame completely rigid once it is all rigged or do you get any rattles? It's a great bit of design
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Old 14 October 2010, 14:30   #19
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Still about 4.5 to 5 knots but it does it into waves and wind. Just feels right when going along - its difficult to describe.

Frame seems rock solid so far. Not had it on the water yet though. No rattles and very little flex at the top.

The idea is that the all four bolts are nipped up once it is in place to make it secure. Only takes a few seconds.

Richard
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Old 15 October 2010, 08:35   #20
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Quote:
Originally Posted by Richard Selman View Post
Downhilldai - úlots but quite fair for the amount of detail work involved

If I say it out load it makes it real and the wife can read!


One reason for the A-frame was to protect the aerials when towing dinghies. Any one notice the deliberate mistake?


Richard
Nice neat job! The trouble with ''one off'' commisions is always the price,not SO bad when you DO get what you want though!
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