Fitting the seat riser
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Hi, can anyone tell me if the seat riser is fitted as one continuous length, or if it is intended to be in two lengths fitted either side of the upper frame. If one piece then presumably the upper frame has to be notched to accommodate? Thanks. Peter
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Hi Peter, I would have made the riser in one piece, notched at the cross member, only I didn't have timber long enough so I had to scarf it under the seat tops. Doing it in one continuous length helps ensure everything is lined up correctly. Having said that I eventually decided to omit the forward thwart so maybe I needn't have bothered. Best regards. Graham Sent from my Xperia by Sony smartphone ---- Peter Taylor [via MyMorbic Sail-&-Oar Dinghy UK Network] wrote ---- Hi, can anyone tell me if the seat riser is fitted as one continuous length, or if it is intended to be in two lengths fitted either side of the upper frame. If one piece then presumably the upper frame has to be notched to accommodate? Thanks. Peter If you reply to this email, your message will be added to the discussion below:
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Graham Neil
https://port-na-storm.blogspot.com/
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This post was updated on .
In reply to this post by Peter Taylor
(PW later stood corrected!)
Hi Peter. You are probably referring to the Frame 3 upper section - correct? In our case this was cut from utile. IIRC we decided it was more important to retain full strength in that frame by NOT notching it. Thus I believe each of our seat risers is in two sections. I presume the strakes (planks) are sufficient insurance that the fore-and-aft hull geometry is not compromised by this. Fr 3 is quite near the C/G, so when you are lifting the boat (eg by crane) or stropping it onto a trailer, the integrity of Fr 3 may be quite important to resist inward flexing. You're probably aware we have a forward thwart, and the sloop-rig foredeck, and we find the combination quite serviceable. "Just my 2p" of course. Maybe RP will give his view. ATB PW |
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Thanks for sharing your experience Paul, I also think two pieces might be easier to fit (like the gunwale). That said last night I found a few words in the middle of a paragraph on buoyancy tanks in Fravcois Vivier’s Building instructions instructions saying ‘...it [the frame] is cut around the seat riser…’
One way or another I will fit the riser! ATB Peter
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In reply to this post by Portnastorm
Hi Graham, thanks for sharing your experience. You are not alone in fitting the riser in two pieces - Paul W did the same though for different reasons. I think I will see if I can fit in one piece…might be tricky as I am hard up against the transom at one end and the forward bulkhead the other, with no wriggle room and difficult to keep adjusting and offering up…of course in truth no one would ever see a gap at the end under the buoyancy tanks…but it will irk me if it isn’t a snug fit! So may be two pieces will be better after all? I used to be uncertain but now I’m not so sure…:) Peter
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If memory serves, the aft bulkhead is notched for the seat riser. The central bulkhead isn't, possibly to allow for those who deicide to omit the forward thwart on the Sloop version. I don't think notching the bulkhead will in anyway weaken the hull once everything is glued in place. John Welsford proved that an epoxy joint is stronger than the surrounding plywood by driving over it with his pickup. I'll take his word for it. 😁 Sent from my Xperia by Sony smartphone ---- Peter Taylor [via MyMorbic Sail-&-Oar Dinghy UK Network] wrote ---- Hi Graham, thanks for sharing your experience. You are not alone in fitting the riser in two pieces - Paul W did the same though for different reasons. I think I will see if I can fit in one piece…might be tricky as I am hard up against the transom at one end and the forward bulkhead the other, with no wriggle room and difficult to keep adjusting and offering up…of course in truth no one would ever see a gap at the end under the buoyancy tanks…but it will irk me if it isn’t a snug fit! So may be two pieces will be better after all? I used to be uncertain but now I’m not so sure…:) Peter
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Graham Neil
https://port-na-storm.blogspot.com/
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In reply to this post by Peter Taylor
Ah, yes Peter. Exactly as you say. On page 13/21, under "6.10.Buoyancy compartments". ‘...it [the frame] is cut around the seat riser…’ Interesting.
Maybe my Co-builder/Co-owner will remember what we did. I doubt we have any pictures to clarify. On reflection:- (a) Reviewing some pictures and the plans, the inner gunwale is doubled in that area, to receive the forward thole pin (or rowlock bush in our case), so there would be plenty of stiffness to resist inward flexing of the hull (eg due to craning or trailer stropping). (b) Frame 3, cut close around the riser, is unable to flex inward. “Horses for ...” FWIW - I've added a link to an untidy collection of further pictures from near the bottom of our "Proteus" page. ATB PW |
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In reply to this post by Peter Taylor
Yes Peter, I fitted the seat riser as one long piece then cut out the upper frame to fit around it afterwards.
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Thanks Robin, I have now done the same. Not an easy task... to get the end chamfers and overall length correct, the riser has to be pulled tight into the curve of the hull. A lot of fitting and refitting required. Pleased with the final result though.
ATB Peter
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