Author Topic: Hard shell seat recommendations  (Read 481 times)

Hard shell seat recommendations
« on: January 18, 2020, 06:35:07 am »
Morning All,

I'm rebuilding a PDQ from a frame purchased from Kevin at DTek. I live near Stratford on Avon and thought it would be cool to refurb a bit of a local product, ignoring the American origins of course.
All is going well so far, and the budget is staying within sensible (tight) limits. Stormbird has been a huge help providing dimensions and information off his bike to let me make the chain idler and other bits & pieces. However, I think I'm just about to hit an expensive bit so need to get it right.

Has anyone got any recommendations on cost effective hard shell seats? Would appreciate the benefit of your experiences.

Thanks.

Rebuilding a PDQ frame to restart my recumbent collection!

Re: Hard shell seat recommendations
« Reply #1 on: January 18, 2020, 10:38:33 am »
How basic/fancy do you want your seat ??

The homebuilt bents from "Atomic Zombie" tend to just use two pieces of plywood, memory foam and some type of cover.
Look through the tutorials over there for some ideals.
Voyager over in the Cycle Chat recumbent section has a couple of threads where she shows how she makes one like that as part of a full recumbent trike build.

Luck ...........  ;D

Re: Hard shell seat recommendations
« Reply #2 on: January 18, 2020, 11:07:13 am »
How basic/fancy do you want your seat ??

The homebuilt bents from "Atomic Zombie" tend to just use two pieces of plywood, memory foam and some type of cover.
Look through the tutorials over there for some ideals.
Voyager over in the Cycle Chat recumbent section has a couple of threads where she shows how she makes one like that as part of a full recumbent trike build.

Luck ...........  ;D

How basic/fancy do you want your seat ??

Not fancy fancy, but not home built. I'd like a hardshell fiberglass one, but don't have the time, skill, space or patience to make one properly, so I've resigned myself to it costing a few quid. I also don't want to compromise the aesthetics of the bike too much.

There's a fair few on fleabay from different suppliers, and I need a conversation with Kevin at some point as he said he had a couple of sources, but I thought it made sense to cast the net to the experienced populous on here. I know a lot of folk rate the BodyLink seat, but bank balance says no unless somebody has a second hand one at sensible money.


PDQ frame now sourced. On to the build...

Rebuilding a PDQ frame to restart my recumbent collection!

Mr Larrington

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Re: Hard shell seat recommendations
« Reply #3 on: January 18, 2020, 02:26:22 pm »
I'm something of a fan of the old-skool HP Velotechnik non-Body Link seat, with a channel down the middle where your spine goes.  No idea whether they're still available but they probably came out of the same Sheds in Poland as 99% of recumbent composite bits in the opening overs of the millennium.  However, most hardshell seats were intended to be used at significantly more reclined angles than was the norm on the PDQ so I'm not sure how well it would work.
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Re: Hard shell seat recommendations
« Reply #4 on: January 18, 2020, 03:55:41 pm »


I'm something of a fan of the old-skool HP Velotechnik non-Body Link seat, with a channel down the middle where your spine goes.

 However, most hardshell seats were intended to be used at significantly more reclined angles than was the norm on the PDQ so I'm not sure how well it would work.

HP only list the current hard shell seat as you'd probably expect, and having reached out to both them and ICE they don't offer old model anything.

The intention is to recline the seat quite a bit further than the old mesh seat. I'm also planning on deleting the donut and working on a bracket set up a bit like the one ICE used on the or suspended rear Q and QNT to allow the seat angle to be adjusted easily. Having looked at Hercule's posts on cyclinguk.org this extends the boom a bit, cancels heel strike on the front wheel and reduces frontal area.

PDQ frame now sourced. On to the build...

Rebuilding a PDQ frame to restart my recumbent collection!

Re: Hard shell seat recommendations
« Reply #5 on: January 19, 2020, 03:08:22 pm »
Drop Christine at Performer an email and ask her if she's got something old stock.  Their prices are very reasonable, and carriage is OK too.  You could have it in your hands in a week or so.

Re: Hard shell seat recommendations
« Reply #6 on: January 19, 2020, 05:17:27 pm »


Drop Christine at Performer an email and ask her if she's got something old stock.

Great idea andytheflyer, thanks. Have done as you suggested, let's see what she comes back with.

PDQ frame now sourced. On to the build...

Rebuilding a PDQ frame to restart my recumbent collection!

ElyDave

  • Royal and Ancient Polar Bear Society member 263583
Re: Hard shell seat recommendations
« Reply #7 on: January 20, 2020, 07:28:49 am »
Don't forget you will have import duties an vat to pay
“Procrastination is the thief of time, collar him.” –Charles Dickens

Re: Hard shell seat recommendations
« Reply #8 on: January 20, 2020, 03:27:12 pm »
When I bought a frame set from her, the pro-forma invoice, strangely, seemed to have underestimated the value of the goods.  Must have been a typo.............

Re: Hard shell seat recommendations
« Reply #9 on: January 25, 2020, 08:05:36 am »
As the creator of the hard shell PDQ, I didn’t keep it like that - it pushed the centre of gravity too far over the front wheel and made the steering very heavy, and I needed the boom out to its furtherest extension to allow it to work for even my short legs.  I reverted back to the hammock seat (which is otherwise very comfortable) and trimmed a bit off the front to allow an easier reach to the ground.

The PDQ has a very short wheelbase (it was less than that of a Brompton). For that reason I think it’s better suited to more upright seat designs than reclined, a longer wheelbase design is more accommodating of seat angle changes. The seat suspension seemed to me to be a critical part of the bike design and took the edge of the potential shocks a SWB design can pass up from potholes etc.

Re: Hard shell seat recommendations
« Reply #10 on: January 25, 2020, 10:22:04 am »


As the creator of the hard shell PDQ

Hello @Bentback ! I'm surprised I haven't worn your web page post out! I've taken loads of inspiration from that and it's given me so many ideas.

I noted the comments you made about the CoG being pushed forward and I'm working on a design for the front seat mount to allow the seat to be moved further back. The use of hydraulic pipe clamps is a great idea! I'm looking to see if I can get some of the rubber bits moulded in a lower durometer softer rubber for a bit of give and have some really soft anti vibration mounts for the back so I'm hoping this will take the majority of the hits out. While the donut looks like it did/does an amazing job I want to take it out of the equation and put a linkage on the rear mount to give a little suspension but also to allow the seat angle to be changed easily.

I've had about 3 years riding a rigid bent trike on 100psi tyres so have a tough idea of what to expect in terms of ride quality. If it's any better than that I'll be really happy.

I had a look for the seat supplier you mentioned but cannot find them. Really cheeky question; have you still got the seat and is it being used??!!

Ned.

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Rebuilding a PDQ frame to restart my recumbent collection!