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tpenfield
Senior Member
·
From Cape Cod, MA - USA
Joined
Dec 10, 2016
Last seen
Today at 3:03 PM
Messages
603
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tpenfield
replied to the thread
Twin I/O to Twin Outboard Conversion Project
.
Quick Update . . . As the engines become more 'broken-in' I am seeing a sweet spot for fuel consumption. 3600 RPM, 31 mph, 1.4 mpg...
Aug 26, 2026
tpenfield
replied to the thread
Re-design of 8 Foot Dinghy . . .
.
Yes . . . The cockpit floor sits above the static water line, so there is a scupper built into the aft portion of the hull (which you...
Aug 19, 2026
tpenfield
reacted to
fallguy's post
in the thread
Re-design of 8 Foot Dinghy . . .
with
Like
.
Can you dm me your email? I have something I can share, but not publicly. I will explain privately.
Aug 19, 2026
tpenfield
posted the thread
Re-design of 8 Foot Dinghy . . .
in
Boat Design
.
Greetings, As mentioned in another design/build thread I am planning on re-making my 8-foot pram dinghy (fiberglass over foam...
Aug 18, 2026
tpenfield
replied to the thread
Small speed boat mold construction
.
This thread has got me thinking that I need to make a new dinghy, because after 15 years or so the one I made has seen better days. It...
Aug 14, 2026
tpenfield
replied to the thread
Small speed boat mold construction
.
There has been little response from the OP regarding the input and comments so far. I did enjoy reading @ondarvr 's background, as I...
Aug 14, 2026
tpenfield
replied to the thread
Small speed boat mold construction
.
Perhaps @Admin can combine the 2 threads, since they are the same topic. Hopefully, @Chopperr007 will reply and speak for himself now...
Aug 13, 2026
tpenfield
replied to the thread
Small speed boat mold construction
.
I built an 8' boat . . . it is basically a pram dinghy . . . fiberglass over foam core. I didn't know enough at the time, so it...
Aug 12, 2026
tpenfield
replied to the thread
Twin I/O to Twin Outboard Conversion Project
.
I was pretty much on a schedule crunch getting the boat ready for the season, so I did not put too much effort into measuring the engine...
Aug 8, 2026
tpenfield
replied to the thread
Twin I/O to Twin Outboard Conversion Project
.
FWIW - I am seeing more and more outboard brackets done as hull extensions. It might be a trend :p
Aug 4, 2026
tpenfield
replied to the thread
Twin I/O to Twin Outboard Conversion Project
.
Thanks for the picture edit . . . :cool: It looks like I can accommodate a 2-bolt-hole upward adjustment, which would be 1.5". The...
Aug 3, 2026
tpenfield
replied to the thread
Twin I/O to Twin Outboard Conversion Project
.
Quick Update . . . With a good amount of up trim, I got 50 mph @5300 RPM. So, that hints at the engine height being too low. I hooked...
Aug 3, 2026
tpenfield
replied to the thread
Twin I/O to Twin Outboard Conversion Project
.
Here is a graph that might be interesting . . . I looked up the BoatTest data on the 'standard' CY338 Outboard version that came out in...
Jul 29, 2026
tpenfield
replied to the thread
Twin I/O to Twin Outboard Conversion Project
.
A couple more pics of the wiring/rigging in the (former) engine bay . . . I still need to install some level flooring and arrange some...
Jul 29, 2026
tpenfield
replied to the thread
Twin I/O to Twin Outboard Conversion Project
.
Thanks for your kind words, I have enjoyed sharing this project and I hope it will benefit others doing similar projects. Here are a...
Jul 28, 2026
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