Dumas Hot Shot Sprint 3.5 Tunnel Hull Build
#1
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Dumas Hot Shot Sprint 3.5 Tunnel Hull Build
I'm fixing to start building the Dumas Hot Shot Sprint 3.5 Tunnel Hull. This will not be a fast build as I only have time on weekends to work on the boat. I will be tracking my progress and posting pics as well. Any hints and tips will be well appreciated.
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RE: Dumas Hot Shot Sprint 3.5 Tunnel Hull Build
ORIGINAL: mgcrimson
I'm fixing to start building the Dumas Hot Shot Sprint 3.5 Tunnel Hull. This will not be a fast build as I only have time on weekends to work on the boat. I will be tracking my progress and posting pics as well. Any hints and tips will be well appreciated.
I'm fixing to start building the Dumas Hot Shot Sprint 3.5 Tunnel Hull. This will not be a fast build as I only have time on weekends to work on the boat. I will be tracking my progress and posting pics as well. Any hints and tips will be well appreciated.
enjoy the building[sm=thumbup.gif]
ww
#3
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RE: Dumas Hot Shot Sprint 3.5 Tunnel Hull Build
The 1st boat I ever built was the Dumas Hot Shot Sprint 7.5 which was over 10 years ago. I had started theABS hot shot 3.5 but never finished it. I used a paint scheme very similar to the one that Maus showcased on one of their sport hydros. I got into racing rc cars and ended up trading themfor some car stuff. I new one of these days I would regret itand man do I ever. Still know the guy that has the 3.5 and i'm in the process of trying to get it back.
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Curby76 (08-30-2021)
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RE: Dumas Hot Shot Sprint 3.5 Tunnel Hull Build
I sold off all my RC some time back (SLOWLY am getting going again) and the dumas 3.5 I was modifying went before I totally finished it up, plugged off the back section dropped the front (radio box) section way down, and mounted a VS1 cowling on it, still had some stuff I was going to do to it BUT sold so didnt, here are some pics of where it was. also cut the cowling down so it wasnt as tall off the deck
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RE: Dumas Hot Shot Sprint 3.5 Tunnel Hull Build
The one I'm building now isthe wood kit. The black 7.5 that I built several years ago was wooden also. The red 3.5 was ABS.
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RE: Dumas Hot Shot Sprint 3.5 Tunnel Hull Build
My last wood Sprint build was done WOF style. Once the main frame has been glued up, glue in foam within all the open spaces: (spoons and center section). Sand down the foam and then start to lay down the sheeting. For gluing the foam to wood / wood to foam, use Gorilla glue. Stuff will "foam" up and fill in all the gaps. The plus side to this is that the harden glue is easy to sand, unlike epoxy. This process will speed up the build since all those 1/4" stringers won't need to be glued in.
#8
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RE: Dumas Hot Shot Sprint 3.5 Tunnel Hull Build
So far I've assembled the jig, glued the hull framework to the tunnel top, installed the transom doubler and sponson points.
#10
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RE: Dumas Hot Shot Sprint 3.5 Tunnel Hull Build
Got the stringers glued in. Next I will start to skin the hull. So far no problems with the build. Simple and straight forward.
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RE: Dumas Hot Shot Sprint 3.5 Tunnel Hull Build
Got the bottom of the hull sheeted. I left a small overhang on the rear of the sponson bottom. Next is laying the seeting down on the top of the sponsons.
#13
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RE: Dumas Hot Shot Sprint 3.5 Tunnel Hull Build
Forgot all about that. Thanks for reminding me.Havn't done anything to it yet so I'll try to get it sealed this weekend before the top sheeting goes down.
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RE: Dumas Hot Shot Sprint 3.5 Tunnel Hull Build
ORIGINAL: Jerry Dunlap
I recommend coating the interior of the hull with epoxy prior to attaching the top sheeting.
JD
I recommend coating the interior of the hull with epoxy prior to attaching the top sheeting.
JD
Hi Jerry, I am building the Hot Shot 7.5 at present. Would layering the inside of the sponsons with resin affect the flexibility of the hull? It wouldnt be prone to cracking at all?
P.S nice build thread here too...I've subcribed ;-)
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RE: Dumas Hot Shot Sprint 3.5 Tunnel Hull Build
ORIGINAL: AussieOutboard
Hi Jerry, I am building the Hot Shot 7.5 at present. Would layering the inside of the sponsons with resin affect the flexibility of the hull? It wouldnt be prone to cracking at all?
P.S nice build thread here too...I've subcribed ;-)
ORIGINAL: Jerry Dunlap
I recommend coating the interior of the hull with epoxy prior to attaching the top sheeting.
JD
I recommend coating the interior of the hull with epoxy prior to attaching the top sheeting.
JD
Hi Jerry, I am building the Hot Shot 7.5 at present. Would layering the inside of the sponsons with resin affect the flexibility of the hull? It wouldnt be prone to cracking at all?
P.S nice build thread here too...I've subcribed ;-)
JD
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RE: Dumas Hot Shot Sprint 3.5 Tunnel Hull Build
ORIGINAL: Jerry Dunlap
When I coat the interior of a wood hull, I use a heat gun to thin the epoxy/fiberglass resin. Then brush the thinned material. Your don't need a heavy coating to seal the wood. Hull flexibility really isn't an issue. Thinned material shouldn't crack.
JD
ORIGINAL: AussieOutboard
Hi Jerry, I am building the Hot Shot 7.5 at present. Would layering the inside of the sponsons with resin affect the flexibility of the hull? It wouldnt be prone to cracking at all?
P.S nice build thread here too...I've subcribed ;-)
ORIGINAL: Jerry Dunlap
I recommend coating the interior of the hull with epoxy prior to attaching the top sheeting.
JD
I recommend coating the interior of the hull with epoxy prior to attaching the top sheeting.
JD
Hi Jerry, I am building the Hot Shot 7.5 at present. Would layering the inside of the sponsons with resin affect the flexibility of the hull? It wouldnt be prone to cracking at all?
P.S nice build thread here too...I've subcribed ;-)
JD
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RE: Dumas Hot Shot Sprint 3.5 Tunnel Hull Build
Jerry,
How did you coat the exterior of the tunnel you built for Rod? Was than just 2 coats of epoxy applied as you describe or did you use and auto clear coat. The finish was fantastic.
How did you coat the exterior of the tunnel you built for Rod? Was than just 2 coats of epoxy applied as you describe or did you use and auto clear coat. The finish was fantastic.
#18
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RE: Dumas Hot Shot Sprint 3.5 Tunnel Hull Build
How do you feel about adding alcohol to thin the epoxy. I've done this with another boat that I built a long time ago to seal it with epoxy.
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RE: Dumas Hot Shot Sprint 3.5 Tunnel Hull Build
ORIGINAL: TCHedOff
Jerry,
How did you coat the exterior of the tunnel you built for Rod? Was than just 2 coats of epoxy applied as you describe or did you use and auto clear coat. The finish was fantastic.
Jerry,
How did you coat the exterior of the tunnel you built for Rod? Was than just 2 coats of epoxy applied as you describe or did you use and auto clear coat. The finish was fantastic.
JD
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RE: Dumas Hot Shot Sprint 3.5 Tunnel Hull Build
ORIGINAL: mgcrimson
How do you feel about adding alcohol to thin the epoxy. I've done this with another boat that I built a long time ago to seal it with epoxy.
How do you feel about adding alcohol to thin the epoxy. I've done this with another boat that I built a long time ago to seal it with epoxy.
JD
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RE: Dumas Hot Shot Sprint 3.5 Tunnel Hull Build
Ill agree with jerry on the heat and HJ on what he said, I dont add anything to thin my epoxies heat and or buy the correct epoxy
#24
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RE: Dumas Hot Shot Sprint 3.5 Tunnel Hull Build
I know its been a while but I finally got the hull skinned. I will be sealing the hull soon and then will start adding the hardware. Stay tuned!