XF20 tunnel 3” radius fillet

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Matthew Anderson
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XF20 tunnel 3” radius fillet

Post by Matthew Anderson »

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I’m ready to fillet the inside of the tunnel. Jacques calls for 3” wood flour epoxy mixture. I plan on using the 6” S & D pipe I quartered for a fillet tool.

I’m thinking I need to do this in two passes, possibly with say a 4” pipe quartered first? That’s a lot of wood flour.

I’m planning on wrapping 12oz biax tape around a 6” pipe with epoxy to make a tube, quartering it and setting the 1/4 glass tube in the wood flour.
Last edited by Matthew Anderson on Tue May 11, 2021 11:05 pm, edited 1 time in total.

TomW1
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Re: XF20 tunnel 3” radius fillet

Post by TomW1 »

It would be better if you could use PVC pipe the walls are thinner. But yes you will be using a lot of wood flour/epoxy.

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Matthew Anderson
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Re: XF20 tunnel 3” radius fillet

Post by Matthew Anderson »

S & D is thin walled pvc pipe for sewer and drain.

fallguy1000
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Re: XF20 tunnel 3” radius fillet

Post by fallguy1000 »

NO!

Good way to start a fire.

A 3" radius filled is 1.25" of thickened material at the deep spot and can catch fire.
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fallguy1000
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Re: XF20 tunnel 3” radius fillet

Post by fallguy1000 »

I generally never like more than 1/2" thick fillets, so make a one inch radius fillet then a two inch, then a 3". You can work on green epoxy if you are careful with the cleanups. Then about 2 hours between fills so they don't get super hot..

The inch one can be done with a big washer.

The two inch can be anything close..etc.

two passes would be allowable as well I suppose
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Matthew Anderson
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Re: XF20 tunnel 3” radius fillet

Post by Matthew Anderson »

Well this is two layers from today. A total of 12 oz of epoxy with 2 cups of wood flour. It’s up to an 1 3/4” radius. About halfway there. I’ll just be patient and go wet on green until I get to the 3” radius.
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Just have to keep it clean.

Matthew Anderson
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Re: XF20 tunnel 3” radius fillet

Post by Matthew Anderson »

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Another 33oz of epoxy and right at 1# of wood flour total. I laid in a piece of 12 oz biax tape and finished the fillet with quartered 4” pipe for a two in radius. One more to go. I’ll hit it while it’s still green tomorrow.

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Re: XF20 tunnel 3” radius fillet

Post by jacquesmm »

It looks very clean. Keep posting pictures.
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Matthew Anderson
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Re: XF20 tunnel 3” radius fillet

Post by Matthew Anderson »

Another 32oz of epoxy and a 1/2# of wood flour. One side is complete at a 3” radius. I laid a layer of 12 oz biax tape. The other side was built up about another 1/2”. I’ll finish it out tomorrow morning.
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Build on!

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Re: XF20 tunnel 3” radius fillet

Post by Matthew Anderson »

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Another 24oz of epoxy and a total of 2# of wood flour. It wasn’t as difficult as I feared. Stay patient, be thorough, organized and clean. Turned out pretty good. I will say that was glad to have experience with one boat build before taking this on.

I’m going to jack up from below, glue and tab the tunnel into place tomorrow.

Build on!

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