Another Insane FE30 - Rick's

[ezhitz]

A question. The directions for the turn fin say to attach it on the inside of the bracket. It seems intuitive to attach it on the outside as pictured. How much of a difference does it make?

My take on this is when you go into the turn the fin pushes against the bracket for more support while mounted on the outside it could bend because the only support is the screw head and washer.

[properchopper]

When a three-point hydro turns, there's a huge cascade of water streaming up the inside of the fin. If it contacts the bracket, (if it was on the inside) it would induce a small amount of lift and contribute to the inside sponson's possible tendency (dependent on the fin's dynamics) to raise up and upset the balance in the turn. This is straight from Jeff Michaud. Mr. ehitz's observation is also well taken

A pair of FE30's on the bench ready to ship to happy customers

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[Brushless55]

Two part, 2lb density, foam in the sponsons. Each sponson was a 45g pour.
[ATTACH=CONFIG]112128[/ATTACH][ATTACH=CONFIG]112129[/ATTACH]

All cleaned up and ready to be covered with CF cloth.
[ATTACH=CONFIG]112130[/ATTACH][ATTACH=CONFIG]112131[/ATTACH]

Now did you fill in the whole cavity of the sponsons?
I've thought of doing this for extra strength

I don't think so. From my research of all the builds on this site, no one has mentioned it. I asked Tony about the CoG and no mention either. His advice was "place the motor so the CG is at the tip of the fin - or where the tub heads to the sponsons".

and is this placement for PSport or PLimited ?
thanks

[rickwess]

My take on this is when you go into the turn the fin pushes against the bracket for more support while mounted on the outside it could bend because the only support is the screw head and washer.

When a three-point hydro turns, there's a huge cascade of water streaming up the inside of the fin. If it contacts the bracket, (if it was on the inside) it would induce a small amount of lift and contribute to the inside sponson's possible tendency (dependent on the fin's dynamics) to raise up and upset the balance in the turn. This is straight from Jeff Michaud. Mr. ehitz's observation is also well taken

A pair of FE30's on the bench ready to ship to happy customers

[ATTACH=CONFIG]112148[/ATTACH]

I can't see the fin bending. I'm sure there would be other points of failure well before the fin gave way.

Interesting about the extra lift from the water pushing up on the bracket. I'm sure it exists, but I wonder how much it's noticeable. I guess that's what testing is all about.

Nice looking hydros Tony. I did not appreciate the challenge of the 4s2p layout of the FE30 until I had the hull in person. The opening looks huge in pictures, but the width is the limiting dimension. I'll start laying the internals out soon and post some pics for comments.

[rickwess]

Now did you fill in the whole cavity of the sponsons?
I've thought of doing this for extra strength



and is this placement for PSport or PLimited ?
thanks

Yes the entire cavity was filled with 2 part foam. The sponsons on the FE30 are plenty strong. Especially with the CF inlay throughout the bottom. I like foaming the "empty space" purely from a flotation perspective. Of course the bulkheads and the CF covering is just for aesthetics.

I'll also foam the hatch and cover it with s-glass once I know how much space I need to leave for the motor. There are huge cavities in the hatch so there will be little risk of ever losing it.

I don't know if the CoG is different for PSport or PLimited. Tony knows this boat best and knew what I was planning PSport when he provided the advice.

[Brushless55]

Yes the entire cavity was filled with 2 part foam. The sponsons on the FE30 are plenty strong. Especially with the CF inlay throughout the bottom. I like foaming the "empty space" purely from a flotation perspective. Of course the bulkheads and the CF covering is just for aesthetics.

I'll also foam the hatch and cover it with s-glass once I know how much space I need to leave for the motor. There are huge cavities in the hatch so there will be little risk of ever losing it.

I don't know if the CoG is different for PSport or PLimited. Tony knows this boat best and knew what I was planning PSport when he provided the advice.

Great info, thanks
I need to get some of that 2 part foam

[properchopper]

It's your boat; do it up however you think is correct. As far as testing is concerned, the hull was designed, tested, re-done until it was just right before its release. If you "can't see" or "wonder" about how things are done the way they are it's all good - again it's your project ; only, those that are tagging along should consider the validity of your comments versus

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And if that sounds a little strong, I'll stand by it having a hand in its design, testing, rollout, racing and setting records with it, and having built well over two dozen FE30's for satisfied customers worldwide.

[rickwess]

Yes your last post was out of line. Forgive me for posting saying that I would test to see if I noticed a difference.

[Brushless55]

It's your boat; do it up however you think is correct. As far as testing is concerned, the hull was designed, tested, re-done until it was just right before its release. If you "can't see" or "wonder" about how things are done the way they are it's all good - again it's your project ; only, those that are tagging along should consider the validity of your comments versus

[ATTACH=CONFIG]112155[/ATTACH]

And if that sounds a little strong, I'll stand by it having a hand in its design, testing, rollout, racing and setting records with it, and having built well over two dozen FE30's for satisfied customers worldwide.

Uhhh

[Fella1340]

This has turned into one strange thread. WTH?

[Scott T]

Nice work on the sponson foam Rick Getting flotation into a glass hydro is never much fun. Looks like you're building a nice reliable boat, keep up the good work.

[CHIEFY_44]

ok guys I have two of these boats both built by tony, I have one spec rig and one sport rig, both run great, fast and reliable, tony knows this boat inside wrong way round and the boats designer and hull builder jeff is one of the best in the business.
these boat are strong as hell I have personally have raced both of these boats against some of the best in USA, both me and tony have raced these boats for 3 yrs now and none have anything else done to them since building, no foam added not needed, carbonfiber floor not needed, turn fin mounting anything more than stock you could have a problem if you hit something in the water, I will give into one thing we both put nylon bolts trough the fin to mount it to the bracket we found out the hard way I hit tony's boat at full speed and messed his hull up with 2 metal bolts in the fin. Credit to how stong these boats are with some quick fixes to seal the hull we both finished the days racing, and this accident happens regularly between me and tony as we both push each other hard. the turnfin needs to go where tony says it does generate lift and enough to upset the handling of the boat in corners, I know I put it on wrong once and had to go rescue it.
Guys if you want a strong reliable race/sport boat listen to what tony says about this boat, HE KNOWS IS *!***!***!***!**. We both have done lots of testing to get our boats running fast and clean.

[rickwess]

Who cares? Jeff was kind enough to build the boat the way I asked him to. Yes he forgot about the aluminum backing plate, but I know he had more important things on his mind. No big deal, I got by.

What I take exception with is the attitude there is only one way to build a boat and if you don't build the "proper" way, then you are wrong and are under attack.

This is my second Insane boat, and I love then. I do regret buying them though because I have to deal with the SoCal peanut gallery.

[Brushless55]

Nice work on the sponson foam Rick Getting flotation into a glass hydro is never much fun. Looks like you're building a nice reliable boat, keep up the good work.

I agree Rick is doing a great job!

Who cares? Jeff was kind enough to build the boat the way I asked him to. Yes he forgot about the aluminum backing plate, but I know he had more important things on his mind. No big deal, I got by.

What I take exception with is the attitude there is only one way to build a boat and if you don't build the "proper" way, then you are wrong and are under attack.

This is my second Insane boat, and I love then. I do regret buying them though and having to deal with the SoCal peanut gallery.

Nothing at all wrong with changing things up!
Keep going bro
just ask Mike with ML boatworks he loves when we can change up what he builds and make em faster!!

there is never just one way to build em

[Fella1340]

All I read here is someone wanting to build a boat the way they want to. It's no different from any other boat including HPR's and MHZ's that people customize to their liking. Doing an inlay, adding foam and mounting a bracket to your liking is all apart of the build, that's it. What's wrong with building a boat the way you want to?