Fightercat CF Cheetah Big Single build ~

[jj2003]

I mean no offense to jj, it may work for you and that's great. I already know how go "make" it work but it's too much crap to deal with and chance in my opinion. I don't feel like spending days on getting the foam correct in my hulls. I'm starting on a new build tonight and I have plenty of kintec foam. It just works.....and no drama with it. When the outside is cured, so is the inside. On the spray can stuff, it air cures. The middle that get little to no air takes a long time to cure. I've cut open the kintec foam and because it's a chemical cure, it was cured throughout. I guess I'd rather back safe than sorry. Like I said, no offense or anything meant....I'm just trying to keep anyone from messing up their hull. It may work for you because you may know how to mess with it, but just spraying it out the can and into your hull will result in some undesired effects if you don't know what your doing.

No offense taken. I understand! :) Were cool!

[kfxguy]

I can understand you pain kfxguy. I have seen both sides to it as well. And to each his own opinion. The 2 part system acts the same way when to much is applied at once. It needs air to cure and room to expand(even if it is low expansion rate). I know there are experienced boat builders on here as well who don't like the unprofessional approach to it but if used correctly it work's out fine. Some dont believe in it at all and strictly rely on pool noodles. If you were to take a survey, many would say they had the same experience and would never do it again, but some would also approach it's application differently as well, trying to get it to work properly, especially if your on a budget. Sure the 2 part system is nice and you can control the expansion rate as well. They also make different types of foam too. Some have different lb density ratings as well as chemical make-up. But you have to remember do not flood the entire compartment with the mix and be sure to apply in layers as to allow for air to cure the mix. If there is no air, there is no cure.

mekzoid, Do what you feel most comfortable with and with recommendations as well and by no means take anyone's word that this is the "s**t". Even mine. All of our experiences are different and never exactly the same, and there is a learning curve. If that weren't the case, we would all have the same hull's going just as fast as the next guy. Good luck and looking forward to your experience!

I'm glad we are the same page :)

The stuff you speak of will work I agree....it's just not for someone who hasn't experimented a bit with it and know what to expect. The pour in stuff is much easier to get the hang of more quickly. Good deal, I'm glad I did start a war! Lol

[jj2003]

I'm glad we are the same page :) Good deal, I'm glad I did start a war! Lol

Nah.....no chance! In my eyes there's to much to learn about whats right and wrong and pass it on to our children in hopes that they have a fruitful life. And it's not worth the time or effort to start any pissing matches. We all learn what we know through our mistakes and if we can help out a fellow boater, so be it. Life is to short bud...We need more time to make friends rather than enemies!

[kfxguy]

Nah.....no chance! In my eyes there's to much to learn about whats right and wrong and pass it on to our children in hopes that they have a fruitful life. And it's not worth the time or effort to start any pissing matches. We all learn what we know through our mistakes and if we can help out a fellow boater, so be it. Life is to short bud...We need more time to make friends rather than enemies!

You are so very right! Cheers man!

[mekzoid]

Thanks for the responses guys. I wont be the linked foam, Thanks for the tip. I don't think Kintec ships that 2 part overseas but I will be sending an email to him tomorrow.

I am moving house as we speak just incase I need surgery, I need a more appropriate house. So progress will be slow but am really looking forward when it gets running.

[rickwess]

You may wish to contact that shop (Trojan) directly.

You want a 2 part polyurethane closed cell foam of 2lb density. This is what I use:

http://compositescanada.com/product-catalog/resins/product/305-pour-in-place-polyurethane-foam?search=foam

You should have 10-15 seconds to mix, then another 15-20 seconds to complete your pour before the reaction starts up. Experiment before you use on your boat so you're comfortable. 2 cans of foam (1 quart each) cost me ~C$35 and will be more than you will ever need in your boat building lifetime.

The expansion will not put undue stress on an area that is open on at least one side. Want proof? Take a piece of paper and form it into a cone and use a few pieces of tape to hold it in shape. Pour in the foam and see how the paper does not distort.

Also, temperature plays a large role in the finished product. If you want maximum buoyancy, mix the product at the recommended (or higher) temperature of 24C. The result will have larger air cells but be harder to sand smooth......if you want to form it. If you drop the products' temp to ~18C (my basement in the winter or a short time in a fridge), the foam becomes denser (smaller air cells) and it's much easier to form.

[kfxguy]

You may wish to contact that shop (Trojan) directly.

You want a 2 part polyurethane closed cell foam of 2lb density. This is what I use:

http://compositescanada.com/product-catalog/resins/product/305-pour-in-place-polyurethane-foam?search=foam

You should have 10-15 seconds to mix, then another 15-20 seconds to complete your pour before the reaction starts up. Experiment before you use on your boat so you're comfortable. 2 cans of foam (1 quart each) cost me ~C$35 and will be more than you will ever need in your boat building lifetime.

The expansion will not put undue stress on an area that is open on at least one side. Want proof? Take a piece of paper and form it into a cone and use a few pieces of tape to hold it in shape. Pour in the foam and see how the paper does not distort.

Also, temperature plays a large role in the finished product. If you want maximum buoyancy, mix the product at the recommended (or higher) temperature of 24C. The result will have larger air cells but be harder to sand smooth......if you want to form it. If you drop the products' temp to ~18C (my basement in the winter or a short time in a fridge), the foam becomes denser (smaller air cells) and it's much easier to form.

That's some good info....I'd take this guy's advice!

[kenrid]

Hello mekzoid, can you supply any info on what strut you are using and how deep the prop will be? I have a GRP version of this hull running a Neu 1515 on 5S and it runs too flat (nose heavy). I think I will need a deeper strut. Any info you can supply will be useful.

[flraptor07]

Your Cheetah build is looking awsome so far, I did a twin with TP 4060s 1450kv and it runs great! Here's a link to it and there's a video on post #21 http://forums.offshoreelectrics.com/...-Cheetah-Build
You will also want to do the hull mod to the rear ride pad, it makes a huge difference in the way the hull runs. PM me and I'll explain it to you or get with "Tiqueman" on the forum he's the one that came up with the mod.

[Bduncan]

what kinda speed you get out of that set up