Scotts E-thundercat build

[m4a1usr]

I also have been browsing the nitro TC threads over at RCU and a lot of guys running bigger nitro motors in their TC's are actually forcing the strut down below the sponsons and giving the strut posotive angle. Does this sound right. Maybe having something to do with the gas tank mounted in front of the motor/compensating for the forward center of gravity??

I have heard that as well. Its one of the reasons I never bothered to modify the flex tube to allow for the strut to come up further. I would think that with the strut below the sponsons it would make the hull run nose heavy(wet) even if the COB was set in a normal rearward location. I'm going to stick with mine up an 1/8" for the time being. But my boat does have power to spare.

John

[peells]

I would have had to stuff twins in that rig just cause it would really make that kitty purrrrrrr

[forescott]

I received my new rudder assembly from ose last week and had to order a longer linkage to make it work. Also got my m445 & m545 from eggneg today. (Very nice!!)
So I'm gonna run it again tomorrow and get some temperature and gps readings on the 445.
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[lomdel]

Lookin' good!! Now get her wet!

[forescott]

O.K. Ran it today after work and got 47.6mph on my garmin gps. Octura m445, strut is approx. 3/8" above sponsons and c.o.g. is 29%. Motor was 87 degrees. Still getting water in through the stuffing tube. I have a piece of fuel tubing over the tube/flex shaft that I thought was snug, but maybe not snug enough. I'm gonna tighten up the zip tie a little, and try the m545 tomorrow.

[peells]

You have a short stuffing tube don't you? I think if you use tubing over the stuffing tube and the flex the tubing will melt to the flex shaft, I did that once and it actually made my boat slower, you might consider a auto bailer.

[forescott]

[QUOTE=peells;171659]You have a short stuffing tube don't you? I think if you use tubing over the stuffing tube and the flex the tubing will melt to the flex shaft, I did that once and it actually made my boat slower, you might consider a auto bailer.[/QUOTEI
I really need to keep the water out. Not so much worried about the amount of water in the hull at the end of my runs, but that it gets flung all over the batteries and speed control by the motor collet.

[forescott]

Ran it again today with the same setup and m545. Got 49mph on gps. It seems to still be running a little wet. Not sure if I should give it a little posotive trim on the strut or try to move the batteries back more.

[m4a1usr]

I really need to keep the water out.

One of the old tricks is to put a sponge wedged right under the end of the stuffing tube. You can trim it to fit or even put a series of them if the water entry is bad.

John

[ozzie-crawl]

Ran it again today with the same setup and m545. Got 49mph on gps. It seems to still be running a little wet. Not sure if I should give it a little posotive trim on the strut or try to move the batteries back more.

i would try about 1 deg positive on the strut, i know different hulls need different setup but i run a bit of positive on my cat gives it that nice nose up attitude

[forescott]

Still working on the water issues, but got 50.8 mph on gps today! Goal reached!! Oh yeah, motor was 84 degrees. Time for a video.

[forescott]

Been trying to fix the water coming in from the stuffing tube and found out that a 7/32" brass tube will slide into my teflon tubing for my huey 3/16" flex cable. (with a little effort and some grease of course) The 7/32" brass tube makes the teflon swell up a little and the 3/16" flex shaft fits real snug in the 7/32" brass tube. So I shoved the whole enchilada into the stock stuffing tube with a lot of grim racer grease(sticky stuff!) I am gonna run the boat again tomorrow with a little posotive strut angle, and hopefully no more leaky, leaky!! Wish me luck!!

[forescott]

Well, I wasnt able to tell if any water came up from the stuffing tube today because I rolled the tc and it immediately filled with water and began to sink. I had to swim for it! It would have been fine but the flimsy plastic canopy split longways down the center. Amazingly enough I think all components survived(except my cell phone that was in my pocket) I blew everything out with compressed air and took the end cap off of the castle motor, removed the innards and blew it out as well. I wonder if I could re-inforce a new canopy with some type of fiber cloth and resin to give it some strength? My gps survived and still recorded the run with 51.8mph top speed. I think the strut had too much posotive angle. It was running a little too free for my taste. New canopy on the way, and Ill get it put back together.

[m4a1usr]

What a bummer! The hatch is rather large and flimsy. When you get the new one you can attach a layer of cloth. I did the cover to my Maus and they are made similar. Have you filled the nose with foam? There is a wooden bulkhead that isolates the forward part of the hull but the holes at the bottom allow you to fill it with spray foam. Just use the non expanding and fill it in stages. And with the hull leaning up against something so that it remains vertical thru out the drying process.

Did you hit something to flip it? Running to loose in a turn? Your speeds are right where I am at now. Plenty enough fast for me. At least for now.

John

[forescott]

What a bummer! The hatch is rather large and flimsy. When you get the new one you can attach a layer of cloth. I did the cover to my Maus and they are made similar. Have you filled the nose with foam? There is a wooden bulkhead that isolates the forward part of the hull but the holes at the bottom allow you to fill it with spray foam. Just use the non expanding and fill it in stages. And with the hull leaning up against something so that it remains vertical thru out the drying process.

Did you hit something to flip it? Running to loose in a turn? Your speeds are right where I am at now. Plenty enough fast for me. At least for now.

John

Too loose in a turn i think. I',m still getting used to the handling characteristics of this hull. There is still plenty of room to"prop-up" but I think 50mph is a good speed for this hull and I'm just gonna leave it alone. The only reason why I have'nt added any foam is because I don't want to throw off the c.o.g. My batteries are already pretty far back. When it went under it just turned nose-up and the trapped air in the bow kept it afloat. Do you think sealing up the holes in the bulkhead and maybe adding some more epoxy around the perimeter of the bulkhead would be sufficient to create a sealed cavity of air to keep it afloat??