rageman

It helps a lot. I should never do math in my head.

Is there a detontation versus altitude versus shuish band versus %nitro calculator or table available that can be used to evaluate that of which you speak? One location I would run is at 915 feet above sea level.

motoren

Why cant I get my TC to fly well. When I trim the bow up it is slow, if I trim it down the boat is screams but does not plane like some others I have seen. The boat planes the same way with and into the wind. The flexshaft seems to be free up or down but could that be eating power? Is the prop driving the stern down when the bow is trimed up?

Hesco Racing

Rageman

Check out http://rcboat.com/cr.htm to compare what i wrote above. My advise has come from being involved with model boating for 18 years.

gooycheese

Ok Hesco Racing now I am lost. According to the link you just posted the Dynamite .32 head clearance should be .010 or less . This is a general quote from that article :


" For a modern .21 engine .006-.007", for a .45 .009-.011", for a .67 .010-.013, for a .80/.90 .012-.014". "

So based on the .015 clearance thats more than the clearance for a IMPBA F class engine?


Paul

Hesco Racing

Hold on guys

You are missing the point. I never said you can not run a tighter squish band. When I measured my motor I found that I can without running shim achieve a 0.015" squish. Taking in consideration that I am not intending farting around with barometers and air density measuring tools that squish band gives the max performance for the 40% Nitro fuel we are running. And you can achieve this without machining the head button. I have run on .21 0.006" squish and the motor becomes "finiqu" on tuning. Even so much as a bit of cloud cover chainges the settings. Run a tighter squish but check the piston after you do a plug run and make sure it is not detonating.

I hope I have not confused everyone.

rageman

Hesco Racing,

I get it.

rageman

Hesco Racing,

So your .32 Dynamite with all shims removed and no machining produced 0.015" squish band out of the box and mine (based on my measurements which may not be perfect) is 0.0115" with all shims removed. Am I understanding you correctly?

If that is the case was it just dumb luck that you stumbled on to the perfect 0.015" squish band..........or did you take that default 0.015" squish band and determined that to get the max HP out of the Dynamite .32 with a 0.015" squish band you arrived at the value of 40% nitro from trial and error and experience/engine design software/other?

Hesco Racing

Rageman

Yes

Yes we tested 60% Nitro but found the motor did not have significant speed increase for the money spent. Remember we race these boat in our club racing and at the end of the day you need to finisha race to take the win. Its not always speed that takes the race but drivable performance.

rageman

Sorry to still pursue but your "Yes" to my multiple theories on how you came to the 0.015" quench leaves me in doubt. I think what I am understanding is that your Dynamite .32 had a default squish band of 0.015" with the shims out and you tried 1.) 40% nitro and 2.) 60% nitro and the 40% nitro ran the best, end of trial and error testing period, correct?

rageman

This is what was posted on the web site noted below about initial motor break in. Very different from what I have read on this site particullarly with regard to running without water during breakin.
Comments?

"After you have the engine back in your model, it is time to break in the engine. A Boater/Engine Builder (Steve O'Donnell), who I respect a great deal told me some time ago about his break-in procedure. I have been using a variation of it with VERY good results. I remove the water line from the rudder assembly and make sure that I have the needle set on the rich side of perfect. I use a mixture control, so that is easy. For those of you who don't have a mixture control, get to the rich side of a perfect needle. I launch the boat and run around the course, giving the engine full throttle for at least 1/2 of the straightaway and then reducing the throttle to half in the turn (allowing the mixture to richen), then full on 1/2 of the SAW, then reducing to 1/2 in the turn. This "Heat Cycles" the engine and the liner/piston fit will be terrific. I usually run 4-5 tankfuls of fuel through the engine before I ask the engine to "do its thing". DO NOT run the engine very cold, with the water line connected, as it will not break in at all. You MUST heat cycle the engine to break it in!"

Vamp

Well of to the shop it goes. I got my TC back an it would start but then it shuts off. I have tryied every thing now I can't get it working. GRRRRRRRR this really suxs. Guys plese cross ur fingers that things come threw. I thought this would be a kool hoby for me now I am back from the gulf war, an get me out of the house being a 100% disable vet. It is so upsetting that I can get it to run. as soon as I can look out Oklahoma water.

wave waker

sad to hear that[],,but just don't be get so dissapointed, let me tell u, when i got my first nitro boat it took me 1 month to be able to run it, from now and then i still get boat problem.

i do no how technically/mechanically inclined u are but u'll figure it out,,,yup, it's a very kool hobby, same with tc31, after i worked the bugs out, this is one of my favorite boat in my fleet...more goodluck to you.

Vamp

Well I got it running an got it in the water 30 secs in to it an I saw that the water was not sucking in to the eng. an then the unthinkable happen the throttle pice on the cab broke. GRRRR man this suxs. I am just going to to send the boat off an see if they will fix it. suxs I got to wait 8 more days. You would think someone that worked on real helicopters would not have so miny probs lol. Talk to u all soon

Sloanhaus

How did the new servos work, I have added the inline rudder to my TC31 and now have crappy turning power.

jmshark

1 Month to run, my first boat (nitro) i burn the engine in 12 tanks [&:] but i still really think the engine has a defect i put an os after and no more trouble.

buy the way Some Prop i m running with my thundercat 31
x437/3 Blade
x440
x440/3 Blade
m440
x640
X642

yolanda

hi jmshark. which prop did you find best overall. the x654 work well for me. give it a go with a prather 225 stainless. both run well on 40% nitro.

gooycheese

I have been using an m445. jmshark all those props u listed are a little small aren't they? Although next weekend I will be changing engine out since I put the connecting rod thru the case, I will be trying a K&B .21. The reason I am using this engine is this boat is just for fun boat that I run with friends, and it is suppose to have actually a little more power than the stock engine. Also I am getting 2 of them used for $100 so it sounded like a good deal, we will see


Paul

jmshark

FOR A GOOD SPEED I LIKE MY 2 PROP WITH 3 BLADE ALSO MY M 440 IS REALLY GOOD I PUT THIS ONE DEEP IN THE WATER I NEVER TRY THE M 445. IF YOU ARE LOOKING FOR A GOOD ONE TRY ON OF THE 3 BLADE YOU WONT BE DISAPOINTED.
And yes you did a really good deal on K&B I saw only outboard and they work great. If i need to change my dynamite it will buy O.S. .21 VZ-M Marine or a Rossi 2.1

jmshark

I M PRETTY SURE ONE OF MY 3 BLADES WILL MOVE THE WATER LIKE YOUR M 445, SURE THEY ARE LITTLE BUT MY ENGINE IS SCREAMING WITH THIS 3 BLADES SO I DON T KNOW I WILL GIVE A TRY.

gooycheese

The OS is a good engine the Rossi is a higher end engine and I don't see it being justified putting that in this boat. When my boat was running its best with an m445 prop I was hitting 42mph, if you have a way to check speed I would be curious to know how fast your props are pushing you? Also like has been said there is more than 1 way to skin a cat and your way could be just as good as the way I do it if not even better.


Paul

jmshark

I DON T KNOW MY SPEED I need to buy a gun radar from toys r us for 29$ i know someone who has good one but know it s the summer i m in arizona so he wont come offen but i will try to give you a speed i suppose i m doing a little less then 42 i m not sure. I WANT TO DO ALL PROP LIKE THAT AND SEE WICH ONE IS REALLY GOOD. I m OREDERING A M 445 BUY THE WAY

SmattaHead

Hey Guys!

Well, I broke down and ordered a TC31 as my first boat.

I tried to read this thread, but it's a monster!

Can anyone give me the list of immediate things I need to do to get my boat in solid running condition, as well as being prepared for the things that could go wrong on the water when I get it out there?

Thanks
SmattaHead

rageman

Paul,

Can you list the mods / setup on your TC that gives you 42 mph?

jmshark

I find something for prop again
On a website they say the best prop for the thundercat are this one
Y547 HOT ITEM
X646
X646/3

gooycheese

Only mods I have are:

Prop : m445
Tuned Pipe : OPS 3280
Carb : SuperTigre Carburetor S40K-S45K/G-51/GS-40/GS-45ABC


No Head shims, and exhaust pressure nipple moved to 1/2" in front of fat of the pipe.


Paul


I did blow this engine though and now I am going to try a K&B .21 , getting a good deal on 2 of them so we will see how they work.


Sorry these pics of the connecting rod thru the case arent the best.