Seaview

[greenman407]

Gentlemen................and I use the term ...........loosely. The next phase was to remove the two bladed empellers and install 4 bladed ones. These are nice bits Dave sent me. What a nice guy! They were, however, larger in diameter and the hub length also was longer, so a bit of backyard machine work was called for. At anyrate....they are going in as we speak. I hope to get a test in this weekend. Im looking for improved thrust numbers. This will tell me that(using the existing motors) the thrust numbers of previous, were limited by RPM capability of the motors@3 to 1 gear ratio and not solely dictated by the motors torque limitations. So the question will remain....Can these motors produce the thrust that I need at a reduced RPM, without overheating? At that point I will know whether or not to upgrade the motors or leave them as they are. Cheerio!

[greenman407]

And another thing. Im thinking seriously about removing the clear windows from the nose and leave the window ports open. It wont look as good but the water will be able to enter the nose without being deflected back out and its associated hydrodynamic drag penalty. What do you think?

[greenman407]

GUESS WHAT I GOT???!!! My two custom wind motors. Designed specifically for my Application. 27 turn, long shaft(1")super magnetized, extreme heat resistant, stand up heat resistant brushes.
However, it seems to me that if you run anything wide open for too long its going to get hot. My next step will be to use the existing Caswell 12 volt motors as they are and change the empellors to the 4 bladed ones. If I can generate some more speed then we can afford to chop the throttles and run at a lower throttle setting. Then we can see if we can keep the motors from overheating.http://www.teambrood.com/store/home.php Eddie does nice work and he keeps in touch during the process with continual updates.

[Peter W]

Mark, I know that my mate, the one building the NR-1 has a similar problem the scale props in the rear planes just aren't going to push it along. He came up with the idea of running a separate, discreet thruster through the back as well. Not sure it will work but it 's a crazy enough idea for at least a ponder on. Other option sounds like cooling.

Oh and don't burn yourself on the motors I am the only idiot allowed to do that.

Peter

[greenman407]

Today was the day. After running for about 45 mins, and pulling it from the water and opening up the Subdriver to take temp readings, I have come to a conclusion. Although big increases and improvements have been achieved, these 12 volt motors are not the answer to this problem. In all fairness to them I was running them at full throttle for a half hour. The temperature buildup was that it got to 140 degrees+ on the motors. That is not sustainable. Im looking for motors that are so efficient, with this package, that the temps will stay at no more than 120 degrees. That with running full throttle, with no cooling. Why so much full throttle? Because this thing is a BARGE in the water. It takes a lot of power to move it. There is a lot of inherit drag in those recessed windows and all the slots on the superstructure. I need a power source that is way overkill, so that its just idling along, so to speak. My new motors are in the works. He emailed me yesterday on the progress. Humor me.

[greenman407]

The Seaview goes in the water tomorrow for a test of the new motors and thrust bearings. I picked up a temp gauge and ill be testing the motors for temp and power fade after a good run at top or near top speed.

[greenman407]

Cabal Report.........................Me??? Thanks for the confidence and the opportunity. We will see. In the meantime, I start a new job for a Geo-technical firm in less than two weeks, so I will have less time on my hands than I have had. And I still have so much to do.

[He Who Shall Not Be Named]

I hate you!

M

[trout]

We will run it like this next week and see how she does as well as monitor the temperature of those motors. From there we will decide whether or not to install the new superwind motors that I have coming.

OR add some hydroplanes and get that sub skimming the surface. Way to go Mark! I look forward to more info. I think you did some amazing work in hunting down and improving the performance issues.
Kudos to you!

[Kazzer]

This is very interesting about the thrust bearings and your findings deserve reward. I suggest fame (and maybe not fortune) will now be yours, but only if you write us up a cabal report with diagrams and photos so the less able can benefit from your work! We'll publish it in our knowledge base with full accolades.

:-)

[greenman407]

How much difference did the Thrust bearings on the Impellers make? Are you ready for this???? A almost 50% increase was realized in todays test. Not only is that going to make her faster, its also going to help keep the temperature of the motors down. Just to recap a couple of days ago, I installed two new 12 volt motors from Caswell and took the time to break them in first. That situation netted a 15% increase in thrust over the previous 12 volt motors from Caswell that were not broken in.
So the original Speed 400 motors and 4 bladed impellers in this thing, from 5 or 6 years ago, gave me 3 ounces of thrust. It moved it but you had to run full throttle to make you feel that you were going somewhere, you know.....like saving the World. At Davids suggestion I cut two blades off the impellers, and that got us up to 4.5 ounces. When I moved up to the 540 twelve volt motors, it put us at 8 ounces of thrust. With the Thrust bearings, we are now at 15 ounces. Not bad. We will run it like this next week and see how she does as well as monitor the temperature of those motors. From there we will decide whether or not to install the new superwind motors that I have coming. I can always put them in the Dual prop Albacore.

[greenman407]

A little bit Today. Pretty much got it put back together. I will test her in the INFAMOUS kiddie pool, under the shade tree, tommorrow. We will see how much of an increase we get in thrust. Following that an actual submerged test, to see if the motors overheat on a sustained run.
It will be a couple of weeks before the much vaunted, modified 540 motors get here. Ill post all of that stuff, right here, so yall dont go too far now ya hear.

[greenman407]

BE CAREFUL! SSHHHHHHHH! Dont let Rick Teskey here you say that. ssshhhhhhh..........

[He Who Shall Not Be Named]

You are one stubborn SOB, Mark! ... I would have tossed that hull into a wood-chipper years ago!!!!

Never say die!

M

[greenman407]

I did order those motors by the way. Two week lead time. Also I drilled two holes for easy access to the thrust bearings so that I can blow out the water and inject "Blaster" and light weight oil to lube. This of course is on the bottom. In the upcoming test in the kiddie pool ill see how much water is coming out of the holes to determine if I will cover them by some means or not.
Impellers and thrust bearings in, and covers back in place.