Seaview

[trout]

Mark,
I remember Edmund Scientific hard a rubber fetter that absorbed vibration, let me see if I can find it.......
not feet, but sheet. What about this? http://www.scientificsonline.com/sorbothane-sheets.html
Peace,
tom

[greenman407]

AND ANOTHER THING! I dont like all the fluttering of the dive planes on all my boats. You know......where the APC picks up vibrations and transfers it to the planes.
Im toying around with an idea.............................................. .................................................. .................................................. ....OH! (dementia) Ive been thinking about taking a prescription bottle and filling it with silicone gel. Then putting the APC inside it. The problem is obvious however. The APC has to be mounted to maintain zero bubble to react to changes in pitch. Anywhere you touch the APC(mounting surface) is going to transfer vibration. Even the APC control wires transfer vibrations thru them. Even moving it forward, the vibrations go thru the whole boat. Im working on it.

[greenman407]

The motor builder told me that up to 150 degrees is OK. His motors are built to take it. These motors are custom handwound. He uses better wire with thicker insulation.
At any rate, here are some pictures of the gearboxes that Im modifying to accept grease.The reason for this is, I guess all the motor swaps on this thing, I must have damaged one of the seals, because on the last test, there was way more water in the Subdriver than I wanted to see. This should keep it high and dry. This will pack waterproof grease down around the seals and not let any water into that area.

[greenman407]

OK, with the new motors at 12 volts turning 4 bladed empellors we are up to 21 ozs. of thrust. The kiddie pool is like a whirlpool bath with the Seaview in there running. But, the motors are getting hot. Running for 5 minutes at full throttle the motors were at 130 degrees. I may test for 10 minutes next time and see. Or I may take out the 3s Lipo and put in a 2s which is what those motors are rated for anyway. Or I may take out the 4 bladed empellors and reinstall the 2 bladed.
Another endeavor on this project is to take the external gearboxes and make them into a force feed greaser for the motor shaft seals. If I seal it all the way up and install a small zerk fitting in the thicker part I can inject it with grease and keep water away from the shaft seals.

[greenman407]

I would have already posted the results of my latest test, If it wernt for.......there was no test. Well.....actually, there was but it failed due to technical difficulties. For one thing the thrust has increased to the point that the forward "push" on the empellors is pushing the Subdriver forward causing the drive shafts and there Dumas nylon connectors to dis- engage and strip off the drive tabs. Embarrassing! I never installed a pin to locate the Subdriver. Ive always used rubber bands to hold it down. I hope to have the results of a test this weekend or Monday at the latest.

[greenman407]

I started thinking about motor capacitors for these things....and guess what. These have built in SMD(surface mount device) boards already installed. So I wont need them. Just as a side note, its my understanding that motors used in a model that uses a 2.4 GHZ radio, dont need any type of motor suppression.

[greenman407]

This is the 15th visit to the Drydocks for this Rick Teskey/D.Merriman/Mark Green Seaview. Its been an educational tool for me in my ever continuing Quest to DOMINATE the little pond down in Clearwater, Florida 33755. If I were to add up the tab of my expenditures over the years for my Entertainment in this Hobby................I think I would have to be committed to Hospice for daily care. As it is I am afraid to think about it. But it keeps me entertained..................legally.

[greenman407]

A little here and there. To get the old motors out I have to cut the shaft. This because the brass gears are "sleeve retained" onto the shaft and the only way to get them off is to heat them up. That would ruin my high tech shaft seals. So I cut the shafts just behind the gear, then pull out the motors after de-burring the shaft left sticking out of the motor. Then a propane torch on the gears will cause the epoxy to release. Then, just a matter of cleaning out the old hole and re-sleeve retaining the gears back on. I hit the new motor shafts with the edge of a Dremel blade to rough it up, preceding the application of the Permatex stuff. Works great. I still dont know if the 20 amp Mtronics ESCs will handle the new motors now that I have 4 bladed empellors in place. We may be looking at making a swap. Ive got two 40 amp Jomars on standby. If I dont need them they will go into the Portofino, thats in drydock awaiting modifications.

[greenman407]

KO......I mean OK. Tearing it apart again and installing the new motors. The motors req. a 3mm screw. I didnt have any so I used 6/32 last time......I think. At anyrate last time I re threaded the motor screw holes with a tap. I didnt want to do that this time so I was on a hunt for 3mmx.5mmx10mm countersink head screws. No go at Lowes or homey depot so I had to order some good ones. 316 S.S. from Mcmaster&carr. Take a couple of days. Anyway here are a few shots. The armatures are definitely shorter on these 540s compared to the 550s.

[greenman407]

Ive got the day off tomorrow. .....Guess what im going to be working on? Ha Ha!

[greenman407]

In order to install the new APC, as has been my recent custom, I put down some bubble wrap first, to try to reduce vibration feedback to the APC. I found out that silicone seal dissolves the bubble wrap into a very hard substance that will Cut you, if you are not careful. That will also transfer vibration, instead of cancel it out, so we dont want that. So, instead of using silicone this time, Im using this stuff(see picture). So , I cut two pieces of bubble wrap and installed them, one on top of the other, and glued them down. Now for the Apc, right on top of this mess.

[greenman407]

Today, I got out the kiddie pool and filled her up for the test. After installing the four bladed empellers, the thrust measurements dropped from 15 ounces down to 12 or 13 ounces. This tells me that we have exceeded the power of the Caswell 12 volt motors. So, now, with our back against the wall, we have little choice but to proceed with motor replacement/upgrade. We will now be installing the new motors and see what we get.
Also, the Subtek APC has bit the dust. Its been acting funny. When you first power it up, it holds the planes perfectly. But after a few minutes the planes slowly creep to a new position way off from where you have it set. So, no 21 gun salute for this thing. Its life was way too short for the money I paid for it. Hopefully, its replacement will demonstrate a greater degree of longevity.

[greenman407]

And another thing while Im thinking about it. Those Dumas drive couplers will probably have to go in favor of something more robust. Remember the pictures that I posted of the wear on the old ones?

[greenman407]

Yep....Gotcha. This camera angle distorts the view. Its right as is.

[He Who Shall Not Be Named]

make sure the curved face of the blades point forward.

M