OM21 build

[saleens7]

well i just ordered a 33mm and 34.5mm prop as well as some hatch tape....too bad i have to wait until the 7th until its shipped out... ...

i wish i hadnt of lost that prop...

[saleens7]

well i got the props and hatch tape in today (thanks for the quick shipping steven).....ill put on the 33mm prop and see if i cant take a vid...

[saleens7]

sorry, no vids yet, but twice today on the 2nd run (with the 34.5mm prop) the boat stopped...the rudder would work, but not the motor....i checked the wires and they were all plugged in.....im thinking the esc might have thermalled? i dont know if the proboat esc has a thermal cutoff though...im trying to figure out whats wrong though....

[saleens7]

im uploading a vid right now...its using the 33mm prop so its slightly slower than if i used a 34.5mm but its much more controllable and the motor doesent get that hot (it passes the 5 second test)

[saleens7]

oh yeah, forgot to add, the servo broke loose from the hull....(probably because i didnt sand it before it went into the hull...) well now i sanded it and the epoxy is drying...next time ill get a vid of the 34.5mm prop and see how it performs....

[saleens7]

ok here it is....sorry for the low quality....my camera has one that is high quality than this, but you can only record for about 8-15 seconds...

http://www.veoh.com/videos/v952348bngtAHgw

[saleens7]

well, for some reason, every time i run the 33mmprop the esc cuts out and i have no throttle (i still have steering though).....i think its pulling too many amps for the esc to handle....i have another esc that can handle more amps, ill give it a try...the thing is it has no connecotrs on it, so ill have to steal the ones from the proboat esc and use em on this one....

[saleens7]

well i took it out with the new controller and 34.5mm prop and it didnt stop, but it glitched alot....anymore than 20 feet from me and the throttle would turn off for half a second every other second....the motor has caps on it and the receiver has foil on it...and yet it still glitches....

[saleens7]

well, i got tired of the glitching, so i went b ack to using the old esc.....i guess the motor pulls more amps than this esc can handle on the 34.5mm prop, so i went back to using the 33mm prop....im wondering if exposed wiring could have caused the glitching with the other esc...as the wires that went to the Rx were cut by a prop and i had to solder them together (they are covered by shrink wrap though)....

anyway, since i used the connectors from this esc to the other one, i just soldered the motor wires to the esc wires...anyway, im charging up the batt now....

[saleens7]

is it me or are the last 11 (12 if you include this) posts are just mine..

am i just talking to myself or what?

[saleens7]

well i tested it to see if the esc worked right and the shaft vibrated violently....to the point were the vibrations got so bad the shaft would slow down....the shaft isnt bent (whew).....but i wish i had more of the stuffing tube i need so i can make that strut...till then, i dont think i cam run this boat anymore in rask of damaging the shaft.....

if i ever build one of these hulls again, im going to use a flex shaft.....and a brushless....and maybe even lipo as well:D

[saleens7]

well i cut the shaft shorter to see if the vibrations willl stop....they are the same as before...and less than an inch of the propshaft is exposed....

[Doug Smock]

Saleens,
Your motor isn't secured properly, flex coupling isn't straight, the shaft is bent, the BUSHINGS in the tube are worn out, or your prop is WAY out of balance.
Take the prop off and see if the problem goes away. It should be pretty easy to figure out.
Doug

[saleens7]

the motor is secured nice and tight (the bolts holding it on are tight and the motor mount is firmly secured to the hull)...the shafts isnt bent (just tested)..without the prop it still vibes, the coupler seemes pretty strait..i cant see any sight of even a slight wobble when i spin it...im...i dont think there are bushings in the tube....the inner diameter of the tube is just slightly larger (by a fraction of a millimeter) than the diameter of the shaft...

[saleens7]

ok, well i think i might have found the problem....when i rotate the shaft freely in the tube (without the couplerattached and no prop) it feels like there might be a very slight bend in it that could cause the vibrations when spun faster.....