Apparition upgrade

[penz]

I finaly got my apparition in the water today! Still got a few things to work out but so far all seems ok. I ran for about 4 to 5 min then brought in to check temps. What I did not expect to find was water in the hull!! I need to pin down where it is coming from and seal it, lucky none of the electronics got soaked and all is ok. Any advice on problem water leakage areas? Temps were ok, motor 105, esc 125, batts 85, it was about a minute from when i got it out of the water till i got the hatch off and checked the temps. I saw a good steady stream on the water cooling exit so that all seems to be working well.

I was not able to hit full speed... It was porpusing too much so i had to let off, I was going to move the batts forward a bit to see if it would help but when I found water in the hull I called it a day. So there needs to be some adjustment done there to level it out. I would say I never really got over 75% throttle.

So far I am very impressed. Speed was good, will improve when I trim out the boat so i can open it up. Motor ran good and cool on 4s so far, hopefully next time i can really open it up for some better temp data.

Here is a small video, more to come soon.

http://www.youtube.com/watch?feature=player_profilepage&v=nwK1N2wxMsc

[penz]

I put silicone everywhere water could possibly get in so hopefully that stops the water from getting in. I also droped the prop about an 1/8 inch so ill see if that helps with the porpusing.

Plan on going out today and hopefully getting some full speed runs. I will post more vids.

[sailr]

Pressure check the cooling lines. I pull the line off the rudder and then while holding a finger tight over the outlet, suck on the line you took off the rudder and then place your tongue on it. It should hold the suction. If not, you may have a leak in the cooling lines or water jacket.

Another place for water to get in is up the shaft. If possible, put a piece of silicone tubing over the stuffing tube and shaft.

One more way to check for leaks. Tape the hatch up tight and hold the boat under water in the bathtub and watch for air bubbles coming out.

[FighterCat57]

Make sure the prop dog is adjusted snug against the strut. If there's a gap, it will suck water into the hull. It's the nature of the 2 piece setups. No prop dog gap needed since the don't shrink under load.

[penz]

I did the pressure check on the lines and that was all good. I was wondering about the shaft... I was thinking some shrink tube and heat it up just enough to be snug, then the grease should lube it. I have some silicone tube also I will see if I can get it on there. I did notice where the rudder assembly bolts on the screws were just snug... and it was not completely flush... I put silicone all around it so that should take care of that.

Bathtub idea is brilliant! I will do that and check for bubbles to pin point any leaks, thanks for the tip!

[penz]

I will check out the dog, I think there is a tiny bit of play, if so ill take care of that.

[penz]

Well got it on the water again today but it only lasted a few minutes... Prop threw a blade... And still getting water inside!!!
IMG_20110708_195346.jpg

Blade was a cheap $1 plastic turnigy aquaprop, not sure if it just failed or just cant handle the power. I have one more so ill give it a go, then its on to a good metal prop.

I tightened up my drive dog and sealed all possible leak areas with silicone... I think its coming in through the shaft. Im going to put some shrink tube/silicone tube whatever works better and see if that helps. Also didnt have time to put in the tub I will do that before I go out next time.

I only ran about 3 to 4 mins but it was all full throttle speed runs, motor was 105, esc 130. I think the motor can handle a little more prop, but that will draw more amps and not sure if the esc can handle it. Only one way to find out.

Seems as though dropping the prop a bit helped out with the porpusing, can probably still use some adjustment but ok for now.

Here is another small video, you can hear the prop go haha! Any advice on trim adjustments anyone??

http://www.youtube.com/watch?feature=player_detailpage&v=5gEGiHbn30Y

[Alexgar]

Those props are no good not reinforced I bought about 5 pairs of different sizes and im lucky to get more than one run before they crack or shear a blade may be good but not for high power setups

[Alexgar]

Try a ul1 prop

[FighterCat57]

I'm surprised that prop lasted that long. They are just plastic. You can use the K series props from Graupner. They work great. A piece of #129 brass will shim the prop shaft. OSE sells them pre-cut as shims too.

You're lucky it didn't bend the prop shaft when the propeller broke. Most times if only 1 blade left it will bend the shaft. (ask me how I know)

As for the water in the hull, is it puddling around the coupler at the drive tube? If so, check that the strut is fully engaging the stuffing tube. The prop dog gap looks good from the photo. The only other piece is making sure there is enough grease in the flex cable.

Moving the COG forward should help the porpoising.

Hope this helps. =)

[penz]

Thanks for the advice guys. I'm glad I didn't bend my shaft... now that you mention that ill just wait for to get a metal prop before I run again. I'm thinking either the octura x440/3 blade or x442/ 2 blade. What are the differences between a 2 blade and a 3 blade, I'm guessing 3 blade will create more thrust with less total diam vs a 2 blade? But other than that?

I will get the water thing figured out. I was thinking the same about the porpusing, got it close enough to where moving the batts a little should help.

[penz]

Well i ordered the last octura x442 prop in stock from ose. Unfortunately they were out of the 3/16 brass tubing i need to make this prop fit on my 4mm shaft. I did some searching and found the same tubing on hobbylinc.com and ordered from there. So i am now awaiting my new prop to see how she runs.

The prop i was running was 1.14x42mm, the octura is 1.4x42mm. Same outside diam but the octura has more pitch. Using the speed calc as a refrence the new prop will add about 8 to 9 mph to my top seed.

[penz]

Finally got it on the water today. New octura x442 prop bal/polished. Adjusted the strut to be level with the bottom of the sponsons with zero pitch and wow runs totally different. As soon as it gets up on plane it just flys over the water now. No gps but I can tell its faster, I can also hear the motor reving higher due to better strut adjustment. Temps still good.

I didn't get any vid this time, nor run very long because it got dark on me. I will take some vid soon with the same setup, I think everything is pretty much good where it is.

[PumpedNotch]

Ok so what was your final motor and prop choice? And any clearance problems with the motor/hatch?

[penz]

Ok so what was your final motor and prop choice? And any clearance problems with the motor/hatch?

Check out post #15 on this thread, no clearance problems. And x442 as stated in my last post.