Hydro&Marine MissUS

[mikesf]

Just received it.

http://media.share.ovi.com/m1/s/0945/55a6765f5e304d9eb51e440f8ca6fdec.jpg

This will be my first hydro scratch build and I am looking for some basic guidelines before I start drilling... Anyone that can help, I appreciate it...

Hull data: 23" long 10" wide, I am thinking to use a NEU 1115 1.5D with a .130 flex, would that be adequate?

Thanks in advance...

[m4a1usr]

Hull data: 23" long 10" wide, I am thinking to use a NEU 1115 1.5D with a .130 flex, would that be adequate?

Thanks in advance...

Wouldnt be my choice of motor. Something like a 1509 or a 1512 would be where I choose from. Depends on how many cells you want to run as to the winding. The new 1400 series would do well too. Thats a fun hull you got. I have a Bandit, very similar in size, that does very decently using 4S and the SV27 motor.

John

[hydronut]

Wouldnt be my choice of motor. Something like a 1509 or a 1512 would be where I choose from. Depends on how many cells you want to run as to the winding. The new 1400 series would do well too. Thats a fun hull you got. I have a Bandit, very similar in size, that does very decently using 4S and the SV27 motor.

John

:thumup:I agree a Neu 1509 1.5d on 2s would make that hull scream or for a bit calmer set up and less costly, go with a SV-27, Black Jack 26 or a AQ UL-1 motors and esc's on 4s.

[mikesf]

What do you think about this? To save weight the brass tube runs only up to the point it exits the hull. After that a hard teflon tube is running up to the prop. Would you think it could work like that?

http://media.share.ovi.com/m1/s/1000/98edd292772a40fda9324071b57de404.jpg

http://media.share.ovi.com/m1/s/1000/4f109ce3f64b4a89bb3c740eca801acc.jpg

[Ub Hauled]

that's pushing your luck a bit.
on the inside I can see it happening since the motor should go around there
somewhere, but on the outside the needs to be a brass tube, just the flex will not
be enough to keep you out of trouble.

[Teach]

cOULD HE GET AWAY WITH IT IF HE WENT WIRE DRIVE?


Curse you caps lock!

[Ub Hauled]

YES! I actually have my wire exposed on my Shovelnose... it rocks.
He'd have to shim it down so that the wire is tighter in the stuffing tube
and place the motor forward a bit so there is more room for the natural
bend of the wire to occur, one does not want a sharp bend.
NO "S" BEND!

[Teach]

YES! I actually have my wire exposed on my Shovelnose... it rocks.


How do you keep water from coming through the liner? Or just not worry about a little water?

[Ub Hauled]

well... on the inside the stuffing tube is a bit longer
and higher so it can attach to the motor at the proper angle,
then you cannot use an unholy amount of cells, just something that is
proper to the size of the boat (so it does not sink too much), and finally
a little piece of silicone tubing that connects on the stuffing tube and
a little bit over the wire, it should be just a little over the wire drive, snug
but not tight so it minimizes the access of water.

[mikesf]

Thanks for all the replies, I might be the second or third person in Greece that builds shovelnose hydros. We are a country that it's coastline is half of Africa's(true) with a fraction of it's size and as you may understand everybody races or plays at the sea where access is easy. The sea is never calm so ony monos and big cats here...

That's the second shovelnose that I own and I am amazed with them for various reasons. The most important is that I can have a scale model that can run at non-boring speeds like the other scale vessels built everywhere. Not to mention their beauty...

On the subject now, I have hooked up the motor and esc and gave it a good beating. The teflon tube didn't move even a tiny bit so I might take the chance to secure it a bit more with epoxy and try to run it like that... The only thing that concerns me is the impact that the water will have on the teflon when turning...

Thanks again and any comment (good or bad) is mostly welcome...

UPDATE

Motor mount measured and epoxied...

http://media.share.ovi.com/m1/s/1003/76ea141f01294ce3a1c21761bb14ef88.jpg

Neu 1115 with cooling jacket on watercooled motor mount and behind it a CC120Hydra. I really love the space and the flatness on the hull on shovelnoses...

http://media.share.ovi.com/m1/s/1003/ed9a30f72a2c4aaa980ec2ed550cf1de.jpg

Mike...

[Ub Hauled]

Mike, shoot some video and post it here please!
:yeah:

[mikesf]

Will do for sure, as I see most of the test would be done next week...

PS, on the wiredrive do you have a mount for it between the sponsoons to keep it in place? Can you post a pic of the bottom of your shovel?

Thanks,

Mike

[Ub Hauled]

Will do for sure, as I see most of the test would be done next week...

PS, on the wiredrive do you have a mount for it between the sponsoons to keep it in place? Can you post a pic of the bottom of your shovel?

Thanks,

Mike

Will post, just gimme some time to take the pic and post, it's 3.20am here :yeah:

[mikesf]

Anytime it suits you, no rush...

Thanks

[Teach]

NICE motor mount, is that ETTI's?

[ghostofpf1]

Isn't there a chance that the unsupported cable will whip and knot under load with only the Teflon tube for support ??
Steve

[Ub Hauled]

Isn't there a chance that the unsupported cable will whip and knot under load with only the Teflon tube for support ??
Steve

Bingo! Yazzy!
:yeah:

[mikesf]

NICE motor mount, is that ETTI's?

Yeap it is ETTI's 380 watercooled...

[mikesf]

Isn't there a chance that the unsupported cable will whip and knot under load with only the Teflon tube for support ??
Steve

Teflon is glued both in the strut and in the brass tube and under NO load it stays put. I will make a test under load and in the slightest vibration I will install a full length brass tube... I eant to just give it a chance bare...

[mikesf]

On second thought, please pardon my many questions, but how can the flex knot since under load is wound up tight?

Thanks!

Mike...

PS. Servo's on...

http://media.share.ovi.com/m1/s/1005/0a16eaa3c17b4035a8351653e3826719.jpg

[ghostofpf1]

I only know that I had a cable knot up on me once and I only had a short distance of unsupported cable right in front of my strut in a hydro mite.Bunched up inside the Teflon tubing and was so bad I had to cut it apart to repair .Look at every other example of that type of running gear and you'll see fully encased (by hard tubing) cables everywhere.
If you decide that you should use full length tubing you can just splice a piece on if you left some sticking out of the bottom using a small piece of the next size up tubing as a sleeve coupler. If you cut it flush then you can use heat on the brass tubing inside the boat carefully until the epoxy softens enough to pull it out to start over.
Before you install the new longer stuffing tube anneal it with heat and it will bend far easier.
Good Luck
Steve

[m4a1usr]

Isn't there a chance that the unsupported cable will whip and knot under load with only the Teflon tube for support ??
Steve

You must mean kink or deform. It has happened to many who choose to leave either end of a stuffing tube unsupported. Depending on how severe the flex loads its very easy to induce occillations or rotational delfection where moment can increase with rpm.

John

[eddieh]

I love shovels!! I would listen to the fellas, and support that shaft all the way to the strut and almost all the way to the motor! (coupler) I do not use the teflon liner myself but that is just my preference, I slip the brass tube all the way into the strut, I bend the tubing using the cable and liner but then leave off the liner when installing. I Put a little piece of fuel tubing just at the end ( inside hull) with anopther piece of tubing over it just grazing the flex shaft and plenty of shaft grease.

[mikesf]

Got scared and extended the brass tube...

http://media.share.ovi.com/m1/s/1013/9fd96c49523b48e489571495e0a9d879.jpg

Almost finished...

http://media.share.ovi.com/m1/s/1013/3566127dd69e411da86308fd1a0ef457.jpg

I need to install the turnfin and it is ready to fly low...

http://media.share.ovi.com/m1/s/1013/bd59037d7870401f8b979d0df3e56864.jpg

[Ub Hauled]

I don't mean to sound pessimistic, but I think you still may encounter problems with that much flex exposed... I had problems before with a little more then 1/2" exposed...
I think I owed you a shot of my wire drive...

[ghostofpf1]

:doh:
Why did you stop there.???

Steve

[mikesf]

With the full length brass tube I couldn't get the strut level with the sponsoons when sitting on a flat surface, and as I believe that I can't find a much wiser advice on hydros anywhere than RRR I extended it to the strut, epoxied with a bit-more-flexible-than-others epoxy and managed to get the result I wanted without exposing the flex.

http://media.share.ovi.com/m1/s/1017/c17c6228a32241ad83bd193ab8bbcc3e.jpg

Sneak peak inside:

http://media.share.ovi.com/m1/s/1017/0ed975827da04c0ab304a45fd6aa1081.jpg

Total weight:
http://media.share.ovi.com/m1/s/1017/4d3ac856ca9348e8a6b0227bf7c8d866.jpg

[mikesf]

Turn fin installed...

http://media.share.ovi.com/m1/s/1019/1ae4cd41fa034966beb0ca8dc23c4ad3.jpg

[Ub Hauled]

nice and sharp?

[mikesf]

Sharp as a knife...

[Ub Hauled]

Ginzo knife or 99cents knife?
j/k
:D

[mikesf]

Chinese harakiri blade sharp... :):):)

[mikesf]

Did a small test yesterday, sadly no one to shoot video and I have two hands:doh:, but bottom line is this. I test run my boats in a very shallow but quite big artificial lake with contrete bottom here in Athens and because of the fact that my other shovelnose had dived and hit the concrete (4-5" of water in there) I was very conservative...

1. It runs FINE, when the tunnel is filled with air it glides very nice.
2. I runs straight with trims at 0.
3. The motor, although only pushed halfway seems a perfect match for the hull
4. Prop was a 36mm Graupner carbon filled, want to test a bit more before I buy a metal one

I will visit a lake soon and give it a good push... Stay tuned...

[mikesf]

Installed a full lenght brass tube to be 100% sure that nothing will fail.

http://media.share.ovi.com/m1/s/1044/ab646a25a7774b519abc3ae8e634380e.jpg

http://media.share.ovi.com/m1/s/1044/8035448bdb0041db84df52118335a4c1.jpg

[mikesf]

After a few runs I decided that the NEU was an overkill for the hull rendering her unstable at full throttle so I opted for a Scorpion Outrunner with a 60A ETTI ESC spinning a 36mm prop. The results were great, the motor(which at first it seemed small for the hull) was a perfect match, it fills the tunnel at an instant, and launches the boat at a speed the hull can handle. Fast enough(don't have a gps) but no flipping. 100% happy now...

http://media.share.ovi.com/m1/s/1067/a68708f6fc2145aaae5e33352254aa59.jpg

[Teach]

Awsome! Congrats

[mikesf]

Thanks pal, I really enjoy tackling with the particularities of the shovelnose hydros and their aristocratic running...

[eddieh]

Mike, well your boat looks great, I do think that the tube is a little, well how do you say it, deep maybe and the curve is kinda crazy, I know you have put lots of work into this but use a softer s curve, I personally would cut thet stuffing tube out, and redo it, put an o ring around the tube where it enters the hull and tack it down with zap, then use jb weld the o ring will act as a dam and will flow out very nicely, as I said I do not use the teflon and my tube goes into the strut, it is a nice neat arrangement you are costing yourself a few MPH to say the least, regarding the turn fin, I usually set mine at a small angle (toward the inside of the boat) maybe something like 3-5 degrees... I am just trying to help

:wave:

[mikesf]

Thanks Ed, I have thought of it all and re-did the tube... How does it seem?

http://media.share.ovi.com/m1/s/1159/640961f21b91463695e28b6ce8b696d4.jpg

[mikesf]

Since hardware-wise I am happy and since she's be sitting on the shelf getting jealous of the "Pink Lady" getting all the attention I decided to start decorating her to scale details...

http://media.share.ovi.com/m1/s/1295/7f35a0ba51574fa491f41f6ec3de1bd1.jpg

http://media.share.ovi.com/m1/s/1295/b3695de4a34b4113bdd08184d4d21836.jpg


She is waiting now for the tail fin...

[chuckc]

I don't know why, but the skid fin seems a little out of place. I normally place the skid fin at the point where the ride pad meets the sponson downward side. If it's doing the job, leave well enough alone. The Skid fin is really a pivot in the turns and I really amazed it 's not giving a problems being in the middle of the ride pad. Just a few pennies for whatever this morning.

[mikesf]

Well, that was my first classic hydro scratch-built and some things, now, seem not correct. Furthermore I reassure you that the fin is causing absolutely no problems, transmiter trim at 0, rudder sharp straight and the boat can draw straight lines in a football field.

Begginer's luck? Maybe...

[chuckc]

If it works, Thanks great, just never would have thought. Good builds. Love your Hawaii Kai.

[mikesf]

Thanks Chuck, I am also working on a 1/16 Miss Madisson right now... will post some pics when it will be in a descent state...

[mikesf]

She received her tailfin yesterday, now she seems somewhat to scale...

http://media.share.ovi.com/m1/s/1332/6199e75900b3429fa6b7aae9b660dfcc.jpg

[eric_laermans]

Is there any movieclip of Miss Thriftway at full speed over the water?

[Randy Naylor]

Nice looking hydro

[mikesf]

I am always open to comments and suggestions, especially from people that know what they are doing. Just for the record the boat is running fine for the past two years, the flexshaft is like new and the boat is fast enough for my taste. I have followed the instructions of the constructor of the hull, giving me two options, first as it is and second with one bend on the tube and the motor angled towards the hull.

If I had to do another I would chose the second option to see the differences but the first works for me. One reason that I am glad I did it like this is that I am running it with an outrunner and this way I have the nessecary space, otherwise the rotating can would be ridicusly close to the cowling...

Look at her running...

http://www.youtube.com/watch?v=WZB7EuWW8oA&feature=mfu_in_order&list=UL

[Randy Naylor]

We have done real well this this type of bend.
http://img585.imageshack.us/img585/858/0008ij.jpg (http://imageshack.us/photo/my-images/585/0008ij.jpg/)

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