RE: AquaCraft U-18 Miss Vegas Hydro Thread_Make it Fast!

RE: AquaCraft U-18 Miss Vegas Hydro Thread_Make it Fast!
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RE: AquaCraft U-18 Miss Vegas Hydro Thread_Make it Fast! - 8/2/2006 11:29 PM

vics71

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terry, thanks alot for the info. i'm running 20% for the first 5-6 tanks and then i should switch to 30% maybe??

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RE: AquaCraft U-18 Miss Vegas Hydro Thread_Make it Fast! - 8/3/2006 12:03 AM

Grimracer

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I seem to be reading allot about the rudder not supplying enough water to the Aqua engine to keep it cool. hum.. a few notes that come to mind and the way i set my boat up..

Double check the cooling lines for any blockage.. I wanted to see if my rudder was supplying enough water to i drilled a hole in the top deck (same side as the water outlet) and stuffed the tube out the top of the sponson. Just the rubber tubing mind you. I like to have my water shoot upward...med Prather line

Here is what i found.. do not try this at home unless you are willing to risk a motor..

I ran the boat and the water was shooting out the line like no tomorrow.. I would say though med size line (which by the way will not fire the water as high as small) I was seeing a foot or more water shooting up in the air stream... I began to pinch off the water (just a little at a time) and.. well.. started to pick up some speed.. topped out at around 45MPH.. It looks like (safe for sure) we have more then enough water.. the little motor liked more heat.. BTY this is typical of a small motor like this.. Im really not stating anything new here.. we pinch water on our race boats all the time..

Again if you do not have your fuel and plug right dont go pinching off your water.. its going to cost you a motor if you do it wrong..

Is the Aquacraft rudder supplying enough water... yep.. its working great.

ROCK ON DUDES
Grimracer

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RE: AquaCraft U-18 Miss Vegas Hydro Thread_Make it Fast! - 8/3/2006 12:13 AM

Russ Williamson

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Intersting info about the water pick up in the rudder and water coming out the water cooling exit. I'm running the stock rudder (except shorten and sharpened and with a second bolt in it near the bottom of the bracket) in my Vegas which has an O.S. .21 VZM in it. There is more than enough water cooling with the stock rudder. In fact, the Vegas rudder water opening is about twice the size hole in most all other rudders, even in the super high performance race boats.
The faster you go the harder it is to see the spray coming out behind the port sponson. The other day when Grim and I were at the lake testing, Grim put his water exit out the top of the sponson, it was really cool and easy to see the water spraying up out of the sponson at full speed

If there are concerns, might check to be sure your water line and hole in rudder are not clogged.

Thanks,
Russ

quote:

ORIGINAL: t munn

As james has said in past posts the faster you go the less water comes out the pee hole.
I am contemplating all the twisted updates but for now we're running great and pretty much stock.

Kinda like nascar

Thanks to everyone that has helped me out...

Terry

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RE: AquaCraft U-18 Miss Vegas Hydro Thread_Make it Fast! - 8/3/2006 12:17 AM

Jerry Dunlap

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re: topped out at 45 mph

Seems like Mike told me he was running now an O.S. 18 CVR-M in his Miss Vegas . In a previous post, Mike mentioned this as an excellent choice for "upgrading" the engine and still be able to use the existing engine mounts and hardware.

JD
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RE: AquaCraft U-18 Miss Vegas Hydro Thread_Make it Fast! - 8/3/2006 12:31 AM

Russ Williamson

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Hi Dunny! (you know all of this is your fault

Mike was running the CV and now I think he has the P/S AQU engine back in the hull and it is topped out at 45mph. Before I started running the .21, I dropped in the O.S. CV marine in one of our samples. It does drop right in with no mods needed. Get the non-pull start, a Prather starting belt and 12v starter, and you will gain MPH over the AQU .18. (Pull starts always cause some drag in an engine)

Rw

quote:

ORIGINAL: Jerry Dunlap

re: topped out at 45 mph

Seems like Mike told me he was running now an O.S. 18 CVR-M in his Miss Vegas . In a previous post, Mike mentioned this as an excellent choice for "upgrading" the engine and still be able to use the existing engine mounts and hardware.

JD
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RE: AquaCraft U-18 Miss Vegas Hydro Thread_Make it Fast! - 8/3/2006 12:34 AM

SigMan

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I WANT ONE, PLEASE !

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RE: AquaCraft U-18 Miss Vegas Hydro Thread_Make it Fast! - 8/3/2006 12:38 AM

piper_chuck

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quote:

ORIGINAL: Russ Williamson

Hi Dunny! (you know all of this is your fault

Mike was running the CV and now I think he has the P/S AQU engine back in the hull and it is topped out at 45mph. Before I started running the .21, I dropped in the O.S. CV marine in one of our samples. It does drop right in with no mods needed. Get the non-pull start, a Prather starting belt and 12v starter, and you will gain MPH over the AQU .18. (Pull starts always cause some drag in an engine)

Rw

So, how's the relative speed with the 3 engine choices, .21, original, or the CVR-M?

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RE: AquaCraft U-18 Miss Vegas Hydro Thread_Make it Fast! - 8/3/2006 12:53 AM

Grimracer

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You can get the aqua up to high speeds.

Bone stock aqua 18.. 38mph
mod Aqua 18...44mph
Stock CV.. 45mph
mod CV.. time will tell.. i suspect with some work we are going to see 50 with this motor.. im not sure how hard im going to try at it.
Stock VZM... jerry? what did you get for MPH.. did you get a reading.. i can not remember..

One things for sure.. the Vegas runs tight. with a sponson mod higher speeds are possible. That just might be next.. it will make larger gains then any motor mods.

Grimracer

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RE: AquaCraft U-18 Miss Vegas Hydro Thread_Make it Fast! - 8/3/2006 1:21 AM

Jerry Dunlap

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quote:

ORIGINAL: Grimracer

You can get the aqua up to high speeds.

Bone stock aqua 18.. 38mph
mod Aqua 18...44mph
Stock CV.. 45mph
mod CV.. time will tell.. i suspect with some work we are going to see 50 with this motor.. im not sure how hard im going to try at it.
Stock VZM... jerry? what did you get for MPH.. did you get a reading.. i can not remember..

One things for sure.. the Vegas runs tight. with a sponson mod higher speeds are possible. That just might be next.. it will make larger gains then any motor mods.

Grimracer

I never ran the Miss Vegas /O.S. VZM 21 against the radar gun. I thought it was doing around 45/46 mph. Russ has probably done more testing now that he has the boat.

JD

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RE: AquaCraft U-18 Miss Vegas Hydro Thread_Make it Fast! - 8/3/2006 2:12 AM

t munn

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I am in farther on my hsn than my bud and am still making power and the engine has not sagged yet his is a tad stronger and running at 140F and i am only around 110F.

Could someone that has one performing really well post up some temps and what temp should these engine run at.
Our .15 in the hammers wrked well at 150F.

Thanks a bunch guys wish I could race with some of you guys and learns some tricks.
Next year we may have 4 at our local pond.

Terry

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RE: AquaCraft U-18 Miss Vegas Hydro Thread_Make it Fast! - 8/3/2006 3:02 AM

Grimracer

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Hea mister T.. how are you, hope your boating is going well.... A temp gun is hard thing to get good data from in RC boating. I do not use one.. Russ can tell you too.. im a nut case with a temp gun.. i use one for most everything.. I have this way cool unit that was used for the military............ o well.. i do indeed love my temp gun..

Better tools here are your ears, a good stop watch and a radar gun...

Most important is the stop watch.. then your ears and then the speed gun... your ears can fool ya.. the speed gun is one of my favorite but its the most expensive.

Terry.. RC boating is a tuners game.. to win races you need to know your setup,, have some luck and practice practice practice. . its not uncommon for me to burn between 20 to 30 gallons in a 6 month time just testing... thats just for MY racing program. I like to and really want to win races.. its what drives me..

P.S. shove as much nitro as your wallet can afford.. if its 25% so be it.. if its 65% better yet.. i have been beaten by boats with less nitro then i might have been running.. I have also went over 70mph in a 40 stick boat with 25% nitro.. it can be done

Keep up the good work.

Grimracer

< Message edited by Grimracer -- 8/3/2006 3:44 AM >

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RE: AquaCraft U-18 Miss Vegas Hydro Thread_Make it Fast! - 8/3/2006 3:23 AM

Russ Williamson

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First test runs with O.S. .21 VZM, sharpened Grim 15/18 turn fin, stock rudder and non-tuned strut (settings) radar was 44mph. (65% O'Donnell boat fuel)

Second test runs with blueprinting the sponsons, sharpening strut and other, plus sharpening and shorter rudder and modifing strut and rudder brackets, sharping all edges of hull, different carb, on-board mixture control, speed was for sure higher but did not have a radar gun that day.
I would guess between 46 - 47mph. Hull still in good heat racing set-up, meaning, not loose or out of control. Still working to get it that way

Also, can still make aggressive left hand corrections, no problem.

This was all with the same sharpend and balanced prop (40x52/3) which has not been modified.......yet

Have fun!
Rw

quote:

ORIGINAL: Jerry Dunlap

quote:

ORIGINAL: Grimracer

You can get the aqua up to high speeds.

Bone stock aqua 18.. 38mph
mod Aqua 18...44mph
Stock CV.. 45mph
mod CV.. time will tell.. i suspect with some work we are going to see 50 with this motor.. im not sure how hard im going to try at it.
Stock VZM... jerry? what did you get for MPH.. did you get a reading.. i can not remember..

One things for sure.. the Vegas runs tight. with a sponson mod higher speeds are possible. That just might be next.. it will make larger gains then any motor mods.

Grimracer

I never ran the Miss Vegas /O.S. VZM 21 against the radar gun. I thought it was doing around 45/46 mph. Russ has probably done more testing now that he has the boat.

JD

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RE: AquaCraft U-18 Miss Vegas Hydro Thread_Make it Fast! - 8/3/2006 4:10 AM

Bruce Frost

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Grim
When you say Mod Aqua 18 what mods are you referreing to?

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RE: AquaCraft U-18 Miss Vegas Hydro Thread_Make it Fast! - 8/3/2006 5:13 AM

Jerry Dunlap

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quote:

ORIGINAL: Bruce Frost

Grim
When you say Mod Aqua 18 what mods are you referreing to?

A real easy mod is to remove the head shim. I did this to my engine and it improved the speed a couple of mph.

JD
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RE: AquaCraft U-18 Miss Vegas Hydro Thread_Make it Fast! - 8/3/2006 8:40 AM

TwistedLiquid

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quote:

twisted.....i dont have any upgrades (YET). Does the stk rudder tuck that far? it moves ever so slightly back and forth. Is the stk turn fin ok at 5 degrees (or just slightly angled inward)? just trying for now to get the boat to go accross the water like its supposed to. thank you all for your info. I will be at the greensboro nc races on August 13th, Thanks

To get the stock rudder to tuck under the boat you need to file the Vegas rudder. Figured the hardware designer would know tucking is good, and make it so it would be moveable, but not so. Filing the front section of the rudder connection plate "the side facing the transom" when installed in rudder swing arm. By filing the top and bottom edge to the shape of a small curve, you will be able to move the rudder to your condition under or out. This will allow you to tuck the rudder a bit more. When you tuck the rudder you will see a bit of improvement on the water flow, but mainly you will corner better and run harder in the straights, do to lift. Dont forget to sharpen and shorten it, dull and to long.

Here is another improvement for the stock rudder. Make it a break away. Leave the rudder in the bracket with center bolt in place. With a 1/8 inch bit, drill one hole above the center bolt and one hole below the center bolt. Place the stock 3mm SS bolt in the top hole with a self locking nut..tighten lightly "use the center bolt for this hole". In your bottom hole place a 440 nylon bolt with a 1/8 piece of fuel line on the back of bolt to hold in place. You now have a break way stock rudder. besure you have the filing done enuff on the back of the rudder connection plate, to insure smooth swing up if you encounter a obsticale in the water. this can be done by filing the top of the connection plate at a 45 degree angle...Happy Modifing.

We dont make the products you use...we make the products you use better...

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RE: AquaCraft U-18 Miss Vegas Hydro Thread_Make it Fast! - 8/3/2006 3:03 PM

Bruce Frost

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I did remove the shim and it did make a difference. What else can you do?

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RE: AquaCraft U-18 Miss Vegas Hydro Thread_Make it Fast! - 8/3/2006 4:12 PM

Kelly Miller

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I am being hard headed about the strut depth, i have carved up a three blade 435 and have felt as like if i get the prop a little closer to the top of the water I will get my rpms. I go into the turns and accelerate like crazy and my exit speed is great but by the end of the straight the engine is sagging. removing the head shims is the only engine mod I have done and did feel a improvement. am going to carve out more strut before testing this weekend. am at about 3\4 at the bottom of the strut now. have not played with the 535 2 blade for quite a while. it seems to me like it will run at the 7\8ths depth but I felt like I was leaving some speed on the table.

Kelly

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RE: AquaCraft U-18 Miss Vegas Hydro Thread_Make it Fast! - 8/3/2006 5:39 PM

Jerry Dunlap

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quote:

ORIGINAL: Kelly Miller

I am being hard headed about the strut depth, i have carved up a three blade 435 and have felt as like if i get the prop a little closer to the top of the water I will get my rpms. I go into the turns and accelerate like crazy and my exit speed is great but by the end of the straight the engine is sagging. removing the head shims is the only engine mod I have done and did feel a improvement. am going to carve out more strut before testing this weekend. am at about 3\4 at the bottom of the strut now. have not played with the 535 2 blade for quite a while. it seems to me like it will run at the 7\8ths depth but I felt like I was leaving some speed on the table.
Kelly

Around my house, it's o.k. to "leave some speed on the table," just don't "leave any pizza on the table."

JD

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RE: AquaCraft U-18 Miss Vegas Hydro Thread_Make it Fast! - 8/3/2006 6:01 PM

Kelly Miller

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Two kinds of beer Jerry, Free and Budwieser.

I think I need to work with the 2 blade more. Sam is jumping out of his skin excited for race weekend. I also have a 3.5 seaducer he is going to race.

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RE: AquaCraft U-18 Miss Vegas Hydro Thread_Make it Fast! - 8/3/2006 8:23 PM

Jerry Dunlap

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Just returned from running a new yellow Miss Vegas . Ran the strut depth and angle as set by the factory - 1 1/8" deep. After running three tanks of 20% O'Donnell's through the engine with the black prop, I began trying some of my modified props. I tried three - a Y535 cut to look like a M series, a X637 reduced to 35 mm diameter, and a X438 reduced to 35 mm diameter and some of the blade contour removed. The blade appears flat rather than curved. That prop worked the best. All it takes to run props with a 3/16" shaft diameter on the 1/8" Miss Vegas shaft is a piece of brass tube that slips inside the 3/16" shaft diameter.

I plan to do more testing tomorrow. I'll bring my box of props for the Miss Vegas with me to Wichita.

I don't know what it is about this particular model, but after five runs there was hardly any water in the boat. I never drained it until after the fifth run.

JD
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RE: AquaCraft U-18 Miss Vegas Hydro Thread_Make it Fast! - 8/3/2006 8:44 PM

dirtysouth31

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okay might be a dumb question but where and how to remove head shims???

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RE: AquaCraft U-18 Miss Vegas Hydro Thread_Make it Fast! - 8/3/2006 8:48 PM

Jerry Dunlap

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quote:

ORIGINAL: dirtysouth31

okay might be a dumb question but where and how to remove head shims???

1. Remove the four screws holding the water cooled head to the case.
2. Remove the head from the case.
3. With something like a #11 Xacto blade, remove the shim from the top of the head.
4. Replace the head on the case and tighten the screws.

JD
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RE: AquaCraft U-18 Miss Vegas Hydro Thread_Make it Fast! - 8/3/2006 9:02 PM

piper_chuck

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quote:

ORIGINAL: Russ Williamson

First test runs with O.S. .21 VZM, sharpened Grim 15/18 turn fin, stock rudder and non-tuned strut (settings) radar was 44mph. (65% O'Donnell boat fuel)...

Jerry, Russ, and Grim, thanks for the feedback on the different engine choices. I'm trying to decide whether to go with the original engine, upgrade to a stronger .18, or just bite the bullet and turn it into a sport .21.

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RE: AquaCraft U-18 Miss Vegas Hydro Thread_Make it Fast! - 8/3/2006 9:55 PM

Bruce Frost

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The shim is the little brass peice in the groove of the head. Its so thin it doesn't look like it would do much but it does make a difference.

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RE: AquaCraft U-18 Miss Vegas Hydro Thread_Make it Fast! - 8/3/2006 10:04 PM

dirtysouth31

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on the bottom of cooling head right?just cut it out? wow i found all kinds of crap in there??was even a little pebble..is there any more mods for the engine that would make it better.i dont care about the warranty because i lost the receipt anyways

< Message edited by dirtysouth31 -- 8/3/2006 10:09 PM >

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