 |
MANUKAU MODEL POWER BOAT CLUB Inc
Web Site:
HTTP://homepages.paradise.net.nz/nickbree/mmpbc/
Venue: Wattle Farm Rd Pond Manurewa
2nd & 4th Sunday of each month from about 10.30 am
President: Malcolm Miller Editor Chris Breen
93 Sykes Rd 12 Sunset Rd
Manurewa Glenfield
Ph 268 2742 Ph 4445 482 May June 2003
HOT NEWS
 |
CLUB CHAMPS
Were held 24th – 25th May. Results below.
AGM
Was held 6th June 7:00pm Weymouth Cosmopolitan Club.
SUBSCRIPTIONS NOW PAYABLE
$30 Adult
$45 Family
$15 Junior (under 16)
Please send to
The Club Treasurer Maggie Burns
9 Domain Rd
Weymouth
POND EMPTY
The Council has drained the pond to carry out repairs to the perimeter banks. The pond may be empty for two weeks or longer. Opportunity to search for lost bits. Going by similar work underway here on the NorthShore it will probably be longer !! So count on no pond during June & check with Merv or Malcolm for update if you are planning a visit.
TECH NOTES
Mono Set-up Secrets PART 3
(Source June 1998 Roostertail ( USA model race boat newsletter)BY JOHN FINCH)
We talked about trim tabs in the first issue of the newsletter and then struts in the second issue. Now lets get into prop walk and add all three issues together for a smooth running Mono.
PROP WALK
Prop walk is the action that causes the model to veer to the right when at full speed. This is caused by the propeller dragging the transom to the left. The transom is dragged to the left because the prop, rotating in counter clockwise direction, tends to walk like a paddle wheel in that direction.
As a visual aid to understanding propwalk, visualize the propeller spinning counter clockwise as viewed from the rear of the boat. Draw a line from the left to right through the middle of the prop. The line divides the propeller into two halves; an upper half and a lower half. Blade movement on the upper half goes right to left. Prop blades on the lower half travel left to right. On a surface drive model the lower half of propeller rotation has a strong bite in solid water. The upper half, however, is partially above the water and has less bite in the water, so the prop paddle wheels to the left. With a subsurface setup, the strut blade can cause a stream of air bubbles to interfere with good prop bite in the upper half of rotation, which allows propwalk to run wild.
COMPENSATING FOR PROP WALK
 |
One way to compensate for prop walk is to bend the strut to the left, much like an outboard engine that is turned to the left to make the boat turn left. This method can cause other problems, though, so pay attention to detail. If your strut exits the boat dead center out of the transom, twisting the strut to the left will put the prop left of the centerline of the boat. The prop being to the left of the center of the boat may cause the boat to chine walks badly after the adjustment. Reason being, the prop lifts the left side of the boat more than the right side. With torque lifting the left side of the boat along with the prop being off center, the left side of the boat is lifted easily and can cause the boat to rock violently.
 |
A BETTER SOLUTION
The biggest cause of propwalk in a Mono is the strut blade. When water hits the strut blade, it is separated and runs on both sides of the strut blade. The problem is that it doesn't immediately blend back together after it passes the trailing edge of the strut blade. A trail of broken water leaves the strut blade but does not become a solid water mass for some distance. As I said earlier, the upper half of the prop rotation is located directly behind the strut blade and rides in the disturbed water flow.
The solution is to extend the strut hub far enough behind the strut blade so that water has time to join back together before entering the prop blades. I find that an inch is usually enough. This works with surface drive models too, because the new prop location far behind the transom of the boat puts the prop deeper into clean water. While the extended prop shaft length does allow more water to hit the top half of prop rotation, and the prop becomes more submerged, propwalk is reduced and increased speed is the result.
 |
An advantage is also seen in the extended prop shaft as the prop, when further from the transom, tends to keep the bow positioned without the need for radical trim tab adjustment. As the bow rises, the prop gets deeper in the water and pushes the bow back down into the water. That is top secret info!!!!! If you get the distance just right, it takes less trim tab to keep a fast boat on the water. I have found that three to four inches work best for me, depending on the model. If you get the prop too far behind the transom you will know it, because the boat will hop, especially in the corners.
In an earlier issue I said that I prefer a strut angle that is parallel to the keel, and that is a good benchmark for most boats, If however, you have a surface drive model that is really hauling the freight, some negative angle and a long strut hub will give you the control you need to drive in the 55 MPH range with full control.
A combination of slight strut twist and an elongated strut hub used together will sometimes give the best mix in compensation for prop walk. If you plan on twisting the strut, build the stuffing tube so that it exits just to the right of the centerline at the transom, so that when you bend the strut to the left, the prop ends up dead center on the centerline of the boat. Good luck in taming that wild beast we call a Mono!
(Editor’s note – that was the third & final part )
 |
Pipe Couplers
The following (edited ) discussion from RCBOAT.COM is interesting….
Can someone recommend the best tune pipe coupler and where I can buy it.
Don't know about the best you can buy but I've had good luck with aerotrend blue. The cream is supposed to be higher temp but I find that the blue is stiffer and last long enough for me.
While we are on the subject, what type of clamps does everyone use?
Nylon Tie-wraps. Cheap and hold great.
The teflon coupling will last longer than any other type of coupler. You don't really need to clamp it because it's rigid.
If you are using a 180 degree header, the GS J couplers hold up well and do not slip off like a straight coupler. I like using .041 stainless safety wire to clamp it down because it will not loosen up when it gets hot.
You can get the teflon from RocketCity, the GS from any RC car shop and the safety wire and pliers from MSC Supply.
Yup, Aerotrend blue coupler w/zip ties.
 |
White or black zip ties....any difference in this application? Do you change them every run?
general silicones are the best on the market. 5 bucks for 2 at any hobby shop
You can get a peice of Teflon coupler for around $7.00
I have used the same peice on a boat for a whole season with no problems.
I have had a hard time finding the teflon coupler material to fit the 45 pipe/headers, and have been using the Tidewater Clear coupler material on my 45's. It seems to hold up really well.
If you can get the right size Teflon for your application, do it.. You wont be disappointed.
You may think ty-wraps work... nope. On the test stand we saw them go very loose when hot and as it cools off the thing will appear to have been working fine.. NOT. We use the nylon clamps that have teeth on the inside of em.. They will not go loose when hot. I have no clue where they came from but have had sets of these things for years and once in a blue moon one will melt.. very rarely..
the nylon clamps are a General Motors invention to replace the steel hose clamps, Prather had them years ago, octura has tuned pipe connector material and clamps....holds up well as long as you have some air flow arround the TC
I think Seaducer sells the Teflon couplers. I used one on my 45. I had a 1/2 gap between the header and pipe. Took 2 years for it to finally break. Great stuff. I will never go back to Silicone. The only disadvantage is that it,s rock hard and needs to be heated with a torch to soften it up to go over the pipe and header. Once on, it is going no where. No need for clamps or tie wraps.
 |
In my area the aerotrend is a waist of money. The Octura works best for us as far as silicone goes. Once you get your correct pipe length get the Teflon.
We use the nylon clamps that have teeth on the inside of em.. They will not go loose when hot. I have no clue where they came from but have had sets of these things for years and once in a blue moon one will melt.. very rarely.. [/quote]
Check your local yellow pages for companies that sell agricultural sprayer parts and equipment. Have bought them for as little as 25 cents.
Aerotrend makes them. They have sizes for fuel lines and up to large pipe couplers.
I've tried the General Silicones and didn't like them, they flaked apart on the inside. I got some of the Teflon couplers from Tony Jacuzzi, I haven't had much of a chance to try it out yet.
I use Zip ties also, they are available in a variety of colors to match your boat or you can dye them to any color that you want.
Racing at the Club Champs/SUHA SEAFAIR Meeting (24/25 May)
Saturday started for us at 7.30am down at the ponds setting up the course and the putting up the tents that Graham and Wayne kindly arranged for us as the weather forecast didn’t look to bright for the weekend. With every one buckling in we had the course set, tents up and most of the boats scrutineered by 9am. We had a few entries from other Clubs but late withdrawals left only Paul from Taranaki and Steve from Tauranga ready to take on the local boys from Auckland. A few other boaties came from down the line and members were hoping that they might have bought their boats with them, even just for the endurance racing but unfortunately, they did not, maybe next time!
Unbelievably, there was no wind, the water was fairly still, which unfortunately left the odd piece of floating debris around the course that the breeze normally blows to the side of the pond and this did play havoc on a few boats water pickups during the course of both days. These conditions stayed pretty much like this most of the day and with just the odd sprinkling of showers in the morning.
 |
First race up was the 1/8ths Scale Hydroplanes and Merv with MISS BUDWEISER was the first casualty of a blocked water pickup and did not finish the first heat, though he did blitz the field and finished the next four heats in first place. Paul Garner driving AMERICAN SPEEDY PRINTING improved in every heat and by the take-all final had his boat really sorted out. Malcolm showed the he could be up with the front-runners with MILLER HIGH LIFE but with the extra chop caused by the other boats found his boat on the ragged edge frequently and had to back off to finish the heats. The final was exciting with all the boats except MISS BUDWEISER entering the water before the 30-second cut-off time but Merv decided to carry on to entertain the crowd and disqualified himself after the finish. Five boats started the Final with Chris and Mr Pringles electing not to race (radio problems).
The racing was exciting with Paul, Malcolm, Terry (ULTRA BOLD & DASH) and Steve with EXECUTONE pretty well on the button for the start and Merv having to play catch up. Malcolm and Steve both stopped and Merv passed Paul on the home straight of the last lap to take first, and then promptly dunked the BUDWEISER in a hole at the top bend. Following Paul home was Terry who had ran constantly all day and was the only boat to finish five heats and the Final. Congratulations to Paul in winning the SEAFAIR TROPHY and I believe with his first win in 1/8th Scale Hydroplane racing.
THE SUHA SEAFAIR TROPHY HI-POINTS
|
Paul Garner |
1830 |
AMERICAN SPEEDY PRINTING |
|
Merv Sowden |
1623 |
MISS BUDWEISER |
|
Terry Wilson |
1274 |
ULTRA BOLD & DASH |
|
Malcolm Miller |
1190 |
MILLER HIGH LIFE U00 |
|
Steve Trott |
600 |
EXECUTONE |
|
Chris Breen |
225 |
PRINGLES |
|
Jason Lester |
13 |
WINSTON EAGLE |
Next up we had Class I Sprint Racing with 8 entries. Wayne (SCARAB) had handling problems and Graham (OHIO STEEL) had blocked water pickup problem that put them off the pace for a heat or two. Chris in OS powered L & P ran consistently picking up three firsts and one second place. Dean (ROMPA STOMPA) started well but had cable problems and could not complete the last two heats. Malcolm (SKULDUGGERY) pulled all the stops out and showed the crowd what his very fast Deep Vee could do and was constantly pulling over 80 KPH. Bruce (VICTORY) was having a start-stop problem with his boat and Brent was some where in Cambridge looking for a servo! Points for Day one are Chris 39, Wayne 36, Graham 26, Dean 29, Malcolm 18 and Bruce 8.
One lap Sprints for 1/8ths and Class I followed:
1st Miller High Life 16.78 1st Skulduggery 18.13
2nd American Speedy 18.22 2nd Rompa 20.16
3rd Budweiser 19.32 3rd Ohio Steel 23.31
4th Ultra Bold & Dash 22.41 4th Scarab 24.87
5th Winston Eagle 31.00
6th Executone DNF
Class II Sprint racing followed with Jason (COCA COLA), Bruce (HERE’S TROUBLE) and Tony (TERMINATOR) having their share of wins and after the first days racing ending up with these following points, Jason 29, Bruce 28 and Tony 26pts.
In the Endurance Racing, there were three races, two on Saturday. One 10 minute M course clockwise, 20 minute M course anticlockwise and on the Sunday a 30 minute M course Clockwise. At the end of the day, points from both Saturday and Sundays races were to be accumulated in both the sprint racing as well as the endurance races for Class I & II.
In the Class I 10 minute endurance, we had Dean (DRAGO II) competing 22 laps, Wayne 21, Graham 20, Bruce 3 and Malcolm 2 laps. In the 20 minute anticlockwise Wayne did 41 laps, Graham 37, Malcolm 26, Dean 21 and Bruce 17 laps.
Class II 10 minute Bruce did 18 laps, Tony 15 laps and Jason had problems with COCA COLA and did not start. In the 20 minute anticlockwise, only Bruce started and clocked up 28 laps.
Well that was the racing for Saturday roll on Sunday……………..
SUNDAY
We were greeted with an overcast day, no rain, no wind and very flat water. Again all the pit work, tents erected and most boats scrutineered by 9am.
First up was the Scale 45 with originally seven entries but two withdrawals earlier on in the week bought it down to five boats. During practice, Chris found that the extra power in his new motor ripped the bottom out of BLACKFIRE right were his radio box is and flooded the electronics putting him out for the rest of the day. Steve Trott did not turn up and this left us with only three Scale 45’s. Merv had problems with RADICAL RAT and this left Jason (POSEIDON) and Paul (ANNIHILATOR) to fight it out with Jason just nudging out Paul in the heats by 100 pts. The Final had the three boats running and Paul pulled off a double victory in taking out the Scale 45 to go with the Seafair Trophy he won the day before. Jason came in second followed in the distance by Merv.
Class I Sprint Racing was the next race and with eight entries and this was going to be exciting racing. Brent (back from Cambridge) took the top honours for the day with four first and a second giving him 49pts. Graham had 34pts, Dean 19, Merv and Chris 18pts each and Malcolm with 9 pts. Bruce retired Victory and Wayne did a major in burning out an o-ring in his exhaust. This gave Graham the overall victory with a total of 60 pts for both days
One lap Sprints for Scale 45 and Class II followed:
1st Annihilator 18.96 1st Terminator 21.00
2nd Poseidon 19.41 2nd Here’s Trouble 22.72
3rd Budweiser 19.32 3rd Coca Cola 23.65
Class II Sprint Racing followed with Jason taking COCA COLA to four heat wins and one second place giving him 49 pts. Tony followed on 35 pts and Bruce on 18pts. This gave Jason an overall total of 59 pts in taking out the Class II sprints.
Two races to go and next was Class I Endurance with a 30 minute race ran clockwise. Malcolm withdrew and this left us with five starters. Brent again showed his pace and finished with 66 laps, Dean 46, Wayne 33, Graham 31 and Bruce with 8 laps. This gave Wayne 95 laps overall to take Class I endurance.
The final race of the day was the 30-minute Class II Endurance with Tony clocking up 49 laps, Jason 43 and Bruce with 18 laps. This gave Tony and Bruce 64 laps each for both days and took out the honours in Class II Endurance.
Congratulations to all the winners and from the reports I heard during the tidy up sounds like everybody had a great time. The successes of this regatta could not have happened without the help of everyone chipping in with the setting up and dismantling of the pits, tents, racecourse etc and a big thanks to Margaret for the BBQ on both days. Thanks to Scott Woodham and Gordon Sowden for taking the videos and a copy of both days racing can be obtained from Merv Sowden.
Thanks Guys and Girls!
 |
Club Champ Points 2003
1/8th ScaleTrophy by Merv Sowden
1st Miss Budweiser 1623pts
2nd Ultra Bold and Dash 1274pts
3rd Miller High Life 1190pts
4th Mr Pringles 225pts
5th Winston Eagle 13pts
Scale 45 Trophy by Dean Harris
1st Poseidon 1830pts
2nd Radical Rat II 525pts
Class II Sprints Trophy by Burns Family
1st Coca Cola 59pts
2nd Terminator 43pts
3rd Here’s trouble 37pts
Class I Sprints Trophy by Dean Harris
1st Ohio Steel 60pts
2nd L & P 57pts
3rd Ballistics 49pts
4th Rompa Stompa 48pts
5th Scarab 36pts
6th Skulduggery 27pts
7th Express 18pts
8th Victory 8pts
Class II 1 Lap Sprints Trophy by ???
1st Terminator 21.00
2nd Here’s Trouble 22.72
3rd Coca Cola 23.65
 |
Class I 1 Lap Sprints Trophy by ???
1st Skulduggery 18.13
2nd Rompa 20.16
3rd Ohio Steel 23.31
4th Scarab 24.87
Class II 1 Enduro Trophy by Kockett Family
1st Terminator 64 laps
1st Here’s Trouble 64 laps
3rd Coca Cola 43 Laps
Class I Enduro Trophy by Kockett Family
1st Scarab 95 laps
2nd Drago II 89 laps
3rd Ohio Steel 88 laps
4th Ballistics 66 laps
5th Victory 28 laps
5th Skulduggery 28 laps
Club H i- Points Standings
Sprint Racing
|
Driver |
Boat |
Trophies Donated by |
Total Sprint Points |
Sprint |
Class I Off-Shore |
|
Malcolm Miller |
|
Malcolm Miller |
Skulduggery |
|
302 |
|
Brent Harrison |
Ballistics |
|
241 |
|
Chris Breen |
Lemon & Paeroa |
|
208 |
|
Adrian Milanesi |
Lamborghini |
|
206 |
|
Graham Doggett |
Ohio Steel |
|
192 |
|
Dean Harris |
Rompa Stompa |
|
135 |
|
Wayne Lester |
Scarab |
|
100 |
|
Glen Sayers |
Blue Dealer |
|
92 |
|
Bruce Burns |
Victory |
|
91 |
|
Merv Sowden |
Express |
|
77 |
|
Tony Belle |
Exciter |
|
71 |
|
Dean Harris |
Drago II |
|
65 |
|
Jason Lester |
Coca Cola |
|
54 |
|
Phil Leach |
PSL Construction |
|
39 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Sprint |
Class II Off-Shore |
|
??? |
|
Jason Lester |
Coca Cola |
|
120 |
|
Tony Kockett |
Spyder |
|
113 |
|
Bruce Burns |
Reactor |
|
62 |
|
Peter Wright |
Obsession |
|
51 |
|
Jason Lester |
Bud Dry |
|
29 |
|
Bruce Burns |
Red Devil |
|
28 |
|
Glen Sayers |
Steves Model Shop |
|
18 |
|
Bruce Burns |
Ally |
|
8 |
|
|
|
|
|
Club Points Standings
Endurance Racing
|
Driver |
Boat |
Total Enduro Points) |
Trophies Donated by |
|
Enduro |
Class I Off-Shore |
|
Graham Doggett |
|
Malcolm Miller |
Skulduggery |
113 |
|
|
Brent Harrison |
Ballastics |
79 |
|
|
Dean Harris |
Drago II |
77 |
|
|
Graham Doggett |
Ohio Steel |
59 |
|
|
Tony Belle |
Exciter |
49 |
|
|
Adrian Milanesi |
Lamborghini |
42 |
|
|
Bruce Burns |
Victory |
22 |
|
|
Jason Lester |
Coca Cola |
14 |
|
|
Chris Breen |
L & P |
13 |
|
|
Phil Leach |
Twin |
8 |
|
|
Wayne Lester |
Scarab |
7 |
|
|
Phil Leach |
PSL Construction |
4 |
|
|
|
|
|
|
|
|
|
|
|
|
Enduro |
Class II Off-Shore |
|
??? |
|
Jason Lester |
Coca Cola |
40 |
|
|
Tony Kockott |
Spyder |
24 |
|
|
Jason Lester |
Bud Dry |
10 |
|
|
|
|
|
|
|
|
|
|
|
|
1/8th Scale |
Hydros |
|
??? |
|
Merv Sowden |
Miss Budweiser |
|
256 |
|
Malcolm Miller |
Miller High Life |
|
187 |
|
Chris Breen |
Llumar Window & Film |
|
178 |
|
Glen Sayers |
York International |
|
145 |
|
Jason Lester |
Winstone Eagle |
|
31 |
|
Terry Wilson |
Ultra Bold and Dash |
|
27 |
|
|
|
|
|
|
Scale 45 |
Hydros |
|
??? |
|
Jason Lester |
Poisidon |
|
63 |
|
Chris Breen |
Black Fire |
|
59 |
|
Merv Sowden |
Radical Rat |
|
57 |
FOR SALE/WANTED COLUMN
For sale zenoha {daytona} with mounts, no pipe Next Race day is probably a write-off with no water
little used just run in, Next Testing day likewise
$350. firm Probably no water until July
ph Brett, 09 2678478 or 025888019 Chris Breen – Editor
F:\My Documents\CHUFFS\mmpbc\mayjune2003\mayjuner2003newsletter.doc