Get Adobe Flash player

 

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                  April 2003

 

HOT NEWS

 

Text Box:  

Class 1 Race in March

CLUB CHAMPS

Change the dates to 24th – 25th May due to Council not being able to guarantee water 10th – 11th May. Entry Forms should soon be on our web-site.

AGM

6th June 7:00pm Weymouth Cosmopolitan Club

Any remits for rule changes must be sent to in writing (E-MAIL) to the Club Secretary/Editor before the end of April so they can be published in the May Newsletter.

All club officer positions are up for election at the AGM so have a think about it.

POND EMPTY

The Council is again draining the pond to carry out repairs to the perimeter banks. They (or their contractor) expect to start Monday 7th April. The pond may be empty for two weeks or longer. Going by similar work underway here on the North Shore it will probably be longer !!   Opportunity to search for lost bits.

TECH NOTES

Text Box:  

Class II race

Mono Set-up Secrets PART 1

(Source March 1998 Roostertail ( USA model race boat newsletter)BY JOHN FINCH)

We talked about trim tabs in the last issue of the newsletter and how they affected the ride of a monohull. In this issue of MONO MANIA, I will elaborate on the strut and how it affects the ride of the boat. We already learned that we could compensate for torque roll by bending the right inside trim tab downward to shoot water off the bottom of the right side of the model. The downward stream of high speed water lifts the right side of the boat and fights the natural need for the model to roll to the right as viewed from the transom. Torque roll can also be adjusted out of a model by positioning the strut off center or by raising the strut.

TORQUE ROLL

Text Box:  

Further Class 1 racing

Monohulls tend to roll over to their right in a clockwise direction as viewed from the rear of the model. This is because the prop grabs water in a counter clockwise direction and the resulting action is that the engine, which is attached to the hull, is forced to rotate clockwise as the prop encounters the resistive force of the water.

To help fight torque, you can position the strut to the right of the keel. With the strut just a bit to the right of the keel, one eighth of an inch or so for example, the lifting action of the prop is distributed more to the right side of the model. The added lifting force on the right side of the model helps to deter the engines rotational force and reduces the amount of down trim tab adjustment that is needed on the fight inside tab for keeping the boat from leaning on it's side. That was a secret, so don't tell anyone!

 

 

SHAFT ANGLE

Text Box:  

The new Lester Class I

The angle of the strut up and down will determine if the bow rides light or wet. Negative angle, which angles the prop thrust cone downward, will cause the transom to be lifted and the bow to be forced downward. Kicking the strut back, so that prop blast is pointed up will cause the bow to ride light on the water. I recommend that the strut angle always be perfectly parallel with the keel or within two degrees of parallel. The reason is this: When the boat leaves the water during a race, the tabs will have no affect on keeping the boat from blowing off the water. If the angle of the strut is positive, the prop may push the boat into blowing off the water. If strut angle is negative, the bow will be pushed into the water and the boat may submarine. If the strut is parallel with the keel, the prop will push the boat straight and level until it settles back into the water. Of course this is assuming that the model is balanced aerodynamically with the proper center of gravity.

Another variable is strut depth. The deeper the strut is in the water, the more the boat is lifted out of the water. As the strut is made more shallow, the boat is allowed to settle into the water. Surface drive struts are popular because they allow the model to settle into the water. This helps to get the trim tabs into the water to stop chine walk.

Now you know how to fight the chine walk problem. We will talk about prop walk in the next issue, so stay tuned and read the Roostertail from front to back. An informed model boater is a better model boater.

(Editor’s note – third & final part next newsletter)

Epoxy Resin vs. Vinylesters and Polyesters

Here is some technical data that you may find interesting regarding the differences between Epoxy Resin and Vinylester or Poyester Resins. 

In the marine industry, liquid plastics, namely epoxies, polyesters, and vinylesters are used to saturate (wet out) the fibers of wood, glass, kevlar amarid, or carbon to form a fiber reinforced plastic (FRP).  To create a quality part, adhesion to the fibers is the most important factor.  Not all resins keep their grip on fibers equally.

Epoxy resin is known in the marine industry for its incredible toughness and bonding strength.  Quality epoxy resins stick to other materials with 2,000-p.s.i. vs. only 500-p.s.i. for vinylester resins and less for polyesters.  In areas that must be able to flex and strain WITH the fibers  without micro-fracturing, epoxy resins offer much greater capability. Cured epoxy tends to be very resistant to moisture absorption.  Epoxy resin will bond dissimilar or already-cured materials which makes repair work that is  very reliable and strong.  Epoxy actually bonds to all sorts of fibers very well and also offers excellent results in repair-ability when it is used to bond two different materials together.

Vinylester resins are stronger than polyester resins and cheaper than epoxy resins. Vinylester resins utilize a polyester resin type of cross-linking molecules in the bonding process.  Vinylester is a hybrid form of polyester resin which has been toughened with epoxy molecules within the main moleculer structure.  Vinyester resins offer better resistance to moisture absorption than polyester resins but it's downside is in the use of liquid styrene to thin it out (not good to breath that stuff) and its sensitivity to atmospheric moisture and temperature.  Sometimes it won't cure if the atmospheric conditions are not right.  It also has difficulty in bonding dissimilar and already-cured materials.  It is not unusual for repair patches on vinylester resin canoes to delaminate or peel off.   As vinylester resin ages, it becomes a different resin so new vinylester resin sometimes resists bonding to your older canoe. It is also known that vinylester resins bond very well to fiberglass, but offer a poor bond to kevlar and carbon fibers.  Due to the touchy nature of vinylester resin, careful surface preparation is necessary if reasonable adhesion is desired for any repair work. 

Polyester resin is the cheapest resin available in the marine industry and offers the poorest adhesion, has the highest water absorption, highest shrinkage, and high VOC's.  Polyester resin is only compatible with fiberglass fibers and is best suited to building things that are not weight sensitive.  It is also not tough and fractures easily. Polyesters tend to end up with micro-cracks and are tough to re-bond and suffer from osmotic blistering when untreated by an epoxy resin barrier to water.  This is really cheap stuff.

Summary - Epoxy resin has far more to offer in its ability to flex, prevent delamination, and ease of use for repairwork. Using epoxy resin leads to better quality products. 

Looking for a NEW MOTOR?

Text Box:  For the man who has everything.

Would not one of these babies look just amazing!

4.27 cubic inch (70 cc), about US$4000, (supercharger is extra).

You can see more at:
http://www.conleyprecision.com/prod01.htm

Racing in March

March was a reasonable turnout of members considering this was not our normal race day. Our normal race day was postponed due to lack of water. The weather was overcast with little wind and was ideal for the 1/8ths hydros. Chris took the honours for the day with Merv and Malcolm’s boats having a case of gremlins of one sort or another.

We had eight entries for Class I sprints and this bought out some exciting racing and LAMBORGHINI looked like it was going to be a threat with its superior speed easily winning the first heat. Unfortunately, in the third heat LAMBORGHINI took off and hit the water hard, splitting the side open and doing some deck damage putting it out for the rest of the day.

SKULDUGGERY and OHIO STEEL, both having been re-powered lately, are still fighting for supremacy for the fastest DV and no doubt, there will be some new mods done on both boats before the next round. Graham was the more consistent pulling of five-second places and one-third place, to take overall top honours for the day. BALLISTICS driven by Brent seemed to be slightly down on power but managed to finish all his heats as well and took out Second place. ROMPER STOMPER had a bad start with two DNF in the first two heats but once Dean calmed his nerves down, won the last four heats in a row, tying with Malcolm for third place.

BALLISTICS has claimed back 2nd place from LAMBORGHINI in the Hi points Series.

In Class II Sprints, we had four starters with SPYDER and COCA COLA having a great tussle over the four heats they raced. Prop changes and bits of tweaking were the duty of the day, trying to get that extra bit of edge, with Tony coming out on top and claiming top honours. Bruce was having problems with REACTOR being a little off tune, but seen so many times before, REACTOR came right after the racing was finished. OBSESSION is still having problems and Peter, seen to be carrying a bowl full of engine parts around and muttering something about next time it will be right!

Class I Endurance was ran clockwise, but as an “M” course with DRAGO II and OHIO STEEL fighting it out to the end with the lead changing several times. Graham took the lead from Dean on the penultimate lap and what a great race to watch. COCA COLA, a Class II boat took out third place, which was a great achievement, with BALLISTICS and SKULDUGGERY filling out the next two places. In the High Points DRAGO II has now moved up to within 1 point from BALLISTICS and with one more possible round of Club racing before our Club Champs, things are getting very exciting.

A great days racing, and a big thank you to those that came early to set up the Course and Pits, to Mrs Burns for the BBQ and to those who tidied up afterwards, it is very much appreciated.

Points

Class I Sprint Racing

 

40.85

Malcolm Miller

277

SKULDUGGERY

40.71

Brett Harrison

223

BALLISTICS

40.985

Adrian Milanesi

206

LAMBORGHINI

29.925

Chris Breen

193

L & P

27.145

Graham Doggett

175

OHIO STEEL

27.195

Dean Harris 2

115

ROMPER STOMPER

29.985

Wayne Lester

100

SCARAB

40.83

Glen Sayers

92

BLUE DEALER

27.225

Bruce Burns

91

VICTORY

40.79

Tony Belle

71

EXCITER

26.975

Dean Harris 1

65

DRAGO II

40.81

Merv Sowden

58

EXPRESS

40.97

Jason Lester

54

COCA COLA

27.175

Phillip Leach 1

39

PSL CONSTRUCTION

40.915

Tony Cockett

37

SPYDER

27.095

Peter Wright

31

OBSESSION

27.175

Phillip Leach 2

 

TWIN

Class I Endurance

   

40.85

Malcolm Miller

105

SKULDUGGERY

40.71

Brett Harrison

69

BALLISTICS

26.975

Dean Harris 1

68

DRAGO II

27.145

Graham Doggett

59

OHIO STEEL

40.79

Tony Belle

49

EXCITER

40.985

Adrian Milanesi

42

LAMBORGHINI

40.915

Tont Kockett

24

SPYDER

27.225

Bruce Burns

22

VICTORY

40.97

Jason Lester

14

COCA COLA

29.925

Chris Breen

13

L & P

27.175

Phillip Leach 2

8

TWIN

29.985

Wayne Lester

7

SCARAB

27.175

Phillip Leach 1

4

PSL CONSTRUCTION

Class II Sprint Racing

 

29.985

Jason Lester Coca

90

COCA COLA

40.915

Tony Cockett

76

SPYDER

29.745

Bruce Burns Reactor

62

REACTOR

29.985

Jason Lester Bud

29

BUD DRY

29.825

Bruce Burns Red

28

RED DEVIL

27.095

Peter Wright

20

OBSESSION

29.865

Glen Sayers

18

STEVES MODEL SHOP

29.825

Bruce Burns Ally

8

ALLY

Class II Enduro Racing

 

29.985

Jason Lester Coca

30

COCA COLA

29.985

Jason Lester Bud

10

BUD LIGHT

29.825

Bruce Burns

 

RED DEVIL

29.865

Glen Sayers

 

STEVES MODEL SHOP

27.095

Peter Wright

 

OBSESSION

1/8th Scale Hydro

 
 

Merv Sowden

209

MISS BUDWEISER

 

Chris Breen

170

LLUMAR WINDOW FILM

 

Malcolm Miller

148

MILLER HIGH LIFE U00

 

Glen Sayers

145

YORK

 

Jason Lester

31

WINSTONE EAGLE

 

Terry Wilson

27

ULTRA BOLD & DASH

       

FOR SALE/WANTED COLUMN

Hi, I am not as yet a member of your club as I have no boat yet, my next

question. Could you please put in an ad for a 1/8th scale hydro (turbine

model). It would be greatly appreciated.

Thanks

 

Rory Antony

This email address is being protected from spambots. You need JavaScript enabled to view it.

 

 

Next Race day April 13th is probably a write-off with no water

Next Testing day is April 27th (could also be off)

 

Chris Breen – Editor

F:\My Documents\CHUFFS\mmpbc\april2003\apr2003newsletter.doc


HIGH PERFORMANCE MODELS

8B Tamariki Ave, OREWA, Hibiscus Coast, New Zealand

PHONE/FAX: (09) 427-5878         EMAIL: This email address is being protected from spambots. You need JavaScript enabled to view it.

GST NO: 83-276-142

.CMB 21

21 EVO LS- GREEN HEAD                                $499.95

21 VALVOLA GEAR DRIVE- GREEN HEAD    $624.95

21 EVO II MARINE PIPE - SILENCED              $105.00

21 LS EX-HEADER WATER COOL                  $52.00

21 VALVOLA EX-HEADER W/C              $52.00

CMB 67

67 GPE -PURPLE HEAD                                  $649.95

67/80 H-RACING (CAM) - GREEN HEAD       $639.95

67 STD MARINE PIPE - SILENCED$105.00

67 STD HEADER                                                 $47.25

CMB 45 EVO 2/2

45 EVO 2/2 GEAR DRIVE- PURPLE HEAD   $644.95

45 EVO 2/2 DIRECT DRIVE- PURPLE HEAD$639.95

45 EVO II MARINE PIPE - SILENCED              $115.00

45 EVO II WATER COOLED EX-HEADER      $57.00

45 EVO II STANDARD EX-HEADER$47.25

CMB 90

90 EVO 2000 - PURPLE HEAD                        $759.00

90 EVO II PIPE - SILENCED                              $137.00

90 SMALL PIPE - SILENCED                            $142.00

90 EX- HEADER WATER COOLED                 $75.00

90 EX-HEADER SMALL WATER COOLED     $66.50

All the CMB EVO engines come standard with a full r/c carb. CAM motors have hydro carb.

OCTURA

STRUTS AND STRUDDERS

OC8STR-Q              STRUDDER PACKAGE .250 SQD                            $245.00

OCSTRUDM             STRUDDER M                                                          $83.50

OCSSSLBO             STAINLESS STEEL STRUT LARGE W/SKEG           $77.50

OC6WRL                 LARGE WEDGE RUDDER ASSEMBLY                    $43.50

CABLE

OC6SQL-24A          24” .187 CABLE LEFT ONE END SQ                        $18.75

OC8SQL-24A          24” .250 CABLE LEFT ONE END SQ                        $20.75

OC187T-240                            12” .187 TEFLON TUBING                       $3.50

OC250T-240                            12” .250 TEFLON TUBING                       $6.30

SHAFTS, BEARINGS, THRUST WASHERS, FLEX FERULES

OC6LTSB                LEAD TEFLON BEARING 3/16”                                $14.50

OC8LTSB                LEAD TEFLON BEARING ¼”                                    $22.50

OC8TW                    THRUST WASHER ¼” ID                                         $5.95

OC6DM                    DRIVE DOG 3/16”ID 3/8”OD                                     $7.50

OC8D                       DRIVE DOG ¼”ID ½” OD                                         $7.75

OC6PS                     PROP SHAFT WITH OC6D                                       $10.75

OC8PS                     PROP SHAFT WITH DRIVE DOG                              $26.50

OCFSF1818             FLEX FERULE.187 - .187 1/16 OD                           $9.25

OCFSF2518             FLEX FERULE .250 - .187 7/16 OD                          $9.50

OCFSF916               FLEX FERULE .250 - .250 9/16 OD                          $9.75

OCFH0656Q            FLEX HEX 6MM SQR                                               $25.50

OC68RB                  PROP REDUCER BUSHING FOR .25 DIA  $3.90

PROPELLORS

X440                                       $35.95

X640                                       $35.95

X642                                       $36.20

X447                                       $36.20

X450                                       $38.65

X452                                       $39.25

X457                                       $43.75

X462                                       $43.90

X465                                       $47.25

X447/3                                   $45.90

X450/3                                   $46.80

X452/3                                   $46.80

X455/3                                   $47.95

X457/3                                   $47.95

X460/3                                   $50.75

REV COUNTER                         $120.00

Measure the rpm of a direct drive or geared engine. Kit includes: Tacho unit, one pickup cable, mains charger, magnet and aluminium carrier. Mode 1 allows the highest rpm reading on a run to be held. Mode 2 remembers the average rpm. The tacho reads from a magnet, which can be fixed to the propshaft by an aluminium carrier, or from a magnet fitted to the engine flywheel. 45mmx30mmx15mm

APRIL SPECIALS - FUTABA RADIO’s

2ER27/29 Attack           2 Channel Stick Radio                $135.00

2PHKA 27                     2 Channel Wheel Radio              $195.00

3PJ27                           3 Channel PCM Wheel Radio      $999.00

4VF40                           4 Channel Stick radio FM           $339.00

PLUGS

McCOY 9                                 $9.50

McCOY59                               $9.50

McCOY 8                                 $9.20

CMB C7S                                $12.00

CMB C7C   (CONE PLUG)         $12.00

ALL PRICES INCLUDE GST. POSTAGE EXTRA. PRICES MAY FLUCTUATE DUE TO EXCHANGE RATES