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MANUKAU MODEL POWER BOAT CLUB Inc

 

Web Sites:

HTTP://www.voyager.co.nz/~gasayers

HTTP://homepages.paradise.net.nz/nickbree/mmpbc/

Venue: Wattle Farm Rd Pond Manurewa

2nd &  4th Sunday of each month

 

Secretary:        Glen Sayers                 Editor   Chris Breen

                        9 Reyland Close                       86 Chivalry Rd

                        Manurewa                               Glenfield

                        Ph 267 2607                              Ph 4445 482                              September 2001

 

HOT NEWS

New Zealand Speed Records

 

Last month we reported Tony Rutledge’s record run of 131.387 kph in his C2 Hydro in the South Island.

 

It is worth noting that this record was achieved using plain methanol and castor  ie NO NITRO !!!

Overseas it is common to find very high nitro mix fuels in use, so compare speed reports with caution.

 

GPS Speed Trials

 

At one of our Auckland meetings during August Chris ran a few trials using a small Garmin GPS unit.  Fitting the unit into V bottom and cat hulls looks to be straight-forward and the results were encouraging.    Speeds obtained appeared very reliable.  We obtained 55 kph on Chris’ new cat L&P (Jason to note: Speeds now MUCH higher having fitted a proper size tuned pipe),  and 74 kph on the 1/8th scale Llumar. 

 

We will be pursued the idea further once we figure out a safe way to attach the unit to a hydro ! In Llumar the unit touched the pipe and burned a hole in the plastic bag and sponge wrap !!

 

There has been some discussion on the web about GPS units and their accuracy.  The facts are these:

 

Units calculate position at intervals of 1 to 2 seconds.

Calculated position accuracy is VERY accurate, the common, hand held units calculate to 1/10 of one second in latitude and longitude, that is 3 metres.  The well known accuracy problem relates to the accuracy of the satellite datum and its error in relation to true position.  This datum says constant over short periods of time, so distance travelled over those 1 to 2 seconds is very accurate.  You do need to hold a straight line for those 1 or 2 seconds though!

 

For those that still don’t believe, know this, much surveying done nowadays is done using GPS technology.

 

TECH NOTES

The following debate from the www.rcboat.com  discussion room makes interesting reading.

To Polish or Not to Polish props

 

I polished the prop I ran last year on my 1/8 scale hydro when I put the boat into the Toledo show. When I went to run the boat, it wouldn't even get up on plane. I took a brand new prop and just sharpened and balanced it, put it on the boat and it got onto plane. On my full size drag boat, I run a $ 1000 stainless propand the face of it looks as if it has been shot with a pellet gun. I guess this substantiates my theory about not polishing the face of a prop.

Mike_Hallam (USA)

 

I found the same thing in almost the same exact way as Mike and it was surely by accident. I had two exactly matched ABC 52 X 70 props. One was polished and one had our "satin" finish. I had never run these props on anything and they had been kicking around in my prop box for some time. One day we went out with our newly modified Sport 40 hydro and in looking through the prop box I felt the 52 X 70 (satin finish) would be a good place to start.

 

We ran the boat 3 - 4 times with a little strut and pipe adjusting between each run.  Every time the boat would jump right up on plane and the speed was good but I felt we could pull a little more prop. I wanted to keep the first prop as a bench mark so I removed it and after adding a very small amount of cup to the polished prop I put in on the boat. Upon launching the prop cavitated badly and never got the boat on plane. At first we thought it was just a bad launch. The next good launch produced the same results. To give it one more chance I gave it a 100 mph launch and it did get on plane but after a few laps it was apparent that the speed was off several mph. To make sure we could believe our eyes we put the "satin prop back on and away it went.

Haven't run a polished prop since.

Andy Brown (USA)

 

 

Final Round of the Northern Handicap Series ( Auckland) 19 August

The final round of the series took place in Auckland with reasonable weather (for a change).  We had a good tun out with 13 boats although Malcolm pulled out and did not race (Editor’s note: He could afford not to race – See results)

 

Boats were split into 2 groups of 7 and 5, and 5 heats run with few problems except the odd minor bump and conk-out. 

 

 

One noticeable observation was that the faster group of 7 boats did seem to be more reliable with only 5 DNFs over the 5 heats.  The second group of 5 boats had 9 DNFs.

 

 

It was good to se several visitors from down Country.  Thanks for coming guys, you are always welcome at any of our club days.

 

 

 

 

 

 

 


Handicap Racing Series Results

 

 

 

 

 

Name

Round 1

Round 2

Round 3

Round 4

Zone

Total

1

Daryl Christensen

621.34

1485.24

1679.1

1581.93

Southern

4746.27

2

Nigel Bunn

986.1

1596.63

1375.13

1564.4

Northern

4536.16

3

Neil Plumpton

1531.67

1489.14

1313.09

1473

Southern

4493.81

4

Tony Rutledge

1596.26

1316.12

1288.84

1462.15

Southern

4374.53

5

Malcolm Miller

1408.95

1501.66

1316.79

0

Northern

4227.4

6

Mark Graham

1646.19

1129.01

1223.15

897.74

Southern

3998.35

7

Jeff Weake

1140.6

550.37

1123.11

1404

Northern

3667.71

8

Elvis McNaught

0

1523.08

1518.15

608.5

Southern

3649.73

9

Don Ward

1218.32

1216.02

0

1171.67

Southern

3606.01

10

Chris Breen

1236.61

1191.6

620.95

1172.4

Northern

3600.61

11

Peter Collier

1305.44

1224.41

1015.21

0

Southern

3545.06

12

Tony Belle

0

1424.53

883.7

1117

Northern

3425.23

13

Grant Binns

1253.33

762.3

1245.31

837.15

Southern

3335.79

14

John Belworthy

303.31

1424.09

0

1559.07

Southern

3286.47

15

Greg Clarkson

1393.07

1621.91

0

0

Northern

3014.98

16

Graham Merry

1445.47

1357.37

0

0

Southern

2802.84

17

Jason Lester

1439.92

0

0

1038

Northern

2477.92

18

Wayne Lester

1437.89

0

0

960.4

Northern

2398.29

19

Birmy Korving

0

0

1118.42

1184.8

Northern

2303.22

20

Peter Wright

0

576.77

0

1548

Northern

2124.77

21

Graeme dePina

724.64

0

0

834

Northern

1558.64

22

Adrian Millanessi

0

1230.5

250

0

Northern

1480.5

23

Michael Binns

1451.32

0

0

0

Southern

1451.32

24

Graham Doggett

0

0

0

1353

Northern

1353

25

Dallas Gibson

0

0

972.79

0

Northern

972.79

26

Michael Hall

0

 

 

843.64

Southern

843.64

27

Stanley Shrimpton

0

0

792.16

0

Northern

792.16

28

Peter Hall

0

 

 

484.73

Southern

484.73

29

Phil Attenborough

0

0

0

401.4

Northern

401.4

30

Brian Nesbitt

0

0

348

0

Northern

348

 

Hydro Regatta

Your Editor throw out a challenge to the owners of 1/8th scale and Sport 40 hydros in our last newsletter. 

 

To date Glen has re-surfaced with York and Winston Eagle, and Merv is sorting out an mean looking Sport 4 stealth machine!!  More are still to appear I am told.

 

NEW Boats:

Apart from Merv’s new sport 40 above,  Wayne appeared at a recent meeting with his new 20 size mono “Penzoil”   

 

Well that is all for this newsletter people – Next Club Race Day is September 9th

 

C Breen – Editor

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