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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
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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.
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Handicap Racing Series Results |
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Name |
Round 1 |
Round 2 |
Round 3 |
Round 4 |
Zone |
Total |
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1 |
Daryl Christensen |
621.34 |
1485.24 |
1679.1 |
1581.93 |
Southern |
4746.27 |
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2 |
Nigel Bunn |
986.1 |
1596.63 |
1375.13 |
1564.4 |
Northern |
4536.16 |
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3 |
Neil Plumpton |
1531.67 |
1489.14 |
1313.09 |
1473 |
Southern |
4493.81 |
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4 |
Tony Rutledge |
1596.26 |
1316.12 |
1288.84 |
1462.15 |
Southern |
4374.53 |
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5 |
Malcolm Miller |
1408.95 |
1501.66 |
1316.79 |
0 |
Northern |
4227.4 |
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6 |
Mark Graham |
1646.19 |
1129.01 |
1223.15 |
897.74 |
Southern |
3998.35 |
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7 |
Jeff Weake |
1140.6 |
550.37 |
1123.11 |
1404 |
Northern |
3667.71 |
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8 |
Elvis McNaught |
0 |
1523.08 |
1518.15 |
608.5 |
Southern |
3649.73 |
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9 |
Don Ward |
1218.32 |
1216.02 |
0 |
1171.67 |
Southern |
3606.01 |
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10 |
Chris Breen |
1236.61 |
1191.6 |
620.95 |
1172.4 |
Northern |
3600.61 |
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11 |
Peter Collier |
1305.44 |
1224.41 |
1015.21 |
0 |
Southern |
3545.06 |
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12 |
Tony Belle |
0 |
1424.53 |
883.7 |
1117 |
Northern |
3425.23 |
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13 |
Grant Binns |
1253.33 |
762.3 |
1245.31 |
837.15 |
Southern |
3335.79 |
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14 |
John Belworthy |
303.31 |
1424.09 |
0 |
1559.07 |
Southern |
3286.47 |
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15 |
Greg Clarkson |
1393.07 |
1621.91 |
0 |
0 |
Northern |
3014.98 |
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16 |
Graham Merry |
1445.47 |
1357.37 |
0 |
0 |
Southern |
2802.84 |
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17 |
Jason Lester |
1439.92 |
0 |
0 |
1038 |
Northern |
2477.92 |
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18 |
Wayne Lester |
1437.89 |
0 |
0 |
960.4 |
Northern |
2398.29 |
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19 |
Birmy Korving |
0 |
0 |
1118.42 |
1184.8 |
Northern |
2303.22 |
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20 |
Peter Wright |
0 |
576.77 |
0 |
1548 |
Northern |
2124.77 |
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21 |
Graeme dePina |
724.64 |
0 |
0 |
834 |
Northern |
1558.64 |
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22 |
Adrian Millanessi |
0 |
1230.5 |
250 |
0 |
Northern |
1480.5 |
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23 |
Michael Binns |
1451.32 |
0 |
0 |
0 |
Southern |
1451.32 |
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24 |
Graham Doggett |
0 |
0 |
0 |
1353 |
Northern |
1353 |
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25 |
Dallas Gibson |
0 |
0 |
972.79 |
0 |
Northern |
972.79 |
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26 |
Michael Hall |
0 |
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843.64 |
Southern |
843.64 |
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27 |
Stanley Shrimpton |
0 |
0 |
792.16 |
0 |
Northern |
792.16 |
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28 |
Peter Hall |
0 |
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484.73 |
Southern |
484.73 |
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29 |
Phil Attenborough |
0 |
0 |
0 |
401.4 |
Northern |
401.4 |
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30 |
Brian Nesbitt |
0 |
0 |
348 |
0 |
Northern |
348 |
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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:
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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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