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MANUKAU MODEL POWER BOAT CLUB Inc
Web Sites:
HTTP://www.voyager.co.nz/~gasayers
HTTP://homepages.ihug.co.nz/~cbreen/mmpbc/frames.html
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 444 5482 July 2001
HOT NEWS
SPEED RUNS
Speed runs at Lake Hakanugha, (Huntly) still planned shortly, but no further news at present.
100 MINUTE OFFSHORE
Date for 100 minute offshore is 26 August. We generally run 2 x 50 minute
heats and break the entries up into as many groups as is necessary. The
course layout is decided on the day to suit the weather conditions. Rest of
rules are per rule book.
NZMPBA RULE BOOKS
NZMPBA have just printed off a few more rule books so it any of you guys need one, get in touch with Grahame Haines (130 Maxwell Rd Blenheim Ph 03 577 5124)
CLUB RACE DAY on 8 July 2001-07-12
Last race day saw about 7 or 8 boats turned up including Chris’ new OS61 powered offshore cat for its first test run. Still in undercoat grey, temporary pipe and no top as yet. Watch out Jason….
Regrettably there was only a single hydro so we only ran 6 offshore heats. Malcolm and Adrian dominated with Malcolm running “Skulduggery” and Adrian running his orange and white cat.
Other competitors were Brian with “Pussycat”, Tony and Peter with sprint cats, and our new member Russell with a crackerbox.
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Minutes of Club Meeting 24 June 2001
About 15 members present (plus rain)
1) Merv to pick up Driver’s Stand matter with the council once Ralph has brought papers around to him, and financial position of club understood.
2) Club Champs to be later in year to allow boats currently under construction to be finished & tuned up. Weather is also more reliable later in the year.
3) Jason raised issue of double points for final race of the day. After some discussion double points confirmed by narrow margin (4 to 3 plus 8 non-votes or thereabouts)
4)Non-financial members to PAY UP at the next race day meeting (8 July)
Money to go to Wayne if Glen not in attendance)
5) Hamilton to hold 100 minute Enduro in near future. Chris to obtain rules & circulate
6) Next Handicap meeting at Hamilton on 22 July from about 8.30 am. NOTE THESE REGATTAS ALSO COUNT FOR OUR OWN CLUB POINTS CHAMPIONSHIP
CB
Editor and minute taker
Regional Handicap Series
NEXT ROUND IS HAMILTON ON 22 July 2001 from around 8.30 am. We plan to award credit for these regattas in our own club points competition and when our editor receives the individual placing information he will add appropriate points into the table at the end of this newsletter.
National Points to Date: (2) = score after two regattas
Mark Graham 1646.19 Tony Rutledge 1596.26 Neil Plumpton 1531.67
Michael Binns 1451.32 Graeme Merry 1445.47 Jason Lester 1439.92
Wayne Lester 1437.89 Malcolm Miller(2) 2910.61 Greg Clarkson(2) 3014.98
Peter Collier 1305.44 Grant Binns 1253.33 Chris Breen(2) 2428.21
Don Ward 1218.32 Jeff Weake(2) 1690.97 Nigel Bunn(2) 2582.73
Graeme 724.64 Daryl Christiansen 621.34 John Belworthy 303.31
Tony Belle 1424.53 Adrian Melanesi 1230.50 Peter Wright 576.77
TECH NOTES
Preparation of Metal Propellers
Most props such as Octura & Prather come out of the plastic bag in their raw casting condition. They must be both balanced and the leading edge sharpened before use. This is particularly important with props that will operate in surface piercing mode (ie create a rooster tail). In this mode the blunt leading edge is extremely reluctant to enter the water when asked to do so and would far prefer to bounce off. This naturally also lifts the stern of the boat causing behaviour that is less than desirable.
With fully submerged props the problem is much less significant but submerged props should never-the-less still be sharpened and balanced.
Sharpening
Look at your new propeller. The edges of the blades will be quite blunt. The trailing edge, particularly on a X series, may even be square. A square edge is good on the training edge but on non X- series props it is hard to tell where the training edge starts. The surface of the blade facing rearwards will be slightly concave. DO NOT FILE OR ALTER THE SHAPE OF THIS SURFACE. Some authorities even advise against polishing this surface. It is the one that does the work!
The front surface will be slightly convex and this is the one to re-shape. Start filing from the leading edge. Rest assured, YOU CANNOT MAKE the leading edge TOO SHARP. You also want to taper the blade thickness gradually although it pays not to thin the blade too much (for durability reasons only). Once you are happy with the edge remove the file marks with fine wet & dry. You are now ready to balance. But first check that both blade tips are EXACTLY the same distance from the hub. To do this fix a short stub shaft into a block of wood and slip the prop over so that the tips rest on the wood. Make a mark in the wood EXACTLY where one tip rests. Rotate the prop and check that the other tip is the same distance from the hub (You may be surprised!)
Balancing
Balancing is quite easy but it is important to make a balance that is sensitive:
Cyano-glue two Stanley knife blades to suitable pieces of balsa or ply. Once set Glue the two balsa pieces to a base block of wood while holding the two blade edges against a pane of glass. This way you will guarantee to get a perfectly parallel pair of knife edges. Place the base block on a flat surface and place a short stub length of 3/16 prop shafting across the blades. It will roll off. Shim the base block until it no longer rolls off. You are now ready to balance. Place the prop on the stub shaft and place on the knife blades. One of the propeller blades will rotate to the bottom. Note which one and continue filing the back of that blade to remove excess metal. You are no longer trying to sharpen, just lighten. Continue until neither blade falls to the bottom and finally clean up with wet and dry.
Note About Prop-walking
Offsetting the strut does not compensate for prop-walk. It compensates for torque. An extended strut tube behind the strut blade compensates for prop-walk because it lets water hit the top half of the prop. Offsetting the strut to the right lifts the right side of the boat to fight the torque spin that throws the right side down.
John Finch (Yank)
DICK-OF-THE-DAY
No DOTD today.
Points Standings
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Driver |
Boat |
Points before Last Race day |
Total Points after last race day (8/07/01) |
Class I Off-S |
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Graham Doggett |
Ohio Steel |
147 |
147 |
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Peter Wright |
Obsession |
56 |
69 |
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Adrian Milanesi |
Orange thingi |
136 |
136 |
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Adrian Milanesi |
Orange & White Cat |
64 |
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Glen Sayers |
Blue thingi |
31 |
31 |
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Wayne Lester |
Bud Dry |
27 |
27 |
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Jason Lester |
Coca Cola |
81 |
81 |
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Tony Belle |
Blue & White sprint |
25 |
74 |
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Malcolm Miller |
Skulduggery |
125 |
192 |
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Brian Nesbitt |
Pussycat |
76 |
131 |
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Russell Day |
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26 |
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Class II Off-S |
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Glen Sayers |
Steves Model shop |
26 |
26 |
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Jason Lester |
DeWalt |
46 |
46 |
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Malcolm Miller |
Red Boat |
49 |
49 |
Hydros |
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Chris Breen |
Black Fire |
40 |
40 |
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Jason Lester |
DeWalt |
28 |
28 |
For Sale
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Zenoah (A12) powered Cat with radio.
Offers around $500
Also mono, hull only, Scarab 900 mm
Contact Neale Dearlove
233 4423
C/o Martin Morgan
Church Rd
RD 1
Tuakau
QUESTION:
What do you call spending 4 hours at the pond, using a gallon of fuel, running several boats on the water at the same time but not racing??? It is called FUN which stands for – “Find the Ultimate Needle”
Well that is all for this newsletter people – Go fast , turn right, keep the wet side down.
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C Breen – Editor
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