|
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
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
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
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
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?
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