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Racing Throttle Linkage
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The manifold pressure of a piston powered helicopter is the way we tell how much power is developed by the engine. During normal helicopter flight the rotor rpm is kept constant therefore by varying the collective pitch and thereby varying both the thrust and drag produced by the blades the function of the engine is to keep the rotor rpm constant or in the normal operating range.
When flying a piston powered helicopter equipped with a governor the function of the governor is to automatically control the throttle in order to keep the rotor rpm constant so in essence the pilot only has to monitor the manifold pressure or set a specific manifold pressure to achieve a specific result. For the purpose of this explanation the result that gets referred to will be either to climb, descend or fly straight and level.
The problem that most students have is controlling the rotor rpm and manifold pressure combination in a non governor or correlator operated helicopter. The crux of the problem lies in the fact that the throttle by itself controls the rotor rpm as well as the manifold pressure and the collective by itself does the same. For example let's say we increase the engine rpm from 3000 to 3100 rpm by opening the throttle the MAP will also increase and let's say it does so from 18" to 20" manifold pressure. Now lets say we leave the throttle alone (constant) and we pull the collective up the manifold pressure will increase because there is a linkage (correlator) between the collective and the fuel injection unit or carburettor, however in most cases the rotor rpm will drop due to increased drag on the blades. If we push the collective down whilst keeping the throttle constant the MAP will decrease but the rotor rpm will increase due to less drag on the blades.
Now most people only focus or rather fixate on the engine and rotor rpm and chase the rpm up and down between the lower and upper red line with the throttle totally forgetting what the implications are on the manifold pressure. For example lets assume we have a manifold pressure of 20" but we sit with low rotor rpm, if the throttle only is opened to increase the rpm the manifold pressure will also increase lets say to 22" thereby causing the helicopter to behave differently with this "new" power setting. In the previous example if we wished to maintain 20" MAP whilst increasing the rotor rpm the correct action would have been to open the throttle and at the same time lower the collective pitch lever slightly.
One way of figuring out which control to use being it just the throttle, just the collective or a combination of both is to always have a target MAP in mind to achieve a desired phase of flight. In other words if one wants to climb, descend or fly straight and level give yourself a manifold pressure value to achieve this phase of flight and then think what the effect will be on this value before one simply opens or closes the throttle. After implementing this system for a while it will become a habit and by seeing certain combinations of rotor rpm and MAP values the right corrective action can be taken without thinking about at all.
© Harry Helicopter Training Syllabus 2008
http://www.harry-helicopter-training-syllabus.com
Honda Civic Type R Heading to South Africa
Honda, world’s largest producer of engines and quality acura parts such as acura brake pads will be presenting an exciting product in South Africa. The Honda Civic Type R is one of the highly anticipated performance vehicles in South Africa and will make its pre-debut at an exclusive affair in Johannesburg.
The three-door hatchback with its high-revving 2.0 liter iVTEC engine will officially go on sale in June. A selected group of journalists, celebrities, as well as aspiring owners are to have the privilege of taking a sneak preview of Honda’s most celebrated hatch.
The exclusive event at Johannesburg that will beheld at Hazeldene Hall was part of Honda’s SA’s pre-launch marketing strategy which will also include a drivetime radio-based competition with the objective of increasing consumer awareness for the Civic Type R and at the same time encourages more visitors to the micro site created for the Type R.
The Civic Type R boasts features that are simply hard to ignore while successfully delivering what Honda calls as “a refined and stimulating driving experience”. Honda’s chief engineer said that the Type R project if cut in half will reveal Honda’s blood. This remark is also the inspiration for the uniquely made, hand-delivered invitations which are in the form of blood plasma bags and with posing question---“What Type R you?”
At the event guests were greeted by fire and funk dancers with the Red Bull and Absolut Vodka serves as the welcoming drinks round up by flashing red LED ice cubes. Using their Honda-supplied ID tags, guests are ushered to explore the red and black Civic Type Rs on display from every possible angle. And just in case the sight of the fiery-hot Type R became too hot for guests to handle, there are models that are dressed in sexy nurse’s uniforms that are very much willing to provide assistance.
The entertainment will be provided by the guitar wizard Albert Frost and Springbok Nude Girls’ Arno Carstens supported by Tamara Day and Flash Republic, 5FM’s Nicole Fox and DJ Ricardo. John Laurence, Divisional Manager of Marketing at Honda SA said, "As one of the most exciting cars ever launched by Honda in this country, the Type R is targeted at young, trend-setting consumers who are image-driven and are seeking a premium vehicle. The preview served to underline the car’s originality, its unconventional status and its state-of-the-art concept. Judging by the reaction, the Type R is set to take the South African performance hatchback market by storm."
Here are the major features of the Honda Civic Type-R (source: worldcarfans.com)
Exterior Design
The exterior employs a pure sports one-motion form design with aerodynamically advanced surface treatment and sharp edges. Newly developed aerodynamic devices include a large air intake in the front bumper and grille, a rear bumper with built-in rear diffuser, a high-mount rear spoiler, and extended side sill garnishes, giving the car an aggressive overall appearance.
Specifically designed engine hood and front fenders.
Specially designed shiny black chromed front grille bar, headlight sub-reflector and Civic emblem design.
Type R red Honda emblem front and rear.
Interior Design
The overall black color scheme gives the interior cockpit a racing car-like appearance, bringing the driver closer at one with the car.
The front bucket seats are specially designed for Type R. Separate center/side construction with high side bolsters and optimized cushion rates help hold the body in place, helping the driver concentrates on driving.
The multiplex i-VTEC engine revolution indicator alerts the driver that engine speed is approaching maximum allowed revolutions. Self-illuminated, lit with red-colored flashing lights and is strategically located for minimum eye movement in circuit and other high speed driving conditions.
Other performance-oriented features include a small-diameter, genuine leather oval steering wheel, an aluminum ball-type shift knob, a short stroke sports shift linkage, metal sports-type pedals and footrest, and a separate, button-type engine starter.
Engine
A higher compression ratio and improved breathing efficiency help the naturally-aspirated K20A 2.0-liter i-VTEC engine output a maximum of 165kW (225PS) at 8,000 rpm and a maximum torque of 215Nm (21.9kgm) at 6,100 rpm.
NSX production methods contribute to smoother port surfacing, improving intake/exhaust airflow.
Drive-By-Wire (DBW) provides for finer tuning of throttle response and power output.
Optimum tuning of intake and exhaust manifolds provides for high output at high engine speed while also improving torque characteristics over a broad engine speed range.
Transmission
A close-ratio 6-speed manual transmission is matched to the Type R engine.
Optimized gear ratios offer superior accelerations at high speeds, providing exhilarating performance.
New features include a highly rigid aluminum transmission case while the addition of a baffle plate helps mitigate oil starvation at high cornering speeds.
A short stroke shift linkage contributes to a sporty shifting feel.
Highly Rigid yet Lightweight Body/Chassis
The highly rigid Civic body and its advanced layout serves as the basis for an even more highly rigid, yet lightweight Type R body. Measures to enhance body rigidity while reducing weight have translated into a body that is 50% more rigid than in the Integra Type R production model sold between 2001 and 2006.
Specially tuned suspension, high performance 18-inch tires, a torque-sensitive helical limited slip differential, large disc brakes for improved fade resistance and other performance-enhancing features contribute to higher cornering performance and stability for an exciting, racecar-like driving experience.
The specially tuned suspension boasts revised spring and damping rates, and thicker stabilizer bars for improved vehicle stability.
225/40R18-sized high-performance Bridgestone Potenza RE070 tires.
17-inch disk brake with Brembo 4-pot aluminum front calipers.
Specially-tuned ABS/EBD system.
Special lightweight 18-inch aluminum wheels are matched to black wheel nuts.
Safety Performance
Honda’s original G-CON (G-force Control) technology is incorporated to create a body with a crash safety performance that is among the best in the world, withstanding a 55km/h full-frontal collision; a 64km/h front offset collision, a 55km/h side collision, and a 50km/h rear collision.
The vehicle’s Advanced Compatibility Engineering body provides a high level of self-protection and also improves compatibility toward other vehicles.
The vehicle is also designed to help mitigate pedestrian injury in the event of a collision thanks to the use of impact-absorbing structures.
The front seats are equipped with 3-point, load-limiting ELR (Emergency Locking Retractor) seatbelts with E-pretensioners.
Front-seat occupants are further protected by standard driver/front passenger i-SRS air bags.
ISO FIX compatible child seat anchoring bars and tether belt anchor plates are standard on the rear seats.
Environmental Performance
The Civic Type R complies with the Japanese Ministry of Land, Infrastructure, and Transport emissions regulations for 2005.
PVC and Cr6+ use have been eliminated from interior and exterior components and wherever possible throughout the vehicle to achieve over 90% recyclability*.
About the Author
Evander Klum is a Business Administration graduate who hails from Alabama. He enjoys extreme sports and he is also a car racing fanatic. At present, he works as a marketing manager at an advertising agency in Cleveland.
golf 87 petrol 1800 engine racing?
my motor is carb model golf , revving it,s head off intermittently,the throttle cable has been replaced, and the linkage,s lubed , vw agent,s had it half a day i could not leave it with them as i need , the motor for holiday,s
is it drawing air at carb between manifold and carb im sure theres a plastic spacer ther that cracks if not is vacum tube on carb fail on that try float level inside carb and clean main jet and idle jet get more info on vw forums also check butterfly [flap at top of carb has not came adrift at linkage
BYU students cruise to the Formula Hybrid Competition in New Hampshire
PROVO — The blue-and-white hybrid zipped to the end of the parking lot and back, humming like a go-cart, then roaring...
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