smokelesscigs124
04.05.2021 8:11:21
PWR calculations are commonly used to predict vehicle speed.
See full version: Power to Weight Ratio (PWR) Calculator
PWR calculations are commonly used to predict vehicle speed.
250 / 2000 = 0.125 hp for every pound of car. more
This power-to-weight ratio calculator provides a quick and easy way to determine the power-to-weight ratio (PWR) of any vehicle.
Sail Area / Displacement ratio – The SA/D ratio is like the power/weight ratio of an automobile. A high SA/D ratio (> about 18) indicates a powerful rig, while a low ratio indicates a more docile boat. here
The Sail Calculator will also give you valuable performance numbers for any vessel in its database or any numbers you enter, including the Displacement / LWL ratio, Theoretical Limiting Hull Speed, Sail Area / Displacement ratio, Length to Beam ratio, Motion Comfort value, Capsize Screening value, sailing category and Pounds per inch immersion value.
Displacement/LWL ratio – Heavy boats (D/L above about 300) will carry big loads but require plenty of power to drive. Light boats (D/L below about 150) are generally quicker and more responsive but are affected by loading. Most boats have moderate displacement and they compromise the conflicting virtues of the extreme designs. Contemporary racing boats often have D/L ratios well below 100.
Naval architects use these values when they design a new boat, and from them you can determine a conventional displacement hull boat’s purpose and predict its performance. Note that planing hulls, catamarans and hydrofoil vessels are not defined in the same way. Here’s what the performance numbers mean:
Pounds / square inch Immersion – When you load a boat, it sinks deeper into the water. This Immersion value indicates the weight carrying capacity of a vessel.
One HP = 746W, so 0.137HP = 102W more
In the original question, he was asking if he should go with a Graupner 400 or 500 motor. here
As you can see, the length, beam and weight are all right on. The 40W power indicates that the Graupner 400 should be sufficient. It is rated at 35 to 75W. [links]
The scale I've chosen is 1:32. Cubed, that is 1:32,768. more
RC Boat Calculator - Calculate prop pitch from diameter and pitch ratio This Center of Gravity calculator is based on being able to determine the individual weight per landing gear. We use this to calculate the Center of Gravity ( CofG ) for a tricycle gear configuration. The tricycle gear configuration consists of one nose wheel and 2. The fundamental concept embodied in the calculator is that boat speed is in proportion to a hull factor coefficient times the square-root of the power-to-weight ratio. The effect of this relationship means to double the speed would require four times the power with no change in weight If the 500 motor was selected, the boat would have much more head-room, but may run the risk of having too much power. This can be cured by choosing an appropriate gear ratio. Model Boat Motor and Gear Box. Most scale models do better with a gear box to swing a scale size propeller. The working point of the motor will be more favorable Compute the Factor = Boat Length x transom width. If Factor is (to the nearest integer) 0-35 . 36-39 . 40-42 . 43-45 . 46-52 . Horsepower is . 3 . 5 . 7.5 . 10 . 15 . Note: For flat bottom hard chine boats, with a factor of 52 or less reduce HP one capacity increment . If the Factor is over 52.5 and the boat has
The weight of water displaced by a boat's hull. The boat displaces 18,200 pounds. A boat's
Starting with the boat's LWL, from the graph you determine the boat's C-value. You then calculate the predicted speed by using the formula: Speed (kn) = C * Sqrt(BHP/displacement) Once again, all this is valid for high speed planing hulls (speed/length ratio 3 or more). Be careful to express the displacements in tons This is a handy rule whereby boat speed in knots (V) is compared to hull waterline length in feet (L) where V divided by the square root of L = the speed/length ratio or S/LR. By way of example a boat 30 feet on the waterline at 6 knots has a S/LR of: 6 / 5.48 = 1.095 To find a boat's D/L ratio, you first calculate its displacement in long tons (DLT), with 1 long ton equaling 2,240 pounds. Then take the boat's load waterline length (LWL), multiply it by 0.01, and cube the result. Finally, take this result and divide it into DLT. The complete formula is as follows: D/L = DLT ÷ (0.01 x LWL)³ Generally, a larger, heavier athlete is capable of producing more power than their smaller teammate. In many cases this results in the larger person scoring better on the erg. This does not tell the whole story, because in on water rowing, greater body weight submerges the boat deeper in the water. This creates drag that must be overcome by the power of the rowers. The heavier the rower, the.