Where should the CG be on an RC plane?
As a very general rule of thumb the CG will be about one-quarter to one-third of the wing chord (width) back from the leading edge of the wing. The main spar, if there is one, often lies in this general area.
How do you calculate CG limits?
To determine the CG, divide the total moment by the total weight. The total loaded weight of 3,320 pounds does not exceed the maximum gross weight of 3,400 pounds, and the CG of 84.8 is within the 78–86 inch range; therefore, the aircraft is loaded within limits.
How do you balance props without a balancer?
If you don’t have a prop balancer but need to balance your prop, do what I do. Grab a paper clip, straighten it out, hold it level, and balance your prop using duct tape. That way you lose no thrust from sanding, and you don’t have to fork over any money on a prop balancer.
What causes propeller imbalance?
Causes of vibration: propeller A mass imbalance is when the center of gravity of the propeller is not in the same location as the center of rotation of the propeller. It is usually caused by the removal of material on blades to repair nicks or from differing degrees of blade erosion.
What causes an RC plane to porpoise?
porpoising is usually caused by a tail-heavy condition. It is indeed a SA Micro Stik 26in wingspan.
What will happen if CG is too far forward?
During landing, one of the most critical phases of flight, exceeding the forward CG limit may result in excessive loads on the nosewheel, a tendency to nose over on tailwheel type airplanes, decreased performance, higher stalling speeds, and higher control forces.
How does CG affect aircraft performance?
The relationship between aircraft performance and CG location is simple: by moving the CG forward and aft, you change the amount of tail down force and lift you need for stable flight. If you need more lift, you create more induced drag, and your performance goes down.
How can an unbalanced condition of propeller be corrected?
When an imbalance condition occurs, a series of magnets within the balancer are actuated. These magnets shift the imbalance weights and bring the propeller back to a balanced condition. Not only does the IPBS eliminate the need to rebalance propellers on the ground, the system itself requires very little maintenance.
What are the two methods used for balancing a propeller?
In addition to static balancing, most propellers benefit from dynamic balancing. Dynamic balancing is the process of measuring the vibration of the entire propeller and engine assembly while it is in operation.
How do you fix a porpoise landing?
When the severity of the porpoise is very slight (there is no extreme change in the airplane’s pitch attitude), the recommended recovery procedure is to slightly increase the power, which will cushion the subsequent touchdown, and smoothly adjust the pitch to the proper touchdown attitude.
How do I stop bouncing on landing?
The key to stopping a bounce is flying a stabilized approach, all the way to the ground. If you come in too fast, bleed off airspeed during your flare, or go-around. And if you have a high descent rate just above the runway, go-around.
Does a plane need to be balanced?
Most aircraft do not have a large enough MTOW to carry a 100% full cabin of passengers, all their luggage, a fully loaded cargo hold and full tanks of fuel; therefore, a balance is required.