Go Helicopter Vacation - Big Bear
I am still working on this part of
the web site. Because it has turned into a hobby, I have limited
time to work on it. I am about to take this machine on a vacation
trip with my family. We intend to go from Orange County to the San
Francisco area for five or six days of seeing the sites and visiting friends.
We plan to take lots of pictures. I will put a link on this page
and share them with any who might enjoy them. I look forward to the
trip.
I have always enjoyed helicopters.
I did not fly them much for about 15 years, and only recently got current
in order to provide some instruction for two of my friends that each own
a Gazelle. It's a shame they don't still make these helicopters,
because they are better than the Astar that replaced them. They leave
other helicopters, and many light airplanes in the dust. A cruise
speed of 130 knots is quite realistic. It feels great when ATC asks
you to slow down to follow an airplane in the pattern. That happens
often in the Gulfstream, but is kind of special when you are flying a helicopter.
SA-341G |
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Maximum Airspeed vs Altitude
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Center of gravity is of prime importance. Out
of CG will kill you much quicker than over weight. Operating outside
the CG limits in a helicopter will more than likely result in a crash shortly
after lift off. A great way to increase your chances of survival
is to operate within the limits in the table below. Do we solve a
weight and balance problem before each and every flight? No, not
unless we are operating on an air carrier certificate. Compute weight
and CG for the typical loading you plan to use. If you are going
to deviate from your typical loading profile, work a problem to see if
you are still within limits. When leaving the ground with an unfamiliar
loading configuration, Always transition to a hover slowly,
and note where the cyclic must be positioned. If more than one half
deflection in any direction is required to maintain your position and attitude,
set down and adjust the load such that less than half control deflection
is required. This will result in a longer life for both you and the
helicopter.
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Datum = 118.1 inches or 3 Meters forward of center of main rotor head.
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Note: Maximum gross weight may be limited by the
helicopters ability to hover.
See Page
6 in section 4 of the AFM. The data computed from this chart
is an
Operating
Limitation for the Gazelle Helicopter. Comply with it.
For the Gazelle, as well as other helicopters, there are two charts that address the particular helicopters ability to hover. They are IGE, or "In ground effect", and OGE or "Out of ground effect. In the case of the Gazelle, the IGE chart is limiting. If you comply with the limits in this chart, you are legal, and more than likely safe to operate as long as the takeoff and landing areas are free of obstructions in your proposed takeoff or landing flight path. The "OGE" or out of ground effect hover ceiling chart is the one to use when operating in a confined takeoff or landing area, or when faced with obstructions in your proposed flight path. For example, landing on a roof top helipad would be much safer if you comply with the "OGE" hover chart, because you would not need to remain in translational lift until hovering over the pad. If you can hover out of ground effect, and limit your rate of descent to 400 fpm or less, landings on rooftop helipads, or aboard a yacht may be done quite safely.
Maximum Weight / Hovering In Ground Effect.
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Maximum Weight / Hovering Out Of Ground Effect.
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Maximum Torque
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Turbomeca Astazu III A Engine
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+30 deg C when OAT less than + 5 deg C |
The hydraulic system on the Gazelle provides hydraulic boost for the Cyclic. The hydraulic pump is driven by the transmission, not the engine. This allows it to function during autorotation in the event of engine failure. The aircraft is controllable without the hydraulic boost, but the control forces are higher. The boost can be turned on and off with the switch located on the left collective.
The fuel tank system on the Gazelle consists of one
main tank. This tank holds up to 120.2 Gallons. An optional
Aux Fuel Tank is installed on some aircraft. It has a fuel
capacity of 24 Gallons, and fills itself automatically when the main fuel
tank quantity is 30 gallons or greater. As fuel is added the main
tank will remain at 30 gallons until the Aux is full, then increase as
fuel is added until both tanks are full.
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(Avoid with less than 13 Gal Fuel) |
12 deg / Nose Uphill |
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30 kts 30 deg +/- Centerline 9 deg Roll / 2 deg Pitch |
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Inspect for Ice each hour |
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or Stop Main Rotor |
Over 25 Knots / Full Rotor Brake from 170 RPM to Stop |
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Rotor RPM Limitations
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Note: Add 10 RPM to minimum rotor RPM for each 3,300 feet above 3,300 MSL
Autorotation from 10,000 ft @ 65 kts = 3.25 nm distance
Back to: Airplane Driver's Network