|
TachCalc Save fuel and
money by leaning your fixed prop engine at cruise – regardless of altitude –
easily with PilotGEEK's TachCalc. Aircraft POH's recommend leaning above 5000
feet to protect the engine from damage. TachCalc lets you quickly and easily
calculate your target RPM for the power setting desired for your current
altitude. And TachCalc
simplifies your fixed prop flight planning by allowing you to determine both
the best power setting for cruise at your selected altitude and the TAS to file. Features: · Improved user
interface. Adjust Indicated altitude, Altimeter setting, Outside air
temperature and % power utilizing: o Self-centering sliders o Direct keyboard entry o Customizable
display units § Altitude:
Feet or Meters MSL § Altimeter
Setting: inHg, mmHg, mBar, hPa § Temperature:
ºC
or ºF § Speed:
Kts, MPH, KPH § Fuel
Flow: usGPH, impGPH, LPH · Calculates and displays o Engine speed for desired % power o Pressure Altitude o Density Altitude o Indicated Airspeed o True Airspeed o Fuel burn at best economy (maximum lean) · Supports fixed pitch propeller
aircraft · 22 aircraft profiles included · Aircraft profiles can be edited to
match plane's POH · User defined
aircraft profiles |
|
|
Supplied Aircraft
Profiles ·
Cessna
· Flight Design o CTLS ·
Grumman
|
|
|
Editing/Creating
A Profile TachCalc allows
you to modify an existing profile to match your POH or create a new profile
from scratch. TachCalc uses linear
interpolation of the POH data to determine the RPM and TAS. The following procedure is for Piper that
uses charts to specify performance.
The majority of the other POH that I’ve reviewed use tables that allow
direct entry. Just make sure you chose
the standard temperature column. That
way the altitudes are Density Altitudes that are corrected for Temperature. To create a new profile,
or edit an existing profile: 1. Select a profile that is closest to the plane you wish to edit
or to use for a new profile and tap the EDIT button. 2. Update the Profile name for a new profile, or just leave it
alone for updating an existing profile.
If a new profile name is entered, the original profile will still be
selectable from the profile page. 3. Select the Alt Units, Speed Units and Fuel Units to match the
units displayed in the POH. Note in
the example shown in the chart below, the PA28-180C has true airspeed
specified in MPH and altimeter units in Feet MSL. A different chart has the
Fuel Flow specified in usGPH. 4. From the aircraft POH, determine the RPM and TAS for a high and
low percent power for the same density altitude and enter
into the appropriate fields.
You’ll note that on the chart below, 1000 Feet was chosen where the
55% power line crosses 1000 Feet at 2260 RPM and 118 MPH TAS. 5. Repeat for the High Density altitude 6. Click “Confirm Profile” to save or “CANCEL” to cancel the edit. |
|