Backpack Deicer
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Backpack Deicer |
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1 Introduction
The Shergood Backpack Deicer provides basic deicing capabilities for small to medium aircraft. The deicer consists of a back mounted 5 gallon tank and a hand-held wand/sprayer.
2 De-Icing and Anti-Icing Fluids
2.1 Fluid Types
There are four main times of de-cing and anti-icing fluids used for aircraft: Type 1, 2, 3 and 4. Type 1 fluids are applied hot, have the lowest viscosity and are generally used for removing existing ice from an aircraft. Type 2 and 4 fluids include a thickening agent to make them stick to the aircraft to prevent ice from adhering to it. Type 3 fluids have an intermediate thickness between Type 1 and Type 2/4. Note that the anti-icing fluids Type 2,3,4 generally do not do well at ice removal. For the reason it is generally recommended that line personal first clear ice from the aircraft with Type 1 fluid, then if current weather conditions are conducive to icing, apply the appropriate anti-icing fluid. For Shergood aircraft, Type 3 anti-icing fluid should be used.
Each fluid is characterized by a HOT (Hold Over Time), and a minimum rotation speed. The HOT is the time the fluid will remain effective at preventing ice build-up, and the minimum rotation speed is the airspeed required to shear off the fluid. Type 2 and 4 fluids are generally used on large transport aircraft with high rotation speeds, while Type 3 fluids are used on medium sized aircraft. Type 1 fluids are suitable for all aircraft. The characteristics and colors of the four fluid types are summarized in the table below:
| Fluid | Color | HOT (min.) | Min. Rotation Speed |
|---|---|---|---|
| Type 1 | RED-ORANGE | n/a | n/a |
| Type 2 | STRAW | 0:30 | 100 Kts |
| Type 3 | YELLOW-GREEN | 0:20 | 60 Kts |
| Type 4 | EMERALD-GREEN | 1:00 | 100 Kts |
2.2 Tank Level
The backpack deicer is made of a translucent plastic with the fluid level and color visible through the plastic. When topped off, it will contain 5 gallons of fluid.
2.3 Servicing
Fluid for the deicer is distributed in 250 gallon totes (see Figure 1). There are separate totes for each fluid type. You can identify the fluid in a tote from the color and the label on the tote.
To transfer fluid from a tote to the deicer, using the following procedure:
- Rez the tote near you
- Click on the tote
- The tote will scan the area and search for anything nearby that can accept deicing fluid. Click on your own username to fill your backpack deicer.
If a tote is not completely used, its fluid level will be visible on the side of the container. If the backpack deicer contains a different type than the type of tote you press, the old fluid will be discarded and the full 12.5 gallons will be filled with the new type. If the tote contains the same fluid type, the deicer will be topped off with whatever is required.
By default, totes can only be used by the owner. You can change the access to the tote by clicking on it and choosing "[ACCESS]". You can select between owner-only, group-only and public access. You must also have access to the target vehicle in order to for the tote to detect it.
Totes are available for free from any Shergood store or other distributer. Totes are no-copy and can be discarded once empty. Locations at which totes may be obtained include:
3 About Experiences
For convenience, the wand attachment can be done using an experience rather than requesting permission each time. In SL, experiences are a way to grant permissions one time to a class of devices that are then remembered from then on out. To use the experience method you must:
- Have the land owner grant permissions for the "Shergood Aviation" experience on your land.
- Select "Yes" when attaching the hose for the first time.
After you have granted permissions for the experience, you will no longer need to grant permissions to attach the nozzle as long as you are on land that permits it.
3.1 Granting Land Permissions
To grant permissions for the Shergood Aviation experience on your land, click the parcel name at the top of your view to open the "About Land" dialog box, then go to the "Experiences" tab. Under "Allowed Experiences" select "Add...", then search for and add the "Shergood Aviation" experience owned by Kelly Shergood.
4 Caveats
Due to SCR-395, a wand attached in an area that requires you to be in a group to rez may not be able to rez the "deicer bullets" needed to function. The reason is that objects attached by script do not take on the group of the avatar when attaching. If this happens, it can be fixed by temporarily changing your group to another group, then back to the land group after the wand attaches.
