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15 December 2015

Hot tips for flying in the cold

The Science

LiPo, or Lithium Polymer batteries drain faster the colder they get because the chemical reactions that they use to create electricity are slowed. This starts to occur at temperatures lower than 59°F /15°C and is a known issue of all LiPo batteries.

Although made from military grade elastics, the launcher's elastic performance degrades when exposed to moisture and cold. During the tightening process of the launcher, the elastic fibers are getting elongated but do not revert as fast after the launch.

What this Means

In extreme cases, a battery would drain below 12.4 V, causing reduced thrust or even battery shutoff due to over-discharge protection systems designed to keep your battery healthy.

When launching the Tirmble UX5 / UX5 HP, it's possible that the vehicle doesn't reach the required takeoff speed and results in a failed take off.

Hot Tips for Beating the Cold

1. Make sure batteries are fully charged before each flight and keep them warm at 25°C.

2. Keep the launcher elastics in a warm and dry location as long as possible.

3. Minimize the time for which the launcher is exposed and tensioned. Proceed in the preflight checklist as fast as possible while respecting safety.

4. Respect the required obstacle clearance in front of the launcher.

5. Monitor the battery level during flight and land when requested. 

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