2018-01-11 UteRC Meeting

At this month's UteRC meeting, Show & Tell was dominated by useful RC gadgets and info rather than flyables.

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Aaron Loertscher (Pres., top), Steve Wilson (V.P., middle), and Keith Hiatt (Secy./Treas.. bottom) preside at the meeting.


Steve Wilson displays a lost model finder from HobbyKing that is meant to run on 5VDC. It blinks its lights and sounds repeated beeps when it has not moved for a minute or so if it is in an airplane that lands or crashes out of sight. The problem is it was designed to run on the Rx/servo power which may not be available if the plane crashes. Steve found a very small voltage booster that would produce 5VDC from a 3.7V LiPo. He combined the finder and booster with a small single cell LiPo into an independent unit that will flash and beep for about 24 hours if the plane lands or crashes. Here are links: iQ100 Lost Model Finder with LED Taillight Function, HobbyKing SKU 426000079-0 $7.90; Voltage Booster, Banggood Product ID 988184 $4.79.


Close-up of Steve's lost model finder flashing after it had not moved for a minute or so.


Doug Dorton displays a single cell LiPo charger board that will charge 6 1s LiPo's independently at the same time with 200 ma or 600 ma to either of two cut-off voltages. It has two plugs for each LiPo to accommodate the two common 1s LiPo connectors. It also has a pair of switches to set the current and cut-off voltage independently for each LiPo. A digital voltmeter on the board can be used to check each LiPo's charge state. The unit can be powered from any 6 to 26V DC source such as a multi-cell Lipo, 12V DC from a car, or a transformer-to-regulated DC unit that plugs into the wall. It also supplies a 5VDC USB output to charge a phone or other device. Banggood product ID 1170998 $11.99


Rick Marshall describes his Egg Drop bomb-bay, made from a micro servo and foam board.


Rick's Egg Dropping bomb-bay ready for attachment with rubber bands to most any airplane and the servo plugged into an Aux channel on the Rx.



Tony Naef describes a problem with his Hitec X4 Micro Multi Charger for 1s LiPo's. The smallest connectors (labeled MX in the photo above) have square pins at 1.25 mm spacing that do not match the most common 1s batteries which have rectangular sockets for the pins and a slightly different spacing. Those common batteries will plug in, but may be damaged by the mismatch. Hitec recognizes this and provides one short adaptor cable with the charger and sells a package of 4 to those customers having batteries needing them.


Tony had a problem finding any nearly square pancake 1s batteries for an older helicopter. He tried some common stick-style 1s LiPo's but found they will not deliver the continuous C-rated current stated on the label that is needed by the little helicopters. However, the pancake-style batteries will deliver the required continuous current for the helicopter application. Conclusion: the stick-style 1s LiPo's, because of their long shape, are not suitable for use in the small helicopters, even if they will fit, if you want reasonable flight times between charges.


Tony shows his Blade 180 Trio CFX, a 3-bladed, flybarless, fully capable 3D electric helicopter that he says is one squirrely handful to successfully fly.


Jim Buchmann shows a small battery-powered variable-speed Dremel tool that he found at Lowes for about $80. It has 4 white LEDs around the chuck so he can see what he is doing with the tool. It has a Li-ion battery that recharges from a wall-powered stand. It has lights that indicate the battery's charge status so he knows when it needs to be recharged.

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