Specifications

6.3.5. LiPo battery monitor

If you are using a LiPo battery pack, you may want to use a LiPo battery monitor to avoid over-

discharging and damaging your expensive battery.

There are several LiPo battery monitors:

• The BattSignal by Jim Bourke Model Products weighs 4 grams and protects 2s to 6s LiPo

battery packs. It autodetects the number of cells in series and will provide an audible indic-

ation of the capacity left as the battery is discharged.

• The HRPoly-X by Custom Idea weighs 3.9 grams and protects 2s to 4s LiPo battery packs.

It works similarly to the BattSignal and can also log the battery voltage for 42 minutes, and

the data can later be downloaded to a PC.

• The Li-saver by New Creations R/C is not suitable for electric helicopters because it pulses

the main motor to indicate a low voltage condition.

• The MicroScream is a $5 DIY low voltage monitor for 2s or 3s which was posted to the

RCgroups DIY electronics forum. Search the forum for more info.

6.3.6. Battery mounting strap

Some helicopters may need a velcro strap to hold the battery to the frame.

For micro helis, the 1/2 inch Velcro Get-A-Grip strap can be used, which is available in 8, 12,

and 18 inch sizes. The 8 inch size is most often used for micro helis, and is Office Depot item

#369220.

For larger helis such as the Logo 10, the 3/4 inch Velcro Get-A-Grip strap (also called One-

wrap strap) works well. The 3/4" x 9' strap is Office Depot item #193464.

6.4. Motors and related items

6.4.1. Motor

For more details see Section 30.2, “Motor selection guide” and Section 30.3, “Motor selection

table” in the Chapter 30, Technical Appendix

6.4.1.1. Corona motors

Ideal Kv: 2700-3000 rpm/V - Main gear: 102T, 32 pitch

• Graupner Speed 500 Race #6307 (brushed) mild

• Kyosho Atomic Force (brushed) mild

• Mega Motor ACn16/15/4 (brushless) mild

• Mega Motor ACn16/15/3 (brushless) mild

• Hacker C40-12S (brushless) powerful

• Mega Motor ACn22/20/3HTDS (brushless, 8 cells/15T)

Note: The Mega Motor motors are very good for duration flights in the Corona. 10+ minute

flights are possible with some moderate wind.

Helicopter Parts Selection