Notes & Flight Log Data for Tow Defender

This page is where I write whatever changes I may have made, how the helicopter was flying before and after a change, or any other misc info I want to store and share with you.


Basic Project Cost

Fuselage - $260.

Align Trex600ESP complete minus receiver - $840 on sale.

Receiver JR R921 - $100 on sale.

Microbeast Flybarless control - $200.

ESC ICE HV80 - $180.

E-xra motor - $180.

Rotor Blades 550mm CF (Mavrikk) three sets of two - $180. First I tried 550mm woodies but didn't like. Set of five - $150.

Five Blade Rotor Head with swash and swash driver (Century diamond) - $450.

Tail rotor blades (larger than stock) - $12.

Cockpit instruments, controls, and seats - $350.

Battery pack 10S A123 - $165. These turned out to not be usuable and I bought lipos to replace (that sucked).

Total cost so far is $2,727.

Subtract parts not currently used - $315.

Total flying cost right now is $2,412.

Flight Setup:


Battery - 6S1P 2650mA Lipo. It worked much better with a 6S2P 2650mA setup. These batteries are for my 500 sized Airwolf, not for this heli.

Motor - Align RCM-BL600M (1220Kv)

Pinion - 14T

Main - 170T

ESC - Align 100A

RCVR - JR R921

Servos - Cyclic (3x) Align DS610, Tail is Align DS610

Gyro - GP780



Battery - 10S1P 5000mA Lipo. (I was trying a 10S1P A123 2300mA pack, but it just didn't have the power.)

Motor - Hyperion HS4025-630Kv (I was also using a 670Kv Xera motor, but it was too high a Kv rating.)

Pinion - 13T

Main - 170T


RCVR - JR R921

Servos - Cyclic (3x) Align DS610, Tail is Align DS610

Gyro - N/A

FBL - MicroBeast with rotor head phasing software version.

Flight Logs:

So far what I've learned is when I was flying pod-n-boom with the 5 blade head the tail worked fine. Once I put everything into the fuselage the tail did not have the holding power

needed to control the heli. I had to switch from 94mm to 110mm long blades. Now the tail works fine again.

I have also switched to Lipo's for motor power and the first hover test looked good. Need some forward flight data to compare.


I have done much more testing since I switched to lipo power, and reduced the motor Kv down to 630Kv. I think I could actually use between a 570Kv - 600Kv motor for a near

perfect setup. But I am very happy with what I have now. I also have reduced the head speed greatly down to a range of 1380, 1450, and 1500. Doing this has brought the power

requirements way down also, which is one of the things I was trying to do. Now the average current draw is around 28 Amps with a Wattage value around 1100. This is much

better than before when current was 35 - 39 Amps, and power was near 1500 Watts.

Now I can easily fly for seven minutes with the 5000mA lipos and still have plenty of reserve, and the heli will perform like I want it to.

The last battle I am fighting is a vibration. I found the blade grips were not all the same distance from the center of the hub. I found one grip was missing a washer (not sure how

the happened. Too much late night assembly I guess). I fixed that and did another test flight but it still has the vibs. So I will be going over the head further to see what else I may

have missed.

Date 12/25/2013:

I see it's been forever since I updated this project. Well it still has some vibrations which I have learned to live with, but don't like. Maybe a better rotor head is in it's future. Anyway,

I do not fly this heli much because I still don't like the way it feels in the air. It seems to want to roll backwards unless I am always pushing forward on the stick, but yet it will hover

just fine. I just made an adjustment to the cyclic pitch comp today, but it's winter here so won't be able to test for months. I was told be Joel on the Scale RC Helis forum to adjust the

elevator (pitch) gain up by 10% increments and see if that helps. That will be next summer for sure. I hope it works because I want to fly this heli more than I do now. It is a handful to

fly in the wind right now. The pitch curve will also be getting redone as described by Chris from the Scale RC Helis forum. He uses a linear curve and sets up around -2, 5, and +12

degree pitch, best I remember, it's close to that. Maybe 1 degree less on each end.

I have also installed a 510Kv motor for the Align 700 in it. This allowed me to bring the ESC settings up into the 90% range and it runs cooler now. Current head speeds are 1400,

1450, and 1500. Current draw is still mid 20's Amps best I remember.