Red Lion DT 800 000 rotor rpm tach

giro5

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Mar 19, 2006
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Farmington, New Mexico
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Has anyone taken one of the DT 800 000 red lion tach's apart and replaced the battery? Seems mine has expired. A new tach is now $146 dollars and I suspect a battery would be around $10. I sent Allied Electronics tech support and asked if they could replace the battery but no answer. (what about that for service - they could at least said no). If I have to buy a new one the old one is coming apart one way or another.

Bad timing on my part I went past the 5 year battery life on the tach battery. I wanted to get a tach reading comparing my bensen blades to my rotor hawks and was making a preliminary tethered test on the bensen's since we had some wind on Monday. Finally got my rotorhead installed on the gyrobee like gyro and found a couple of things not to my liking compared to my kb2. First is the amount of throw forward and aft of the control stick. It is a lot on the gyrobee when I adjust it for full aft just prior to touching the seat the forward position is way forward. I would not be able to move the stick thru full travel if I had shoulder restraints. And second because of the tall mast on the gryobee one person cannot hold the stick and hand start the blades. It takes two to tango or in my case hand start the blades on the gyrobee. On the plus side the bensen blades do not come very close to the rudder even in the full aft cdontrol stick position. (Bensen's are 22 feet long. Rotohawks are 27 feet and can hit not only the tail but the ground on the kb2)
 

GyroChuck

Gyro's are more fun
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Naperville, IL
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It's a little bit of a pain to replace the battery. But I did replace my battey several years ago. It's still working. You need to solder the new batter in.
 

dinoa

Junior Member
Joined
Apr 3, 2007
Messages
798
Location
florida
Been using one of these for 10 hrs now with good results though hard to see in direct sunlight.

[18,54€ 7% OFF]High Precision Digital Frequency Tachometer 0.56" 4 LED DC 8-15V Car Motor Speed Meter RPM Speed Tester 5-9999R/M Measurement & Analysis Instruments from Tools on banggood https://banggood.onelink.me/zMT7/ii1qxh1a
 

giro5

Senior Member
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Mar 19, 2006
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Location
Farmington, New Mexico
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prev- citabria,AA1b, fun racer
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gyrochuck do you remember how you took it apart? Looks like there are 3 locking tabs on each side and they do not seem to want to give. I was thinking about milling them out or making a press bar to push them in with a mechanical press.
 

giro5

Senior Member
Joined
Mar 19, 2006
Messages
1,272
Location
Farmington, New Mexico
Aircraft
prev- citabria,AA1b, fun racer
Total Flight Time
400 GA, 50 trike
Thanks helipaddy. The tabs on mine are tough to push in but I will get them. The old thread says 80 bucks today they are 146 bucks for a new one.
 
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