Webra bearing life report

[Rcmaster199 at aol.com]

That is terrible bearing life from the set-up Keith. Mine lasted about 100 
hours (452 flights) until the pump finally went, which meant the engine ran lean 
for several flights and then the bearing went.

Bearing no 2 has run all season and has about 32 hours on it so far, or about 
150 flights; same engine with a new pump.

Fuel is the same cool power I spoke about before: 50:50 mix of 5% CP and 30% 
heli mix, plus one ounce of Klotz Pro per gallon

MattK


Prompted by Brian's excellent news regarding the new stainless steel bearings 
available for the Webra 1.45/1.60 I thought I'd share the following info on 
my Webra bearing life (standard non-stainless steel). 

I keep a log of all flights  including the duration of each flight (rounded 
to the minute). Last week I went through the arduous task of entering data on 
about 340 flights into MS Excel. I also keep a log of each bearing change so I 
was able to compile data on bearing life on over 70 hours of flight time. 

All of my statistics below are reported in hours because flights differ in 
duration. Also, the decimal points represent a fraction of an hour, not minutes. 
For example 2.5 would be 2 1/2 hours. 

I currently have three Webra engines, one in each of my two planes and one 
backup (thanks to the RadioSouth $259 special). I also had one Webra in which 
the bearings disintegrated and the engine was destroyed. Horizon replaced this 
engine free of charge (thanks Horizon). I have broken out bearing life times 
based on each engine. 

Webra 1: 
- Original Bearings: 12 hrs (may be off an hour or so, first runs were not in 
current aircraft and not logged)
- Bearing 2: 13.22 hrs
- Bearing 3: 9.40 hrs
- Bearing 4: still in engine, 0.67 hrs

Webra 2: 
Original Bearings, 7.85 hrs (bearings disintegrated and destroyed engine)

Webra 3: 
Originals Bearings: 11.38 hrs
Bearing 2: still being used, 6.37 hrs

Webra 4: 
Originals Bearing 9.02 hrs 
Bearing 2: still being used, 2.9 hrs.

As you can see the times for replacement vary between 7.85 hrs and 13.22 hrs. 
If you take out Webra #2 that suffered the early bearing disintegration then 
the range is consistently between 9 & 13 hrs. The average being 11 hrs.

I found this quite interesting as it represents a fairly consistent pattern 
of bearing life.

I'd be interested to hear anyone else's results or comments. 

Keith Black
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.f3a.us/pipermail/nsrca-discussion/attachments/20040926/4a39b192/attachment.html