Ben, as painful as this might be I would suggest you sell the Ross drive if you will be running a 20B. Tom Parkes built a 20B powered Lancair ES. The engine digested his Ross drive. Fortunatly it wasn't a catastrophic failure, but sometime somebody running a high power engine is going to have one. The Ross was a reasonably well made unit for it's time, but many people have trouble running just a 13B engine. Putting 50% more power and torque thru that unit is just risky. It would be much better to sel it to somebody running a Subaru, (for which it should be adaquate). You really need one of Tracy's later beefer late model drives, (either ratio), to be safe. Tom Parkes is redoing his FWF noew with Tracy's drive. I have an RV-10 and a 20B. I will run either Tracy's RD-1C 2.85:1, or the Mistral redrive approx ratio 2.82:1. I consider the Mistral drive which costs almost 3 times as much as Tracy's only because it is set up for a HYD CS prop from the start.
Ben,
It sounds as though you also need to check the thrust
bearing. IIRC, there is an upgrade for that, which greatly
increases the longevity of the drive.
Dale R.
> From: "Ben Baltrusaitis" <ben@gmpexpress.net>
> Date: 2005/06/14 Tue AM 06:35:32 EDT
> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> Subject: [FlyRotary] Re: Ross unit disassembly
>
> Kelly, it's a 2.17.
> It appears that the four nuts on the back side hold the input shaft bearing
with big flat washers. Unfortunately, the bearing allows the shaft to move up
and down a lot and their is too much shaft movement forward and back. Their was
a reverberation at 3200 rpm that sounded like it was coming from the planetary
gear.
> This is on a Subaru engine, not a rotary. My 20B is still on my workbench.
> Thanks!
> Ben
> ----- Original Message -----
> From: Kelly Troyer
> To: Rotary motors in aircraft
> Sent: Tuesday, June 14, 2005 1:19 AM
> Subject: [FlyRotary] Ross unit disassembly
>
>
> Ben,
> Is your Ross drive 2.17-1 or 2.85-1 ?
> --
> Kelly Troyer
> Dyke Delta/13B/RD1C/EC2
>
>
>
>
>
>
> -------------- Original message from "Ben Baltrusaitis"
<ben@gmpexpress.net>: --------------
>
>
> I need to get my Ross redrive apart to check the planetary gear. I have
the whole unit off the engine and the 16 nuts off the cone where the planetary
gear is located, but I can't get it to come apart.
>
> Do I have to take the four nuts off the back side to get the cone off?
> I don't have assembly instructions. I would really appreciate someone's
help!
> Thanks!
> Ben
>
>
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