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Hi Dustin,
I have flown behind the same automobile generator for over
10 years (550+ Rotary hours) without a single problem with it. I flew for
the first 5 years or so with dual batteries but finally realized that the only
thing I used the extra battery for was to assist on starts on cold mornings - so
I finally removed the second battery.
I actually build an ignition monitor for the Pmags on
Lycomings and so have some familarity with it and consider it an excellent step
up from magnetos - however, it is hard to beat solid state reliability when the
circuit is well design - they will generally far outlast anything
mechancial.
You can fly approx 45 minutes on a sound 17 AH battery
(don't ask me how I know) before things start to unwind. Probably for up
to an hour if you shut down everything electrical you don't need to
fly.
On the other hand, you have to feel comfortable and have
confidence in what you are flying behind or its not worth doing.
Ed
Sent: Thursday, January 27, 2011 8:20 AM
Subject: [FlyRotary] Re: Ignition systems
The magnetos were an example, I was hoping for something like
P-mags which are electronic ignition but don't require external power to operate
(tiny little alternator built in). Was the "solid state dang near bullet
proof" that you talk of Tracy's unit?
I know how to do a dual-buss setup,
with dual alternators, dual batteries, etc. If I can avoid the weight,
that would be nice, hence me asking.
Regarding having an hour of flying
time after electrical failure, what if I want more than
that?
Dustin
On Wed, Jan 26, 2011 at 11:33 PM, Dave <david.staten@gmail.com>
wrote:
On 1/26/2011 11:01 PM, Dustin Lobner wrote:
Hi Everyone,
I was just wondering, what is
available for ignition systems for a Renesis? I was hoping that there
would be something like a magneto or a P-mag that would still work if the
electrical system failed. I'm thinking about using Rotec's TBI fuel
injection system (mechanical fuel injection) that can work gravity fed if
need be. Only thing I'd need then would be a self-sustaining ignition
system and things would be looking
good.
Dustin
Let me understand.. you want
to trade a solid state dang near bullet proof ignition system for something
that has less energy and requires regular overhaul and
servicing?
Unless you are installing in a high wing, gravity fed will
be a non-starter (even as a back up).
You would be better served with a
dual battery redundant electrical system. Some folks are even running
permanent magnet generators. If you lose an alternator/charging source, you
can shed dang near all your load, and have over an hour flying time to get on
the ground..
Chris's plane has dual battery, independent busses, and
dual alternators. That setup is less failure prone than a mechanical device
that WILL require overhaul or replacement every 500 hours or so.
To
answer your question, I dont know of ANYONE running mags on any auto
conversion engines at all. Just lawnmowers and
lycomings/continentals/franklins.
Dave
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