Prop governor and firewall
Posted: Sun Feb 19, 2012 12:04 pm
Since I started this project, I assumed that some (several) builders have
used constant speed props on their O-320/360 Rebel and Elite projects. A
recent scan through the archives has not confirmed my assumption. Ah, the
dangers of assuming.
As I start fitting my engine to the firewall, I now realize that I will be
doing some extra firewall work to allow the prop governor on the Superior
XP-360 to fit. I'm more familiar with a Continental O-470 in a Cessna 182
with a small prop governor located up front next to the...prop.
On most Lycomings and the Superior (Lycoming clone), the prop governor is
located as far from the prop as possible (the rear) and is the size of a
trash can (well, not quite that big). Since the Murphy dynafocal mount
leaves barely enough room to slip a feeler gauge between the engine and the
Rebel/Elite firewall, I've got a problem.
Has anyone else blazed this trail on a Rebel or Elite? I've learned that
Vans has stainless steel boxes for those using constant speed props. So,
this is not a unique problem. The box rivets onto the firewall and sticks
into the cabin. The extra work on the firewall comes as a surprise (to me),
but looks to be okay with some concern about right seat rudder pedals (also
fixable). I won't be using a Vans box, as a custom fit will work better.
I prefer going constant speed and am using an MT-prop which weighs around 30
pounds less than a fixed pitch aluminum prop. But, firewall work is the
consequence.
Any other constant speed prop projects out there?
Eric Fogelin
Elite 645
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used constant speed props on their O-320/360 Rebel and Elite projects. A
recent scan through the archives has not confirmed my assumption. Ah, the
dangers of assuming.
As I start fitting my engine to the firewall, I now realize that I will be
doing some extra firewall work to allow the prop governor on the Superior
XP-360 to fit. I'm more familiar with a Continental O-470 in a Cessna 182
with a small prop governor located up front next to the...prop.
On most Lycomings and the Superior (Lycoming clone), the prop governor is
located as far from the prop as possible (the rear) and is the size of a
trash can (well, not quite that big). Since the Murphy dynafocal mount
leaves barely enough room to slip a feeler gauge between the engine and the
Rebel/Elite firewall, I've got a problem.
Has anyone else blazed this trail on a Rebel or Elite? I've learned that
Vans has stainless steel boxes for those using constant speed props. So,
this is not a unique problem. The box rivets onto the firewall and sticks
into the cabin. The extra work on the firewall comes as a surprise (to me),
but looks to be okay with some concern about right seat rudder pedals (also
fixable). I won't be using a Vans box, as a custom fit will work better.
I prefer going constant speed and am using an MT-prop which weighs around 30
pounds less than a fixed pitch aluminum prop. But, firewall work is the
consequence.
Any other constant speed prop projects out there?
Eric Fogelin
Elite 645
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username "rebel" password "builder"
Unsubscribe: rebel-builders-unsubscribe@dcsol.com
List administrator: mike.davis@dcsol.com
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