Finn,
It is really not too late. Frank told me
that a prop in my condition was worth $1000, but I want only
$700 for it. That includes the crush plate and bolts. That
brings the total cost of the prop down to probably around
$600. It is 76 inches long and needs to be cut down to at
least 74”. You can do that yourself. You don’t really HAVE
to get the rain edge installed. That would save you the $700
that Frank is charging for that service. And maybe even Ed
Sterba could do it for you. Think about it.
Worst case you would have a brand new $2600
prop for $1400! Not a bad deal anyway you cut it.
Bill
Sent from Mail for Windows 10
After sending the below, Ed Sterba replied:
"I'm not sure I will be able top make you
a prop at this time. I don't use a duplicating machine, all
props are hand carved and I'm getting older and having
difficulty carving the bigger ones.
Ed"
So there goes my plan for a $650 prop.
Performance props are now $2,700 according to Bill B. They
want $700 to finish his prop (that's normally included in
the price). I paid $875 in 1999 for my RV-3 Performance
prop, so that 300% inflation. That's going to bust my
$20,000 budget.
Any ideas for a cheaper prop?
I was thinking about building a prop duplicator and
duplicating my RV-3B prop (or Tracy's RV-4 prop if I can
borrow it). But where does one get 4 3/4" prop blanks or
wood? Not sure I trust my ability to laminate wood...
Finn
Installation will be quite similar to Tracy Crook's RV-4.
Here are some of his notes [from https://web.archive.org/web/20111120073159/http://rotaryaviation.com/renesis_engine.htm]:
"Clark
at Performance Props was very honest about
the difficulty in getting the proper pitch at the blade
root (out to ~ 3" past the 13" dia. spinner) with pitch
this high. [88" ?]
Other
conclusions are that anything less than 74" L prop is a
waste on the -C [2.85:1] drive.
I
must emphasize that in order for this to work [2.85:1 gear
reduction instead of 2.17:1], the prop must not only be
long but has to have a good profile as far down toward the
root as possible with the MUCH higher pitch. I worked
with Clark at Performance Props and emphasized this. It
required a thicker than standard [4-3/8”] hub to get close
to what was needed.
If
you don't do these things, all you get is significantly
higher rpm, less performance, higher fuel burn and higher
wear. Tracy"