Sherpa Re: Scott Tail wheel

[dasstolguy]

Bob P,

Thanks for your insights.

Two Questions:
1) Are the die springs you mention the same as the Murphy price list
Spring Gear Exchange for $505 USD?


2) Not to start any fires ( I have reviewed the archives and I am not an
engineer) but I read an interesting idea in the BearHawk group written by
Budd Davisson (who reviewed the Rebel once) regarding rough fields

--- Start of Budd ----
Re: rough field use.

One of the BH's weak spots in really rough field use is the shock
absorbing system although, in reality, there is no perfect system for
really rough work because you want it to displace and soak up the
shocks, but it has to come back to neutral and "recock" itself amost
immediately to be ready for the next hit. If it's slow coming back to
center, it can't absorb the next hit because it's already partly
displaced and if it snaps back too fast (like on bungees) it has too
much rebound. The BH shock strut is a good compromise, but could
probably stand to be another 1/4" in diameter for serious work.

The
Sherpa people solve the instant-recock, soft-rebound thing by putting a
large diameter, short stroke shock at the end of their bungee mount so
the gear can come back quickly, but can't snap back.

--- End of Budd -----

Would this Sherpa implementation work on a Rebel?

Rob (not an engineer) Sexmith
rsexmith@fuse.net



On 12/7/2001 9:09 PM, BOB.PATTERSON@CANREM.COM wrote to MURPHY-REBEL:

->
-> Hi Rob !
->
-> I'm with Wayne ! It's probably not nearly worth the hassle
-> to switch to the rod mount, and I'd go with the largest tires that
-> the factory offers, if you want real rough ground capability. The
-> Scott 3200 is working well on MANY Rebels, and is less expensive
-> than the 3400, as well as easier to mount.
->
-> A thought on "improvements" - you'll add <months> to your
-> build time - the comments here lately are: "Just get it flying -
-> homebuilts are NEVER <finished> !" ;-)
->
-> After you've flown your Rebel, you will likely find there's
-> very little you'd like to change - they're really great airplanes !!
->
-> At the risk of starting a great flame war, I'd say stick with
-> the bungee gear (or die springs, IF you do it the RIGHT way !) - <I>
-> think it's stronger, and better suited for bush work. If it does get
-> damaged, it will fail in a way that makes the airframe more easily
-> repairable. (I'll defer to Wayne for his comments on the ease of
-> repair aspect - he's fixed enough of 'em ! )
->
-> .....bobp
->
-> PS
-> You'll be glad that you chose the Rebel for this mission !!
->
-> -------------------------------orig.--------------------------------------
-> At 04:58 PM 12/7/01 -0900, you wrote:
-> >I am deciding on features for a Rebel kit before prices go up. The mission is
-> >Intermediate bush (wheels) eventually floats; thinking 8.5-6 main tires. In
-> >the Aircraft Spruce catalog, Scott tailwheels model 3200 and 3400 are offered.
-> > The catalog states that the 3400 is more heavy duty ?designed for use with
-> >tube spring mounting?.
-> >
-> >Questions:
-> >1)
-> >Is tube spring mounting possible on a Rebel? How?
-> >2)
-> >Pros cons of tube spring vs leaf spring?
-> >3)
-> >Pros cons of model 3200 vs 3400?
-> >4)
-> >Tips on matching tailwheel to mains?
-> >5)
-> >Would tailwheel selection affect main gear selection ( bungee, coil, spring)?
-> >
-> >
-> >Rob Sexmith
-> >Cincinnati to Killarney ON or bust
-> >
-> >
-> >
-> >** To unsubscribe, send e-mail to list-server@dcsol.com with **
-> >** UNSUBSCRIBE MURPHY-REBEL in the message body on a line by itself **
-> >** Archives located at http://rebel:builder@www.dcsol.com:81/default.htm **
-> >** To contact the list admin, e-mail mike.davis@dcsol.com **
-> >
-> >
-> >
-> >
-> >
->





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[Bob Patterson]

Hi Rob !

1. Absolutely NOT - the die spring gear is a mod to the
bungee gear that Wayne supplies (if you can convince him to do
a 'run' of 10 ...). That spring gear exchange will give you the
leaf spring gear - not nearly as suitable for bush work (just MHO !).

2. Maybe - but a lot of extra work (remember my comments
about 'mods' adding <months> !) The bungee setup for the Rebel is
a bit different anyway - it isn't supposed to move except to prevent
airframe damage. The TIRES are the primary shock absorbers !!
The bungee gear works just great in the rough - Wayne's die spring
addition gives a much smoother ride, but can give damage at extremes,
as there's no extra friction damping like the bungees give. You will
need Gord Mohr's gear fittings with bushings if you go to the die
springs, as the gear is moving constantly.

.....bobp

----------------------------orig.-----------------------------------------
At 09:15 PM 12/7/01 -0900, you wrote:

Bob P,

Thanks for your insights.

Two Questions:
1) Are the die springs you mention the same as the Murphy price list
Spring Gear Exchange for $505 USD?


2) Not to start any fires ( I have reviewed the archives and I am not an
engineer) but I read an interesting idea in the BearHawk group written by
Budd Davisson (who reviewed the Rebel once) regarding rough fields

--- Start of Budd ----
Re: rough field use.

One of the BH's weak spots in really rough field use is the shock
absorbing system although, in reality, there is no perfect system for
really rough work because you want it to displace and soak up the
shocks, but it has to come back to neutral and "recock" itself amost
immediately to be ready for the next hit. If it's slow coming back to
center, it can't absorb the next hit because it's already partly
displaced and if it snaps back too fast (like on bungees) it has too
much rebound. The BH shock strut is a good compromise, but could
probably stand to be another 1/4" in diameter for serious work.

The
Sherpa people solve the instant-recock, soft-rebound thing by putting a
large diameter, short stroke shock at the end of their bungee mount so
the gear can come back quickly, but can't snap back.

--- End of Budd -----

Would this Sherpa implementation work on a Rebel?

Rob (not an engineer) Sexmith
rsexmith@fuse.net



On 12/7/2001 9:09 PM, BOB.PATTERSON@CANREM.COM wrote to MURPHY-REBEL:

->
-> Hi Rob !
->
-> I'm with Wayne ! It's probably not nearly worth the hassle
-> to switch to the rod mount, and I'd go with the largest tires that
-> the factory offers, if you want real rough ground capability. The
-> Scott 3200 is working well on MANY Rebels, and is less expensive
-> than the 3400, as well as easier to mount.
->
-> A thought on "improvements" - you'll add <months> to your
-> build time - the comments here lately are: "Just get it flying -
-> homebuilts are NEVER <finished> !" ;-)
->
-> After you've flown your Rebel, you will likely find there's
-> very little you'd like to change - they're really great airplanes !!
->
-> At the risk of starting a great flame war, I'd say stick with
-> the bungee gear (or die springs, IF you do it the RIGHT way !) - <I>
-> think it's stronger, and better suited for bush work. If it does get
-> damaged, it will fail in a way that makes the airframe more easily
-> repairable. (I'll defer to Wayne for his comments on the ease of
-> repair aspect - he's fixed enough of 'em ! )
->
-> .....bobp
->
-> PS
-> You'll be glad that you chose the Rebel for this mission !!
->
-> -------------------------------orig.--------------------------------------
-> At 04:58 PM 12/7/01 -0900, you wrote:
-> >I am deciding on features for a Rebel kit before prices go up. The

mission is

-> >Intermediate bush (wheels) eventually floats; thinking 8.5-6 main

tires. In

-> >the Aircraft Spruce catalog, Scott tailwheels model 3200 and 3400 are

offered.

-> > The catalog states that the 3400 is more heavy duty ?designed for use with
-> >tube spring mounting?.
-> >
-> >Questions:
-> >1)
-> >Is tube spring mounting possible on a Rebel? How?
-> >2)
-> >Pros cons of tube spring vs leaf spring?
-> >3)
-> >Pros cons of model 3200 vs 3400?
-> >4)
-> >Tips on matching tailwheel to mains?
-> >5)
-> >Would tailwheel selection affect main gear selection ( bungee, coil,

spring)?

-> >
-> >
-> >Rob Sexmith
-> >Cincinnati to Killarney ON or bust
-> >
-> >
-> >
-> >** To unsubscribe, send e-mail to list-server@dcsol.com with **
-> >** UNSUBSCRIBE MURPHY-REBEL in the message body on a line by itself **
-> >** Archives located at http://rebel:builder@www.dcsol.com:81/default.htm **
-> >** To contact the list admin, e-mail mike.davis@dcsol.com **
-> >
-> >
-> >
-> >
-> >
->



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