G'day Everyone ! ...
I just took a look at the "Maxwell site" .... (engine / propulsion
systems) .....
I gotta say - it looks j....u....s.....t.... like the OLD N.S.I. setup
... that went belly up & took a lot of people's money with them
NSI still owes a good friend of mine a complete firewall fwd package ....
and he's STILL waiting for it ..... years later ... and he's out of
pocket $20,000 U.S. PLUS ... :o(
Biggus
541R
----- Original Message -----
From: Bob Patterson
To:
rebel-builders@dcsol.com
Sent: Monday, October 08, 2007 4:09 AM
Subject: Re: [rebel-builders] 360 Prop
Hi Walter !
My concern with RPM & harmonic problems was not with just
the prop - Sensenich may be very happy, but I've seen videos of
the crankshaft in a 360 at rpm between 1900 & 2450 .....
It can really flex !!! I'm also surprised that they say 2500 rpm
gives almost full power -- they are rated at 180 hp @ 2,700 rpm.
We've been towing gliders with 360's in Super Cubs for many
years - one of the challenges is proper cooling on descent -
you need to keep the power up so it cools slowly. The problem
is - you can't come back gradually on the power - only a few
seconds allowed between 2450 and 1900 .... run it there
continuously, and you'll break the crank !
Robin & I both found that the 360's ran noticeably rougher
at & below 2500 - I usually used 2550 as minimum cruise -
Robin preferred 2650+ !!
The previous owner of the Rebel Garry is talking about
wrote several observations - they should be in the archives.
I recall he said something to the effect that the Prince
gave him 2500 on takeoff, 2500 on climb, and 2550 wot,
straight & level ... The whole idea is that it twists with
load, giving "almost constant speed". The one I test flew
certainly did that, although it was too fine overall for
the 196 hp !! It would happily buzz through 3,000 rpm
if the speed went over about 85 in climb !!! Pierre then
went up 4" in pitch - a bit too much the other way, unfortunately ....
The Prince weighs only 9 lb..... !!!! :-)
There are over 30 Rebels flying with them - surely
somebody will jump in ...
--
......bobp
http://www.prosumers.ca
http://bpatterson.qhealthbeauty.com
http://apatterson2.qhealthzone.com
http://apatterson2.ordermygift.com
-------------------------------orig.-------------------------
On Sunday 07 October 2007 13:54, Walter Klatt wrote:
I expect a little more than 180 hp with my new XP360 as well. It is
using
mostly Superior components, but will have the ECI cylinders.
Supposedly
these flow a little more as well, and with EI on one side.
As for the solid crank 360, Sensenich clearly specifies that there are
no
find
a lighter one that will hold up to water operations, and perform as
well,
I'm definitely interested.
I have heard you guys talk about the Prince, but I need more numbers
to
help with my assessment. Again, what I need to know first is take-off
or
static rpm, climb rpm, and then WOT straight and level rpm. And it has
to
Bob
Patterson
Sent: Saturday, October 06, 2007 9:25 PM
To:
rebel-builders@dcsol.com
Subject: Re: [rebel-builders] 360 Prop
Gee Walter !!
If you're going for a 360, why not pop for a Prince prop ??
It'll save you over 20 lb. on the nose - a very good thing !!!
(It will be an odd number - like maybe 76 x 46 .... )
I'm not sure about the solid crank helping with the
harmonic ranges - those are strong power pulses ....
but the Prince should be a lot better at avoiding problems.
Pierre used an XP-360 that was polished, ported, and,
most importantly, balanced - it dyno'd at 196 hp !!
Showed over 2,200 fpm climb with the Prince ..... :-))
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