REFLECTOR: engine size & CS prop

Michael Watson mikewatsspg at gmail.com
Thu Feb 7 17:52:03 CST 2008


Correct !

However I must have low pitch version of the magnum.


On Feb 6, 2008 4:36 PM, Scott Derrick <scott at tnstaafl.net> wrote:

> > I have been using the IVO Magnum electric CS prop for ten years now.
>
> If its a CS(constant speed) static and cruise rpms don't really mean any
> thing as you can set it to what ever you want.  Correct??
>
> Scott
>
> > Static rpm is 2550, takeoff 27/2750 cruise 8500 is 23.5/ 2590.
> > Ivo replaced the drive motor after six years for free, no questions
> asked.
> > He also repaired the pivot arm on one blade and rebalanced the blades
> > for free.
> >
> > The only problem with the Magnum seems to be not enough base pitch.
> > With the Franklin fire walled in cruise at 8500 feet, it tops out at 178
> > KIAS.
> > It also tends to loose the SS prop guard after six to eight hours, which
> > sets up a slight vibration making the flight back to base interesting .
> >
> >
> > On Feb 5, 2008 6:16 PM, Greg Poole <greg at pooledresources.com.au> wrote:
> >
> >>  Care to let us know what cruise/top end you are seeing with that combo
> >> Tec?  "Aus"sume you are STD RG elite from memory…
> >>
> >>
> >>
> >> *Greg *
> >>
> >>  greg at pooledresources.com.au
> >>
> >>
> >>
> >>
> >>
> >> *From:* reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org]
> >> *On
> >> Behalf Of *HYTEC45 at aol.com
> >> *Sent:* Wednesday, 6 February 2008 01:32
> >> *To:* reflector at tvbf.org
> >> *Subject:* Re: REFLECTOR: engine size & CS prop
> >>
> >>
> >>
> >> In a message dated 2/4/2008 4:26:44 P.M. Pacific Standard Time,
> >> stedmanlou at adelphia.net writes:
> >>
> >> My problem is that I am not too happy with the RPM I get on takeoff.
> The
> >> best I see is about 2300.
> >>
> >>  I do not have the length and pitch of my catto at hand, however, I ran
> >> for almost 500 hrs with a performance 3 blade (then switched to an mt,
> >> then
> >> pitch the POS mt then went with the Catto).  While the Performance
> >> worked
> >> good all around, giving me 2450 rpm on take-off, the Catto will give me
> >> 2335
> >> rpm static, then once at approximately 40kts. the prop loads up and rpm
> >> drops to 2280.  I do not see 2400 rpm until 110kts.  This being said,
> >> the Catto, even though lugging the rpms down more than the Performance,
> >> it
> >> gives me approximately 15% reduction in take-off distance and the
> >> acceleration is noticeable from the seat.  Catto has the blade design
> >> down
> >> and more of the inner portion of the blade is biting in at lower speed.
> >> I
> >> think the Performance is cavitating in more of the root area than the
> >> Catto
> >> until airspeed picks up on take-off.  Once at 120kts and above, both
> >> props perform the same.  I have a IO360 with 10-1 pistons and came
> >> ground to
> >> optomize them.  I am putting out approximatly 220hp. which I related to
> >> Catto when I ordered the prop.  I'm sure I have more pitch than you,
> >> however
> >> the rpms sound right.
> >>
> >> TEC
> >>
> >>
> >>
> >>   ------------------------------
> >>
> >> Who's never won? Biggest Grammy Award surprises of all time on AOL
> >> Music.<
> http://music.aol.com/grammys/pictures/never-won-a-grammy?NCID=aolcmp00300000002548
> >
> >>
> >> _______________________________________________
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> >>
> >
> >
> >
> > --
> > Mike W.
> > 1997 Velocity Elite RG
> > Franklin /IVO Electric CS
> > _______________________________________________
> > To change your email address, visit
> > http://www.tvbf.org/mailman/listinfo/reflector
> >
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>
>
> _______________________________________________
> To change your email address, visit
> http://www.tvbf.org/mailman/listinfo/reflector
>
> Visit the gallery!  www.tvbf.org/gallery
> user:pw = tvbf:jamaicangoose
> Check new archives: www.tvbf.org/pipermail
> Check old archives: http://www.tvbf.org/archives/velocity/maillist.html
>



-- 
Mike W.
1997 Velocity Elite RG
Franklin /IVO Electric CS
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