REFLECTOR: engine size & CS prop

[Greg Poole]

Hmnnn, checked my 3 blade Catto prop down at the farm yesterday & the
sticker on it says: 66" diameter and 72" pitch, configured for 200HP Lyc in
173 RG Velocity with 2300rpm static and 2800rpm cruise. Craig Catto told me
in an email this morning that it is typical to add 500rpm between static and
cruise for his product but gave no idea of what to expect in terms of
performance. Seeing I have it in hand way way down here, he said I should
just try it and see what happens. 

I remain curious; has anybody got any idea/feeling/experience of how this
prop might perform on a SE RG instead of the large wing it was intended for?
I would guess I would have a little less air resistance on take off, a
longer takeoff roll at a little higher speed, a bit better cruise climb, but
what about top end?

Yes, like all of you, of course I want the factory cruise of 187kts,
miraculously short take off, and high rate of climb! (When you only live
once you want everything to be perfect!)

Greg 
greg at pooledresources.com.au 
 
 
-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Scott Derrick
Sent: Thursday, 7 February 2008 08:37
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: engine size & CS prop

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