REFLECTOR: engine size & CS prop

[Scott Derrick]

> 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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