REFLECTOR: IVO Props

Scott Derrick scott at tnstaafl.net
Thu Feb 7 06:45:11 CST 2008


IVO told me specifically that they would not sell for Lyc 4(200HP) & 6 
Cyl. or Cont. 6 Cyl because they couldn't handle the power pulses.

Scott

Chuck wrote:
> I know Ivo will sell you a prop for Lyc 6's because I have one, and recently 
> bought parts for it. I'm not aware of any insurance problem with an IVO prop 
> when I've renewed my policy.
> 
> He won't sell you parts for a Lyc 4 cylinder because of a V crash several 
> years ago. The owner who had lots of "help" building his plane later had a 
> problem with the pitch motor, so he dismantled the prop enroute. Instead of 
> following the tightening sequence (4 retightenings over a couple hours) 
> which is absolutely critical (and well known), he was in a hurry and took 
> off with his family onboard. Shortly afterward he started getting a 
> vibration and advised the tower that he would see if it would go away 
> instead of landing imediately. The blades separated from the hub and all 
> perished. There was speculation that the powerful firing pulses every 180 
> degrees of the 4 cyl. causes too much load for the clamping strength of the 
> IVO, but there are other V's that have successfully used an IVO on their Lyc 
> 4's for a long time.
> 
> An Ivo is a less expensive (< $4K) in-flight adjustable pitch prop that 
> works on twisting the carbon fiber reinforced blades to change pitch. Some 
> people have said that this is not an efficient way to change pitch, but it 
> does work. The blades are very strong and seem to work well in a pusher 
> configuration. He has been making props for a long time particularly for 
> ultralights.
> 
> I'm sure some of the Franklin guys can tell us what they think of their 
> IVO's.
> 
> 
> 
> 
>> HYTEC45 at aol.com wrote:
>>
>> ?
>> ?
>> Ivo had such a problem with the Lyc 4's that he just "gave up", 
>> understandable.? However, with the right R&D the Ivo (or Ivo design) could 
>> probably work on the Lyc 6's.? The Ivo have worked on the Franklins which 
>> are 6 cylinders.?
>> I suspect it's an insurance issue.? I raised the question of 6 cyl Lyc and 
>> they said would refuse to sell the IVO for any Lyc.
>> John
> 
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