If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
Ivo Prop on O-320
The following is information I am repeating, but have no first hand
experience with. I subscribe to several forums and lists that have discussed this from time to time in the context of Canard aircraft and auto conversion engines. One person who was running a Mazda rotary/wankel conversion in an RV 4 had a speed penalty incurred by using the product. He had a benefit at low speed with regards to performance, but broke even with a fixed pitch cruise prop around 140-150mph (that was installed later) and he had a signigicant penalty on the high end with the IVO top speed being about 187 mph and with the cruise prop getting him about 210-215 mph. Some of this is from his website (www.rotaryaviation.com) and some of this is from telephone conversations with him. I have given the IVO serious consideration for use on a Velocity with a Mazda engine conversion, and the IVO magnum used was the higher pitch variety. Apparently, since the prop adjusts by "blade warping", only the outer portion of the prop blade changes pitch and the inner portion does not. There have been reports of one flavor of lycoming causing problems with the torque pulses.. but I want to say this was the 360 CID variety of lycoming. A website forum with a thread on it is www.canardzone.com in the "Flying and Performance - Prop" subforum. The thread is labeled, simply enough "Ivo". Also have seen some incidental discussion of the IVO but not much substantive at "canardaviationforum.dmt.net", another Canard based forum. If used, you need to pay attention to detail with regarding prop bolt torque... the blades are essentially sandwiched between two flanges to hold them in position. There was a fatal accident caused by a field repair that was done under questionable circumstances by the pilot (who didnt have a torque wrench) that caused a slung blade and loss of aircraft and 4 people. This was more the pilots fault than the props.. the instructions are supposed to be pretty clear about the procedure. The consensus I have arrived at is that this prop does have utility, but it is not well suited to high speed applications. Perhaps a bush plane/cub copy would be able to take advantage of the adjustable pitch function without having to worry about a penalty at high airspeeds. Dave canflyboy wrote: Has anyone have anything to say, good or bad, about the Ivo Prop propeller for the Lycoming engines? The adjustment feature is quite unique and interesting, but I'd like to heard from users in the field for their opinion Thanks Canflyboy |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Right prop, wrong prop? Wood prop, metal prop? | Gus Rasch | Aerobatics | 1 | February 14th 08 10:18 PM |
Prop Pitch Question | Eugene Wendland | Home Built | 2 | April 25th 04 03:22 AM |
Hydraulic CS prop converting to Adjustable prop? | Scott VanderVeen | Home Built | 0 | December 5th 03 05:54 PM |
Clup prop | Corky Scott | Home Built | 8 | November 15th 03 04:39 AM |
Metal Prop vs. Wood Prop | Larry Smith | Home Built | 21 | September 26th 03 07:45 PM |