IVO InFlight Adjustable

[av8rps]

I'm glad to hear of success with the 70 inch. I think that just might be the best compromise overall. However, as stated, if I had a 72 inch I'd try that before cutting it down.

When I had to cut my blades down (due to water erosion when I tried the plastic prop-guard) I measured as accurate as I could, and then when done I weighed them with a really accurate scale, which told me I had to sand some off one blade yet (not even measurable however). My new cut down blades run really smooth doing it that way. So that would be my recommendation if you decide to cut your blades down later.

It's ironic how different we all operate our planes that are so similar, but apparently yet so different. I commonly will fly my 912ul around under 5,000 rpm, as it operates so smooth in the 4600-5000 range. And with full pitch and only 4800 rpm I easily cruise around at 105 mph with still probably an inch and a half of throttle available (and remember, I'm on 230 lb amphib floats). At 5200-5400 I feel like the engine is not as smooth. Oh, and for anyone wondering, I have verified both my ASI accuracy multiple times, as well as my tachometer accuracy. So these are real numbers.

I would love to see how my plane would do with an IVO prop and a big bore 912 putting out 110+ hp. I think that would be really SWEEEET!!

Has anyone out there flown a model 4 with the 100 hp 912 and the IVO IFA? If so I'm curious what performance you are seeing.

[herman pahls]

Hi Paul
I read this thread because I am interested in trying a Ivo prop on my model 4 Kitfox with 912 100hp on 29" ABW's.
I was hoping to hear from someone who has experience with this combination.
I have flown the IVO inflight adjustable for years on my 582 powered model 2 with excellent results.
With my 912 100 hp I have had great results with the Warp, 3 blade, 70" and taper tip but struggle with how long it takes to adjust the pitch.
I wish for the inflight adjust feature for getting 5800 RPM for take off without spending $7000 for the alternative.
I also would like to know how the IVO-IFA prop performs on a 100 hp 912 in a Kitfox.
Thanks
Herman

Thanks again for the sea plane base tour Oshkosh 2014

[kmach]

The IFA Ivo medium three blade should be what your looking for.
I have been using this on my 912 uls for around 300 hrs. I had a sensenich ground adjustable ez pitch on it before, I couldn't go back to a fixed or ground adjustable now !
I have the limiters set as to get the full 5800 on takeoff , and then usually set it for 5200 - 5400 cruise.
Todays flight -8C , climb 1200 fpm, cruise 5250 rpm, 108 IAS with wheel skis on , 70 lbs luggage , full fuel and 230 pilot .

On a model 4 with the 912 uls you should get some real nice performance.
I'm sure others with that exact setup will chime in.

[Esser]

Is that 108 Knots?

[DesertFox4]

Classic model 4- 661 lbs. empty weight.
Rotax 912 uls
Ivo in-flight Patriot prop.
Pilot - 210 lbs
Full fuel
5300- 5500 rpm's @ 5.8 gals per hour fuel flow.
Altitude. 4,500' above sea level
120-125 mph cruise
Top speed level full throttle- 132 mph.

Speed mods- stut fairings.

[Slyfox]

mine is a constant 103kts GPS.

[kmach]

Is that 108 Knots?

No, mph .

108 Knots would be nice !

This is at 3000' asl and at 1340 take off weight.

[herman pahls]

Thanks Kmach, Desertfox4 and Slyfox for posting that you are using and apparently pleased with the IVO medium IFA prop since I am considering trying one on my model 4-912 100hp.
I currently use a Warp Drive (WD) 70" 3 blade taper tip with nickel leading edge protection.
I am pleased with the sea level performance of the WD other than how long it takes to adjust the pitch and that fixed pitch is always a compromise in performance..
I have been warned that my WD prop may be exceeding the Rotax recommended mass moment of inertia (MMI) and causing premature damage to the gear box and sprague clutch.
So I started shopping for props with less MMI.
I am considering the Prince suggested 80" fixed pitch prop ( $2400 ) but I would need extended gear (Grove $2100. ) to get adequate prop clearance even with 29" ABW's I am already using.
Extended gear + Prince prop = $4500.
The only IFA props that I am familiar with are the IVO and the Airmaster.
Both of which heavier than the Warp but possibly less MMI due to less weight at the blade tips.
John McDean at Kitfox is a big fan of the Airmaster.
The $7000. for the Airmaster and the added 10-12 pounds on the nose of a model 4 are a concern.
The IVO medium appears to be 4 pounds lighter than the Airmaster.
With the IVO and the Airmaster I would not need extended gear thus saving $2100..

So the questions I have for the IVO medium IFA prop users.
If money were not an issue would you be flying an Airmaster?
Do the IVO medium IFA or Airmaster exceed the Rotax recommended MMI?
If so it does not seem to be a major problem.
Would the all around performance difference between the IVO and the Airmaster be worth the additional approx. $4300 ?

Thanks for your consideration.
Herman

[DesertFox4]

Herman, my Ivo is not a medium. The Patriot is a lighter prop. It is about maxed out on the 100 hp Rotax but works very well and is less money than the medium. I still would go with the Medium Ivo thogh as the pitch change motor is more robust than those used in the lite prop line.

[Av8r_Sed]

I have been warned that my WD prop may be exceeding the Rotax recommended mass moment of inertia (MMI) and causing premature damage to the gear box and sprague clutch.
So I started shopping for props with less MMI.

Hi Herman,
Have you measured the MMOI of your current WD prop configuration to know if you're inside of the 6000 Kgcm^2 limit? I'm not sure why prop manufacturers don't provide this information, but it doesn't seem to be widely available. I've heard that a three blade 68" taper tip is under.