Earthstar Forums

I have tried many props and even though the Ivo in flight adjustable changes the twist and not the whole blade pitch, it does, by far, give you, both, a lot of power for takeoff and much better cruise ( say, up to 10 mph safely and 20 mph but dangerously with a system freeze  ) Fixed pitch props can only deliver either great takeoff power or great cruise speed, but not both
If you just care for either cruise or takeoff; then, by all means, choose a fixed pitch


Sent via the Samsung Galaxy Note® 3, an AT&T 4G LTE smartphone

I'm nervous about the reliability. I had a ultralight version and had
nothing but problems. The thread was fragile but also motor moved in its
casing and that caused the wires to break every 10 or 20 hours.

For now, not for me. I'd rather have 90% full power 100 percent of the
time than 100% full power whenever the prop works.

Sounds like your experience is different.

-Alan

The ultralight version is reliable on a 50 hp 503. You had it on an 80 hp Hirth. My experience with in-flight adjustable (current, more robust model) was that it was hard to get just the right setting. I took it off and went back to ground-adjustable and was happy with that. Looking back, I think the perfect solution would be setting up the in-flight unit so that it was simply a two-position prop - max climb pitch and cruise pitch. Then you could toggle the switch four seconds either way and have it right. I think that would take an added washer and maybe even some machining of washers to get exactly the right dimension between coarse and fine. It was after trying to find a proper pitch in constant turbulence over the desert one spring day, without success, that caused me to remove it.
 
Dick O'Reilly


________________________________
From: Alan Cossitt <lownslowav8r@gmail.com>
To: "Earthstar_Aircraft@yahoogroups.com" <Earthstar_Aircraft@yahoogroups.com>
Sent: Wednesday, November 27, 2013 4:34 PM
Subject: Re: [Earthstar_Aircraft] RE: 700T install.



 
I'm nervous about the reliability.  I had a ultralight version and had nothing but problems.  The thread was fragile but also motor moved in its casing and that caused the wires to break every 10 or 20 hours.  

For now, not for me.  I'd rather have 90% full power 100 percent of the time than 100% full power whenever the prop works.

Sounds like your experience is different.

-Alan



On Wed, Nov 27, 2013 at 1:29 PM, jaime.g.sada@gmail.com <jaime.g.sada@gmail.com> wrote:


> 
>I have tried many props and even though the Ivo in flight adjustable changes the twist and not the whole blade pitch, it does, by far, give you, both, a lot of power for takeoff and much better cruise ( say, up to 10 mph safely and 20 mph but dangerously with a system freeze  ) Fixed pitch props can only deliver either great takeoff power or great cruise speed, but not both
>If you just care for either cruise or takeoff; then, by all means, choose a fixed pitch
>
>
>
>
>Sent via the Samsung Galaxy Note® 3, an AT&T 4G LTE smartphone
>
>-------- Original message --------
>
>From: Alan Cossitt
>Date:11/27/2013 1:46 PM (GMT-06:00)
>To: Earthstar_Aircraft@yahoogroups.com
>Subject: Re: [Earthstar_Aircraft] RE: 700T install.
>
> 
>The medium IVOs have a better screw thread (the correct square thread) but still I don't consider them reliable enough.  Also, since they twist the tip of the prop and therefore don't change the angle of attack throughout the blade they aren't as efficient.  I figure a good fixed pitch will generally equal a IVO adjustable and be much more reliable.
>
>
>-Alan
>
>
>
>On Wed, Nov 27, 2013 at 9:50 AM, jaime.g.sada@gmail.com <jaime.g.sada@gmail.com> wrote:
>
>
>> 
>>
>>
>>You guys with the IVO variable pitch propellers just be very careful
>>The  mechanism tends to fail pretty quickly and you MUST set it not too coarse (best for speed) as this setting, under failure, will not permit you to develop much power (engine bogs down) and you will have to land in gliding mode
>>
>>
>>
>>
>>Sent via the Samsung Galaxy Note® 3, an AT&T 4G LTE smartphone
>>
>>-------- Original message --------
>>From: Kess Blaswich
>>Date:09/28/2013 11:00 AM (GMT-06:00)
>>To: Earthstar_Aircraft@yahoogroups.com
>>Subject: Re: [Earthstar_Aircraft] RE: 700T install.
>>
>> 
>>You will like the inflight adjustable, it’s like a car transmission having
an overdrive. Finer for climb, two taps of the switch for fast cruise. My hangar
partner just installed the bigger Ivo on his 912 powered Titan, and we’re still
getting the brushes bracket fabricated. Should be interesting.
>> 
>>From: fgayford@silomail.com
>>Sent: Friday, September 27, 2013 1:44 PM
>>To: Earthstar_Aircraft@yahoogroups.com
>>Subject: [Earthstar_Aircraft] RE: 700T install.
>> 
>> 
>>I sure would Alan.
>>I plan on putting a HKS Turbo on my JT2. With an inflight adjustable
prop.
>>You would save me a lot of work.
>>Thanks
>>Fred
>>Post lots of pictures! 
>>
>>
>>---In earthstar_aircraft@yahoogroups.com,
<dave.bonkowski@...> wrote:
>>
>>
>>Yes I'd like to see how it goes.
>>
>>
>>
>
>On Wed, Sep 18, 2013 at 12:53 PM, Alan Cossitt <lownslowav8r@...> wrote:
>>>
>>>
>>>>
>>>>
>>>>Looks like I can move forward with installing a 700T (or perhaps E) on my airplane (Thundergull JT2). I'm debating about putting the install on the web (photos, brief text, maybe videos). Would any of you find this useful and interesting? I'd love to get more people aware of Mark Beierle's wonderful airplanes.
>>>>
>>>>
>>>>
>>>>I'll be doing the install starting in mid December when school gets out.
>>>>
>>>>
>>>>-Alan
>>>>
>>>>
>>>
>>No virus found in this
message.
>>Checked by AVG - www.avg.com
>>Version: 2014.0.4142 / Virus
Database: 3604/6703 - Release Date:
09/27/13
>

I had a UL IVO on my 65hp hirth. I had a medium ivo on my 85 hp, and it
was pretty reliable. The part that bothered me, and perhaps they have
fixed it, was the darn electric motor vibrating in its mount on the UL
version and having the wires break. That was just bad design.

Bill, I like your idea. That is sort of what I had set up.

I ended up with a fixed pitch
It's pretty scary when you find that you have not enough power to extend your glide to the runway or go around


Sent via the Samsung Galaxy Note® 3, an AT&T 4G LTE smartphone

Hi. I have an ifa Airmaster hub with Warp blades. It seems to me that if I entered the circuit and wasn't able to get it into fine pitch I would adjust my approach so that I didn't require any power - I don't think it would be a problem under normal circumstances.
Allan

No problem unless you needed to do a go-around, get caught in wind-shear,
bad weather, or just plain didn't estimate your glide-path correctly.

Having some power in a landing is much better than no power in a landing
(done both, and even having idle power is a big advantage), but still
having a prop at full pitch while landing decreases your chance of success.
Hopefully it very rarely ever happens.

Thanks, I am aware of that, being one who had one fail in coarse during take-off. Fortunately the runway was quite long and paved and I continued to climb out and when pushed over the speed built really quick. I converted back to ground adjust, and waited a year before sending the gear-box back to Ivo for a rebuild. When the rebuilt came back, I was amazed at how cheesy the gears are and the slop. One thing for sure, at annual time it will be re-greased.

k

And I agree with that too!

So far no motor shifting on my Gull, and lot’s of hours by now.

k