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Sensnich ground adjustable prop on 912

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chris Sinfield

Joined: 28 Nov 2006
Posts: 270
Location: Sydney Australia

Posted: Sat Nov 12, 2011 7:52 pm Post subject: Sensnich ground adjustable prop on 912

Hi

 has anyone used the Sensenich Ground adjustable carbon fiber 2 or 3 blade prop on a 912?



looking at putting a new prop on a sportstar.. anyone have real world experiences?

Chris

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aa5flyer(at)gmail.com
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Posted: Sun Nov 13, 2011 4:34 am Post subject: Sensnich ground adjustable prop on 912

On 11/12/2011 10:52 PM, chris Sinfield wrote:

 	  Quote: 	
		   



 Hi

   has anyone used the Sensenich Ground adjustable carbon fiber 2 or 3 blade prop on a 912?



 looking at putting a new prop on a sportstar.. anyone have real world experiences?

 Chris





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=357656#357656





Got a 2 blade on my S-6.  So far very satisfied (80hrs).
	




Tim White

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Roger Lee

Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.

Posted: Sun Nov 13, 2011 5:50 am Post subject: Re: Sensnich ground adjustable prop on 912

Hi Chris,



I am in the process of testing 5 Sensenich props for Sensenich and run a 68" 3 blade on my plane. I set all kinds of props up. Give me a call and I'll be happy to help you out. I can also help if you decide to purchase one.

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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056

raybot(at)comcast.net
Guest

Posted: Sun Nov 13, 2011 9:12 am Post subject: Sensnich ground adjustable prop on 912

Hi Roger I have a question about my setup. I,m running a 290g in a rebel and 

a four blade warp drive. It works good but I top out at about 2600 or less 

and 110 mph at sea level. This motor is rated at 2700 and t-o at 2800. 

Should I consider a little less pitch? With the tail on the ground all 

blades are at 3deg. If less pitch, how much approximately,and what numbers 

would I shoot for and under what flight regime. I know a lot of this is in 

the archives but they don,t currently work. Ray

---

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Roger Lee

Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.

Posted: Sun Nov 13, 2011 11:43 am Post subject: Re: Sensnich ground adjustable prop on 912

Hi Ray,



The answer may come down to a personal choice. Some like the full rpm range and performance so then yes you could remove a little pitch to bring the rpm up a little. My guess for the pitch reduction would be about 1/4 degree to get the last 100 rpm. On the other hand some don't like being at the max rpm and worry a little or they try to get a little more speed out of the slightly courser pitch. Some though have too much pitch and don't know that they are overloading the engine which also causes extra fuel burn, loss of climb and loss of the very thing they are trying to gain and that's speed. If you can't get the torque or HP out of the engine because the prop is over pitched then it isn't good for the engine and self defeating for flight characteristics

You may want to ask yourself how much will that extra 100 rpm do for you and is it worth it? If you think you want it then make the adjustment. There is nothing lost here because if you don't like it you can always put it back. Personally I don't think the extra 100 rpm will give you much extra speed, but maybe a very slight extra climb. Your fuselage plays a very big part on the speed of the aircraft and it's not always about more HP or prop. That said matching a prop to engine and prop pitch is very important.



Nothing ventured, nothing gained.

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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056

raybot(at)comcast.net
Guest

Posted: Sun Nov 13, 2011 12:05 pm Post subject: Sensnich ground adjustable prop on 912

Thank you Roger  I,m pretty happy with the way things are really. It does 

everthing pretty good and if anything the motor seems to be picking up a 

little power as the hours increase. I thought I was having heat issues since 

I replaced the cht plug type sensor and was going over 400 too easily but 

have since learned that lycoming specifies the bayonet local and plug type 

sensors read higher. The 110 top speed is ok with me and these planes are 

draggy enough plus the ineffiency of a 4 blade says I,m not going much 

faster without burning a lot of fuel. Ray

---

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ghaley(at)wt.net
Guest

Posted: Mon Nov 14, 2011 9:06 am Post subject: Sensnich ground adjustable prop on 912

Roger,

I have been following your posts for some time now on the Kolb list.

I am an ex Kolb driver and now have a Highlander with a 912S "fuel injected" and a 74" Kiev.

I've talked to Sensnich about a longer "up in the 70's" ground adjustable prop and they said they had one in development.

Do you know anything about it?



  Gary Haley

  Dry Creek Airport, Cypress, TX (TS07)



--- ssadiver1(at)yahoo.com wrote:



From: "Roger Lee" <ssadiver1(at)yahoo.com>

To: rotaxengines-list(at)matronics.com

Subject: Re: Sensnich ground adjustable prop on 912

Date: Sun, 13 Nov 2011 05:50:25 -0800






Hi Chris,



I am in the process of testing 5 Sensenich props for Sensenich and run a 68" 3 blade on my plane. I set all kinds of props up. Give me a call and I'll be happy to help you out. I can also help if you decide to purchase one.



--------

Roger Lee

Tucson, Az.

Light Sport Repairman - Maintenance Rated

Rotax Repair Center - Heavy Maint. Rated

Home 520-574-1080  TRY HOME FIRST

Cell 520-349-7056





Read this topic online here:



http://forums.matronics.com/viewtopic.php?p=357745#357745

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Roger Lee

Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.

Posted: Mon Nov 14, 2011 9:45 am Post subject: Re: Sensnich ground adjustable prop on 912

Hi Gary,

I have not seen a prop fro Sensenich in the 70's. I am currently testing a couple of 3 blades for them and a couple of 2 blades. Be careful about over propping with a 74+" prop. You have to have the torque and HP to turn it with an efficient pitch angle. You could get too long and have to reduce the pitch angle to a point to be a poor performer. You may also get to much inertia out at the tips for the 912 gearbox too.

- The Matronics RotaxEngines-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056

ghaley(at)wt.net
Guest

Posted: Mon Nov 14, 2011 2:59 pm Post subject: Sensnich ground adjustable prop on 912

Roger,

Thanks for the reply.

I am happy with the Keiv and it's performance.

I was just looking for a prop that could be changed easily.

Gary



--- ssadiver1(at)yahoo.com wrote:



From: "Roger Lee" <ssadiver1(at)yahoo.com>

To: rotaxengines-list(at)matronics.com

Subject: Re: Sensnich ground adjustable prop on 912

Date: Mon, 14 Nov 2011 09:45:29 -0800






Hi Gary,

I have not seen a prop fro Sensenich in the 70's. I am currently testing a couple of 3 blades for them and a couple of 2 blades. Be careful about over propping with a 74+" prop. You have to have the torque and HP to turn it with an efficient pitch angle. You could get too long and have to reduce the pitch angle to a point to be a poor performer. You may also get to much inertia out at the tips for the 912 gearbox too.



--------

Roger Lee

Tucson, Az.

Light Sport Repairman - Maintenance Rated

Rotax Repair Center - Heavy Maint. Rated

Home 520-574-1080  TRY HOME FIRST

Cell 520-349-7056





Read this topic online here:



http://forums.matronics.com/viewtopic.php?p=357835#357835

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