Author Topic: Another Cloudcar Prop  (Read 2552 times)

Schmleff

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Another Cloudcar Prop
« on: Sep 29, 2010 »
is getting close...

Only bummer is that its 3" thick, which means a custom spinner front bulkhead. Jay says its necessary to get the blades right. I intend on giving it a whirl (pun intended) this year sans spinner.

Jeff Lange
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Buy the best and cry once - Gene Berg

eschrom

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Re: Another Cloudcar Prop
« Reply #1 on: Sep 30, 2010 »
A pretty young lady and a pretty prop! Is it for climbing faster, cruising faster or both?


I don't think my daughter would get off Facebook long enough to pose with an airplane part.

Ed

Schmleff

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Re: Another Cloudcar Prop
« Reply #2 on: Sep 30, 2010 »
I think that its Jay's wife. She has been in all of the picts he has sent me over the years. Not sure though, I can't tell how old Jay is by talking to him.

The prop is for a little more speed. Not sure if I will loose climb or not. My engine is still pretty mild but its right at what I am comfortable with for year after year full throttle operation. If I pep the engine up a little more, I need a little more pitch.

I have never been too excited about the wide blade tips of the Prince prop either. Just want to see how other props behave.
Jeff Lange
Sonerai I
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Buy the best and cry once - Gene Berg

eschrom

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Re: Another Cloudcar Prop
« Reply #3 on: Oct 01, 2010 »
Good luck with it.

I wonder if Juergen has had a chance to modify his prop tips yet? I'm interested in this stuff because I've set a goal for my 2LS: 160 mph cruise on 4 gph. There are plenty of other improvements to be made before changing props though.

privatepilot03

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Re: Another Cloudcar Prop
« Reply #4 on: Oct 01, 2010 »
...I've set a goal for my 2LS: 160 mph cruise on 4 gph....

Good luck with that.  I'm interested to hear how this ends up.  I could cruise @ 155mph but my fuel burn was closer to 5gph.

Vee-Power Systems LLC
Rear Drive VW engine conversion parts & kits.

eschrom

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Re: Another Cloudcar Prop
« Reply #5 on: Oct 01, 2010 »
Well...maybe I won't get there but I'll try, at least until it's not fun anymore. There is a book called Speed with Economy whose author says he got over 40 mpg in a Mustang II at 170+ mph, so I have to believe it's possible in a Sonerai. However, at the pace I work don't look for any announcements soon.

juergen

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Re: Another Cloudcar Prop
« Reply #6 on: Oct 01, 2010 »
I have not finished my modified prop yet, I need to make the final sanding and also the new balance. All the molding works are done and I had made some pictures about the work. Also I must prepare the new spinner and so, I think I do not mount the new prop this year for flying. I had only ground test the prop and have with this modified prop (without moldings) about 3300rpm static with about 100kp thrust, my actually prop takes 3400rpm and 115kp thrust on static. On static, there is no stable airflow round the airfoil of the prop and so, this numbers makes only a clue about the start roll distance.
On Monday, I will upload the pictures of the prop modifications, because on my home Pc, I have a very poor internet access and uploading some pictures takes too much time.
with best regards
Juergen

privatepilot03

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Re: Another Cloudcar Prop
« Reply #7 on: Oct 01, 2010 »
Well...maybe I won't get there but I'll try, at least until it's not fun anymore. There is a book called Speed with Economy whose author says he got over 40 mpg in a Mustang II at 170+ mph, so I have to believe it's possible in a Sonerai. However, at the pace I work don't look for any announcements soon.

Yup, I own that book.  Good information for sure.  Not saying it can't be done, I am just saying it will be a tall challenge.  4gph is about 48hp.  Not a lot of power to pull a lot of prop.  Worth playing with for sure though.

chad
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Schmleff

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Re: Another Cloudcar Prop
« Reply #8 on: Oct 11, 2010 »
Mmmmmm.

Its the center one. $390 shipped!
Jeff Lange
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Buy the best and cry once - Gene Berg

Schmleff

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Re: Another Cloudcar Prop
« Reply #9 on: Oct 19, 2010 »
Hope to fly it this week.
Jeff Lange
Sonerai I
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Buy the best and cry once - Gene Berg

Schmleff

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Re: Another Cloudcar Prop
« Reply #10 on: Oct 19, 2010 »
 2 more
Jeff Lange
Sonerai I
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Buy the best and cry once - Gene Berg

eschrom

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Re: Another Cloudcar Prop
« Reply #11 on: Oct 20, 2010 »
Perty.

I'm glad a breeze didn't come along and blow your prop off the railing!

Ed

n3480h

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Re: Another Cloudcar Prop
« Reply #12 on: Oct 20, 2010 »
Very interested in a performance report.

Tom
Member, Taildragging Stick Monkey Association

Schmleff

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Re: Another Cloudcar Prop
« Reply #13 on: Oct 21, 2010 »
Bolted it on today. The bummer for me is that its 1/4" thicker than my Prince so I can't try it with the spinner on the plane.

I spun it up to 2900rpms static, 500rpms lower than the Prince. The Prince is a 48x50, the CC is a 52x56. I am going to fly it in the morning to see how it does in the morning, but I suspect that its just to much pitch.

FWIW, I have always recommended that new Sonerai owners not fly their plane with less than 3000rpms static. However, I am am not questioning the performance of my engine, which every new Sonerai owner/pilot should do. I have plenty of runway to work with but will have to pick a no-go point, something that I have never had to do with this plane before.

Please don't misunderstand, I still feel that a NEW Sonerai owner should not fly their plane if they see less than 3k.
Jeff Lange
Sonerai I
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Buy the best and cry once - Gene Berg

juergen

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Re: Another Cloudcar Prop
« Reply #14 on: Oct 22, 2010 »
I think, the diameter is too much: with the 52" the tips comes to supersonic at about 4000rpm. My new prop is 50" and with this diameter, the supersonic comes at 4200rpm (from ED Sterba's formula).
On my lasts test flys, I have seen that I need much more as normal linear power to increase the rpms from 3800 to 3900 to 4000 at cruise. I think, this much more needed power is the result of more aerodynamic drag on the prop tips at near supersonic.
I am very interesting about your test fly with the new prop, good luck.
with best regards
Juergen
(last night, we had 24°F: first time for this beginning wintertime :()
 

 

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