RE: Props-More Myths Busted  
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RE: Props-More Myths Busted - 7/31/2007 1:00:56 AM   
Flyboy Dave



Posts: 13449
Joined: 3/20/2002
From: San Bernardino County, CA, USA
Status: offline 		....it's real east to say the APC props are better, but much harder to prove. As we can see
in the above test by yallaair, the 14-6 APC got it's butt whooped by a run of the mill wooded
prop. Lost by 5 mph in the air. So much for superior design.

quote:

The Rev-up props that were mentioned earlier were much more refined than the Zinger,
and were prized by the early electric flight modelers because of their higher efficiency.


...hmmm, where are the wonderfully "prized, higher effeciency" Rev-up's now ? Out of business ?

Darn.

Let the myth's continue.

FBD.

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An engineer says.... "That won''t work".
A mechanic says..."Oh yeah, watch this".
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       Post #: 326

RE: Props-More Myths Busted - 7/31/2007 1:48:20 AM   
HighPlains


 

Posts: 2664
Joined: 3/2/2003
From: Over da rainbow, KS, USA
Status: offline 		Perhaps you lack comprehension of the subtle nuance the English language offers.

As far as Rev-Up goes, Chris Machin started the business in the late 40's and ran it for close to 50 years. The pylon props that you referred to (that most racers used for several decades) were Rev-Up's.

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       Post #: 327

RE: Props-More Myths Busted - 8/1/2007 8:11:06 AM   
Flyboy Dave



Posts: 13449
Joined: 3/20/2002
From: San Bernardino County, CA, USA
Status: offline 		....it looks like the lads are still excited about using wood props for racing....Zingers.

Yes, Zingers were, and still are excellant props. Save a finger....use a Zinger.

http://www.rcuniverse.com/forum/m_5490109/mpage_1/key_/tm.htm

FBD.

_____________________________

An engineer says.... "That won''t work".
A mechanic says..."Oh yeah, watch this".
"Old Age, and Treachery will overcome youth and skill".
Revver Bro #4.

(in reply to HighPlains)
       Post #: 328

RE: Props-More Myths Busted - 8/1/2007 1:48:44 PM   
Sport_Pilot



Posts: 7718
Joined: 1/21/2002
From: Acworth, GA, USA
Status: offline 		When the Zingers first came out, I recall they were better than the Rev-Up's that many exclaim. But I guess we forget these things with time.

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       Post #: 329

RE: Props-More Myths Busted - 8/2/2007 1:05:23 AM   
RVM


 

Posts: 1975
Joined: 3/12/2006
From: Sacramento, CA, USA
Status: offline 		I am using a laminated Xoar 15x6 on my Saito 1.00 and love it.

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       Post #: 330

RE: Props-More Myths Busted - 8/2/2007 5:33:41 AM   
XJet


 

Posts: 3454
Joined: 3/31/2003
From: Tokoroa, NEW ZEALAND
Status: offline
quote:

ORIGINAL: RVM

I am using a laminated Xoar 15x6 on my Saito 1.00 and love it.


I tried a wooden (Volk) 15x6 on my Saito 100 and it *didn't * like it at all.

It knocked like a demon -- and I was only using 10% fuel.

I suspect it was simply too light (the Volk props are very light) and not providing enough flywheel effect. Sure flew nice though -- but it was so scary to listen to that I only flew 1/2 a tank of fuel on it before changing back to a regular prop.



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       Post #: 331

RE: Props-More Myths Busted - 8/2/2007 12:29:55 PM   
jaka


 

Posts: 4526
Joined: 12/11/2001
From: Upplands Vasby, SWEDEN
Status: offline 		Hi!
Change your fuel and the nocking will disaper! ...Or set the engine a little richer!

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(in reply to XJet)
       Post #: 332

RE: Props-More Myths Busted - 8/2/2007 4:50:28 PM   
djlyon



Posts: 1941
Joined: 12/10/2001
From: Castaic, CA, USA
Status: offline 		Boy the legs this daffy thread has is unbelievable. How do you do it Flyboy?

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       Post #: 333

RE: Props-More Myths Busted - 8/2/2007 4:55:02 PM   
Clark L



Posts: 147
Joined: 1/22/2003
From: So-Cal, USA
Status: offline 		Nothing about a Q40 prop carved from a Zinger blank resembles the original Zinger...

... and exactly how will you "save a finger"? Stick your finger in that wood prop and you wont have a finger any more than if you put it into a C/F or nylon prop.


(in reply to Flyboy Dave)
       Post #: 334

RE: Props-More Myths Busted - 8/2/2007 6:14:17 PM   
scratchonly


 

Posts: 946
Joined: 6/3/2006
From: winnipeg, MB, CANADA
Status: offline 		Years ago I stuck my finger into a top flite 11x7 prop. It cut my finger but the prop broke!

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       Post #: 335

RE: Props-More Myths Busted - 8/2/2007 6:39:27 PM   
Flyboy Dave



Posts: 13449
Joined: 3/20/2002
From: San Bernardino County, CA, USA
Status: offline
quote:

ORIGINAL: Clark L

... and exactly how will you "save a finger"? Stick your finger in that wood prop and you
wont have a finger any more than if you put it into a C/F or nylon prop.




....a great new prop myth....THANK YOU !!!


_____________________________

An engineer says.... "That won''t work".
A mechanic says..."Oh yeah, watch this".
"Old Age, and Treachery will overcome youth and skill".
Revver Bro #4.

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       Post #: 336

RE: Props-More Myths Busted - 8/2/2007 7:48:30 PM   
proptop



Posts: 4497
Joined: 10/18/2002
From: Rome, NY, USA
Status: offline 		There's another "leg" to keep this thread going...and going...(Energizer Bunny style )

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       Post #: 337

RE: Props-More Myths Busted - 8/2/2007 10:17:52 PM   
XJet


 

Posts: 3454
Joined: 3/31/2003
From: Tokoroa, NEW ZEALAND
Status: offline
quote:

ORIGINAL: jaka
Change your fuel and the nocking will disaper! ...Or set the engine a little richer!


Don't worry, I tried all the usual things including:

1. richened it up (didn't help at all)
2. checked that the propnut wasn't bottoming on the thread and thus not clamping the prop sufficiently

The fuel is only 10% nitro and my Saito 100 and Saito 82 run fine on it with every other prop. Since Saitos will happily digest up to 30% nitro I don't think fuel was the problem.

When I put the other prop back on it was fine.

RPMs were the same with both props.

All I can think of is the lack of flywheel effect -- the APC prop is *heavy*, the Volk is *light*.


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       Post #: 338

RE: Props-More Myths Busted - 8/3/2007 3:23:43 AM   
Sport_Pilot



Posts: 7718
Joined: 1/21/2002
From: Acworth, GA, USA
Status: offline 		Likely the Volk prop moved more air, which loaded the engine more, which caused it to detonate. It's odd but if the prop is more efficient and moves more air then this loads the engine down and it turns less RPM. Course it could also be that the prop has more drag which also loads the engine down without moving more air.

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       Post #: 339

RE: Props-More Myths Busted - 8/3/2007 3:36:35 AM   
blw



Posts: 4562
Joined: 3/15/2004
From: Auburn, AL, USA
Status: offline 		Sport Pilot- you have that backwards.

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       Post #: 340

RE: Props-More Myths Busted - 8/3/2007 3:53:54 AM   
Sport_Pilot



Posts: 7718
Joined: 1/21/2002
From: Acworth, GA, USA
Status: offline 		No, if you ta