Zinger Pro vs Zinger Regular  
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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Glow Engines >> Zinger Pro vs Zinger Regular
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Zinger Pro vs Zinger Regular - 10/10/2002 2:43:10 AM   
smartwork


 

Posts: 210
Joined: 8/23/2002
From: USA
Status: offline 		Other than the shape which I understand to affect volume/sound, what's the difference between the Zinger Pro props and the Zinger Regular props?

-shaun
       Post #: 1

Zinger - 10/10/2002 10:42:02 PM   
U. S. Male


 

Posts: 1
Joined: 10/10/2002
From: Ravea Springs, Fl
Status: offline 		Other than costing a little more for the pro version, it seems to be more effiecent or so i've heard.

_____________________________

Better not mess with the U.S. Male

(in reply to smartwork)
       Post #: 2

reg. vs. pro - 10/10/2002 11:03:40 PM   
tsaldivar


 

Posts: 107
Joined: 9/21/2002
From: escondido, CA, USA
Status: offline 		Shape has EVERYTHING to do with it!
Rpm's will increase, performance WILL increase, and the smiles will increase!
It's a win-win situation!

The other thing to remember is that Composite props(solid) even though shaped more efficiently can some times be too heavy too really see all around increase in performance. The hollow carbon props really help in this arena!

Do yourself a favor and TRY the pro props if you have them.

Remember, theres a GOOD reason that the pro's use the BETTER props! It's not just looks.

(in reply to smartwork)
       Post #: 3

Zinger Pro vs Zinger Regular - 10/10/2002 11:27:02 PM   
smartwork


 

Posts: 210
Joined: 8/23/2002
From: USA
Status: offline 		Thanks for the replies. I actually have the Pro prop now and am about to experiment with the non-pro prop as part of a test to help eliminate some engine burble in a gasser. Another RCU member recommended loading the engine a little more and locally there was only a non-pro prop available so I'll give it a test, but have never heard anyone say exactly what the differences were.

I've got a 20x8 Pro on now and will be adding a 22x6 non-pro to see the difference in engine-loading. Would have preferrred the 22x8 but wasn't immediately available so will give the 6 a try to see if the step up in 2" will still load the engine a little more even though I'm giving up the pitch a little. I might be about a wash and not be any different but I'll test it just to see.

Thanks!

-shaun

(in reply to smartwork)
       Post #: 4

props - 10/10/2002 11:28:56 PM   
tsaldivar


 

Posts: 107
Joined: 9/21/2002
From: escondido, CA, USA
Status: offline 		Which gas engine? and size?

(in reply to smartwork)
       Post #: 5

Zinger Pro vs Zinger Regular - 10/11/2002 12:48:13 AM   
smartwork


 

Posts: 210
Joined: 8/23/2002
From: USA
Status: offline 		Brison 2.4 - runs great, but trying to clean up the mid-range burble that quite a few people seem to have and seems to be in the transition point that the Low needle can't quite hit. Here's a thread about our discussion about it that includes solutions such as burdening the engine a little more to lean that point out as well as solutions of changing diaphram pressure:

http://www.rcuniverse.com/forum/tm.asp?m=34616

So, I thought I would start with the simple test... change of prop. Spoke with one fellow and he had the EXACT same richness problem at the mid point and he said that did the trick for him. rcign (an RCU member) also suggested this so I'll give it a shot. I may have to jump to the 22x8 which I would have preferred for the test but the 22x6 was available first so I'll try it.


-shaun

(in reply to smartwork)
       Post #: 6

props - 10/11/2002 12:57:46 AM   
tsaldivar


 

Posts: 107
Joined: 9/21/2002
From: escondido, CA, USA
Status: offline 		Justwatch the PITCH of the "said" prop!

(in reply to smartwork)
       Post #: 7

Zinger Pro vs Zinger Regular - 10/11/2002 1:16:29 AM   
smartwork


 

Posts: 210
Joined: 8/23/2002
From: USA
Status: offline 		The 6 pitch?

-shaun

(in reply to smartwork)
       Post #: 8

props - 10/11/2002 1:25:21 AM   
tsaldivar


 

Posts: 107
Joined: 9/21/2002
From: escondido, CA, USA
Status: offline 		This doesn't seem correct when trying to "fix" a burble issue with a prop, maybe the carb should be examined.

Sometimes the vortex, or swirling air that has entered the cowling is actually changing the mixture in the carb and causes this phenomenon. A velocity stack, or controlled blocking of the air flow to the intake especially at the diaphram cover plate where the small breather hole is, can make the difference.

In regards to the prop pitch, larger diameter is o.k., just remember that the pitch needs to be dropped down to compensate for the larger load, or size that it will see.

Hope this helps!

(in reply to smartwork)
       Post #: 9

Zinger Pro vs Zinger Regular - 10/11/2002 2:01:03 AM   
smartwork


 

Posts: 210
Joined: 8/23/2002
From: USA
Status: offline 		Yep, the drop to the 6 when jumping to the 22 should well compensate for the jump in diameter (additional load). As for the pressure & wind inside the cowl, yes I'm also looking at the various proposed solutions to that. I contacted on modeler who pointed out a cool device for 3W engines that is more or less an elbow intake that faces backwards. The elbow also has a tapped outlet that is connected to the diaphram in order to control that pressure as well.

If the prop doesn't help work out the burble, I'll investigate that device as well as running a diaphram vent to the fuse and all the other suggestions. I'll knock them out one at a time and probably leave redrilling carb parts until last :

The engine runs great! I just also want that really smooth transition if its available and the engine is on the edge of giving that to me.

-shaun

(in reply to smartwork)
       Post #: 10

Zinger Pro vs Zinger Regular - 10/11/2002 3:23:29 AM   
seanychen



Posts: 2914
Joined: 7/20/2002
From: Canton, MI, USA
Status: offline 		Is the airfoil different between the Zinger "Ammateur" and Zinger "Pro"?

The shape is critical, especial around the tip. This is where the boundary between thrust zone and ambient air. If the transition is not smooth, turbulence would increase exponentially, and a lot of energy would be lost, usually in the form of dropped rpm. Therefore, APC props, w/ smooth transition from "meaty" section to the tip, usually result in higher rpm than those w/ square tip like "Slave Airscrew" and Zinger Ammateur.

There is a new design that has a flange at the tip. It's *supposed* to separate the thrust zone's airflow from the ambient air, thus reducing turbulence. I saw such a prop on a large aerobatic plane. I don't know how it does though.

(in reply to smartwork)
       Post #: 11

Zinger Pro vs Zinger Regular - 10/11/2002 3:33:03 AM   
seanychen



Posts: 2914
Joined: 7/20/2002
From: Canton, MI, USA
Status: offline 		Another thing, the extra mass of composite prop usually affect the "acceleration", or "spin up" response. As far as top end rpm and power, weight doesn't make ANY difference once the top rpm is eventually reached, because:

Torque = C(drag factor) * rpm + I(moment of inertia) * Alpha (angular acceleration).

So large APC props will still give you respectable top-end power; it will just take a while to get there.

(in reply to smartwork)
       Post #: 12

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