Questions and Answers If you have general RC questions or answers discuss it here.

Prop

Reply

Old 09-09-2017, 04:58 PM
  #1  
mashp39
Thread Starter
My Feedback: (1)
 
Join Date: Mar 2003
Location: THE VILLAGES, FL
Posts: 157
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Prop

What size prop for a 45 Super Tigre motor. I have been using a 10/6 on a Great Planes Cherokee kit plane. Would a 11/??? be better?
mashp39 is online now  
Reply With Quote
Old 09-09-2017, 08:40 PM
  #2  
Hydro Junkie
 
Join Date: Nov 2004
Location: Marysville, WA
Posts: 7,612
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

The best way to find out is the put one on and test. Just be sure you still have ground clearance before you taxi it to the runway
Hydro Junkie is offline  
Reply With Quote
Old 09-10-2017, 05:50 AM
  #3  
j.duncker
My Feedback: (2)
 
j.duncker's Avatar
 
Join Date: Jun 2004
Location: Sailing in the Eastern Caribbean
Posts: 4,042
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

I would suggest an APC 11 x 5 as a starting point.
j.duncker is offline  
Reply With Quote
Old 09-10-2017, 07:10 AM
  #4  
ronwc
My Feedback: (404)
 
ronwc's Avatar
 
Join Date: Jan 2002
Location: LARGO, FL
Posts: 494
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

11x6 is perfect
ronwc is offline  
Reply With Quote
Old 09-12-2017, 12:42 PM
  #5  
jaka
 
Join Date: Dec 2001
Location: Upplands Vasby, SWEDEN
Posts: 7,786
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Hi!
If you fly at sea level an 11x6 prop is the best size for most sportplanes with a .45 engine, but...prop brand is equally important!
Best props on the market performance vise is Graupner G-Sonic, APC, and RAM!
Attached Thumbnails Click image for larger version

Name:	tn_Skolflygplan Cherokee nos och motor.jpg
Views:	12
Size:	62.7 KB
ID:	2231681   Click image for larger version

Name:	Skolflygplan 004.jpg
Views:	9
Size:	386.8 KB
ID:	2231682   Click image for larger version

Name:	Skolflygplan 007.jpg
Views:	11
Size:	481.7 KB
ID:	2231683  
jaka is offline  
Reply With Quote
Old 09-13-2017, 04:47 AM
  #6  
Hydro Junkie
 
Join Date: Nov 2004
Location: Marysville, WA
Posts: 7,612
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Originally Posted by jaka View Post
Hi!
If you fly at sea level an 11x6 prop is the best size for most sportplanes with a .45 engine, but...prop brand is equally important!
Best props on the market performance vise is Graupner G-Sonic, APC, and RAM!
And that, in a nutshell, is why I said to take the props being considered and test Test TEST!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
There is no way to really know what a prop will do until you fly with it several times and chart the results
Hydro Junkie is offline  
Reply With Quote
Old 09-14-2017, 03:31 AM
  #7  
jester_s1
Moderator
 
Join Date: Dec 2006
Location: Fort Worth, TX
Posts: 6,662
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

What do you want to change about the flying characteristics? If you want better acceleration or more vertical performance, go with a bigger diameter prop with less pitch. If you want more speed, go smaller with more pitch. Going bigger and keeping the same pitch will slow the plane, make it quieter, and reduce the power output and fuel consumption of your engine. So what do you like or not like about the 10x6 that makes you want to try something different?
jester_s1 is offline  
Reply With Quote
Old 09-14-2017, 07:17 PM
  #8  
mashp39
Thread Starter
My Feedback: (1)
 
Join Date: Mar 2003
Location: THE VILLAGES, FL
Posts: 157
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

The 10/6 works very well. I was just wondering if anyone had any ideas about other props.I will try the 11/6 and a 11/7 just to note the difference. Sometimes to try something does result in a difference that is more to my liking.
mashp39 is online now  
Reply With Quote
Old 09-14-2017, 10:15 PM
  #9  
jaka
 
Join Date: Dec 2001
Location: Upplands Vasby, SWEDEN
Posts: 7,786
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Hi!
You can ofcourse use a any prop, including a 10x6 on a .45 engine. On a Q-500 type of plane with a span of 130cm a 10x6 is better but on a 140cm span Cheeroke a 11x6 is the prefered size.
Attached Thumbnails Click image for larger version

Name:	China-Clipper.JPG
Views:	9
Size:	151.7 KB
ID:	2232000   Click image for larger version

Name:	DSC01825.JPG
Views:	9
Size:	2.78 MB
ID:	2232001  
jaka is offline  
Reply With Quote
Old 09-26-2017, 03:57 PM
  #10  
mashp39
Thread Starter
My Feedback: (1)
 
Join Date: Mar 2003
Location: THE VILLAGES, FL
Posts: 157
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

I tried the 11/6 today and it did reduce the power output. The plane was not as responsive from 1/2 throttle to full and at 1/2 throttle it flew slower with a tail down attitude. On the second flight I went back to a 10/6 and the ST 45 opened up with more power and quicker from 1/2 to full throttle. I will stick with the 10/6 .Thanks for your comments. Testing did help but your input was interesting.
mashp39 is online now  
Reply With Quote
Old 09-27-2017, 06:40 AM
  #11  
jaka
 
Join Date: Dec 2001
Location: Upplands Vasby, SWEDEN
Posts: 7,786
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Hi!
What prop brand did you use? Did you adjust the needle?
jaka is offline  
Reply With Quote
Old 09-27-2017, 12:19 PM
  #12  
mashp39
Thread Starter
My Feedback: (1)
 
Join Date: Mar 2003
Location: THE VILLAGES, FL
Posts: 157
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

I adjusted the needle with the 11/6. It was a wooden prop. The 10/6 change caused a needle change also and it was a Master Airscrew prop. The 11/6 just seemed to lag with power from 1/2 throttle to full. The 10/6 just worked better for me.

Last edited by mashp39; 09-28-2017 at 06:34 PM. Reason: Not relevant to original problem.
mashp39 is online now  
Reply With Quote
Old 10-03-2017, 01:40 PM
  #13  
DGrant
My Feedback: (4)
 
DGrant's Avatar
 
Join Date: Dec 2001
Location: Clovis, CA
Posts: 1,927
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Not all props are created equal. You might try an APC prop in the same size, or maybe even a size up... I would honestly first try a 10x6 APC and see if that makes a diff. They're far stiffer then the Master Airscrews, and perform much better in my experience. An APC should rip pretty good compared to the Master.
DGrant is offline  
Reply With Quote
Old 10-04-2017, 05:00 PM
  #14  
buzzard bait
 
Join Date: Jan 2003
Location: Ithaca, NY
Posts: 3,276
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

APC makes a 10.5x6 that I like on an OS 46 AX; about 500 rpm less than the APC 10x6 with a little more diameter.
buzzard bait is offline  
Reply With Quote
Old 10-04-2017, 07:16 PM
  #15  
mashp39
Thread Starter
My Feedback: (1)
 
Join Date: Mar 2003
Location: THE VILLAGES, FL
Posts: 157
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Apc

I have used APC props and they do well. I think they break easier and the color doesn't appeal to me.I have painted them flat black with yellow tips and they look good but still break easier than MAS.I have everything packed for my move and it will be several weeks til I fly again but I will try the APC again. Thanks for your input. I enjoy getting a discussion going on this forum.
mashp39 is online now  
Reply With Quote
Old 10-06-2017, 12:56 PM
  #16  
DGrant
My Feedback: (4)
 
DGrant's Avatar
 
Join Date: Dec 2001
Location: Clovis, CA
Posts: 1,927
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Yes... an APC prop breaks easier then a MAS... that's a fact. A MAS prop will scuff/scratch/wear in many cases from a prop-strike.., where an APC will chip and/or just break from a simple prop strike... and I do always advise if an APC prop comes into any contact with the ground, toss it. They do also fracture and splinter.. and it can be undetectable until it explodes... I'm not knocking APC... I use them more then any other prop for small engines.. probably every plane.

It's up to you if you want more durability, or better performance. There's a point where you won't be as much concerned about the durability, and you'll want more performance.

When you get to the point that you're not breaking any props(regardless of brand)... then put the APC on it. Some of us haven't broken a prop in years... I usually break one maybe once every year or 2, not on the same planes though... I like to rotate my breakages.. . I have went years at times though with no problem... I do have a few planes that have the originally installed prop from well over 10yrs ago... Really it's a matter of just experience and learning.... just grease the landings as best you can... try to focus and concentrate.. don't carry on conversations when your flying or landing.. stuff like that... you can do it.
Good luck.

Last edited by DGrant; 10-06-2017 at 01:00 PM.
DGrant is offline  
Reply With Quote
Old 10-07-2017, 09:27 AM
  #17  
Mike360
 
Join Date: Jul 2007
Location: Southern CA
Posts: 60
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Hello everybody, I think the OP got some good answers and info now on a bit of a different side....I have said engine in a biplane and would like to "tone " it down. I am using an Xoar 11x6
now as I have a few for the other planes which are 4 cycles. But the ST45 is over powered to me and would like hopefully experienced help on the use of say a 12x4-5 prop on it. It's my Sportster
in my gallery if you need pic's I just found a prop at my local HS they are holding it .
Mike360 is offline  
Reply With Quote
Old 10-07-2017, 10:51 AM
  #18  
j.duncker
My Feedback: (2)
 
j.duncker's Avatar
 
Join Date: Jun 2004
Location: Sailing in the Eastern Caribbean
Posts: 4,042
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Originally Posted by Mike360 View Post
Hello everybody, I think the OP got some good answers and info now on a bit of a different side....I have said engine in a biplane and would like to "tone " it down. I am using an Xoar 11x6
now as I have a few for the other planes which are 4 cycles. But the ST45 is over powered to me and would like hopefully experienced help on the use of say a 12x4-5 prop on it. It's my Sportster
in my gallery if you need pic's I just found a prop at my local HS they are holding it .
Why not just pull back a little on the throttle stick.
j.duncker is offline  
Reply With Quote
Old 10-07-2017, 11:56 AM
  #19  
Mike360
 
Join Date: Jul 2007
Location: Southern CA
Posts: 60
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Originally Posted by j.duncker View Post
Why not just pull back a little on the throttle stick.

Thats what I've been doing. Don't get me wrong I just want it toned down alittle right now it seems like flying at just above idle to cruise.
At 3/4 its crazy fast and then if ya go full.....hoopdy tear the wings off. I'm think 12" to keep rpm's right and pitch to keep some verticle.
Mike360 is offline  
Reply With Quote
Old 10-08-2017, 02:59 PM
  #20  
buzzard bait
 
Join Date: Jan 2003
Location: Ithaca, NY
Posts: 3,276
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

I had an old BUSA Phaeton biplane with an Enya 45SS. I put a 12x4 prop on it and loved it that way. Slows down better on the back side of a loop, and it lands easy because it slows down better. Keep up a bit of throttle till you're close to the ground, then cut the throttle and it drops right in for a three point. Speed level was still way more than I needed. I think you've got the right idea. Jim
buzzard bait is offline  
Reply With Quote
Old 10-08-2017, 04:02 PM
  #21  
Mike360
 
Join Date: Jul 2007
Location: Southern CA
Posts: 60
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

buzzard we is cut from the same...I like it. Only prop manuf that seems to make a 4" is Xoar and hard to find....but my local is holding the last one of theirs for ME !!
I really just need to try'em
Mike360 is offline  
Reply With Quote
Old 10-08-2017, 07:07 PM
  #22  
buzzard bait
 
Join Date: Jan 2003
Location: Ithaca, NY
Posts: 3,276
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Mike, APC and MA also make them...https://www.towerhobbies.com/cgi-bin...?FVSEARCH=12x4

Good luck!
Jim
buzzard bait is offline  
Reply With Quote
Old 10-08-2017, 08:21 PM
  #23  
Mike360
 
Join Date: Jul 2007
Location: Southern CA
Posts: 60
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Thanks buzzard, I try to stay away from the composites, although I've had good luck with the glass MA's
Mike360 is offline  
Reply With Quote
Old 10-14-2017, 05:00 AM
  #24  
jaka
 
Join Date: Dec 2001
Location: Upplands Vasby, SWEDEN
Posts: 7,786
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Hi!
MA props are the worst props there are! Both sound wise and performing wise.
Best props are Graupner G-Sonic, RAM and APC.
jaka is offline  
Reply With Quote
Old 10-14-2017, 07:51 AM
  #25  
Mike360
 
Join Date: Jul 2007
Location: Southern CA
Posts: 60
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Originally Posted by jaka View Post
Hi!
MA props are the worst props there are! Both sound wise and performing wise.
Best props are Graupner G-Sonic, RAM and APC.
Just so ya know, I don't have any real experience with glass props had
one MA and it got the plane in the air...I fly wood exclusively.
Mike360 is offline  
Reply With Quote

Thread Tools
Search this Thread

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service