Giant Scale Aircraft - General Discuss all other giant scale aircraft here.

Prop types

Reply

Old 12-06-2017, 09:45 AM
  #1  
mckibben
Member
Thread Starter
 
Join Date: Feb 2006
Location: Versailles, OH
Posts: 78
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Cool Prop types

I am putting together a extra 330 78" wing span. running a da 35. and a 20x10 prop to start with. My first time with a bigger airplane. I have been flying for 11 years now
We fly off of grass at the club field. Wood props do not last long out there. I have seen the carbon ones. Can I use a master airscrew or an apc prop with this setup?
Any advice would be a great help.
mckibben is offline  
Reply With Quote
Old 12-06-2017, 09:55 AM
  #2  
BarracudaHockey
My Feedback: (11)
 
BarracudaHockey's Avatar
 
Join Date: Jul 2003
Location: Jacksonville, FL
Posts: 22,558
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Yuck on the MAS or APC on a gas engine.

If you want a good prop get a Falcon Carbon at whatever size you intend to fly
BarracudaHockey is online now  
Reply With Quote
Old 12-06-2017, 10:01 AM
  #3  
BarracudaHockey
My Feedback: (11)
 
BarracudaHockey's Avatar
 
Join Date: Jul 2003
Location: Jacksonville, FL
Posts: 22,558
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Also, 20x10 really drags the top end down, I'd get a 20x8 falcon personally or a 19x10 if i were putting it on a warbird
BarracudaHockey is online now  
Reply With Quote
Old 12-06-2017, 01:56 PM
  #4  
ahicks
My Feedback: (2)
 
Join Date: Aug 2008
Location: Waterford, Mi/Citrus Springs, Fl
Posts: 3,621
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

APC makes a 20x8w (wide) prop that I used to use at a pretty rough field I used to fly at. That's a big heavy prop, but I was tired of breaking the wood, and CF props are expensive! Agree with Barracuda. 10" pitch is likely a bit much for an acrobat. Might be better used on a really clean military type that's not looking for the vertical performance an acrobat might be looking for.
ahicks is offline  
Reply With Quote
Old 12-06-2017, 04:39 PM
  #5  
jetmech05
 
Join Date: Jul 2005
Location: Jacksonville, FL
Posts: 4,838
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default No to mas

master air screw are just terrible. Too much flex in the blades. I'd never run an APC on a gasser too sharp you outta see the scars on my fingers from an APC on a 1.60.
​​​​​​​i agree with Andy Falcon carbon fiber
jetmech05 is offline  
Reply With Quote
Old 12-06-2017, 05:46 PM
  #6  
All Day Dan
My Feedback: (5)
 
All Day Dan's Avatar
 
Join Date: Dec 2002
Location: MANHATTAN BEACH, CA
Posts: 4,572
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

I've been using wood Master Airscrew 20X10's for many years with a 50cc engine with no problems. They shatter on prop strikes protecting the engine during abrupt stoppages. Dan.
All Day Dan is offline  
Reply With Quote
Old 12-07-2017, 02:36 AM
  #7  
TomCrump
 
TomCrump's Avatar
 
Join Date: Apr 2003
Location: Traverse City, MI
Posts: 7,511
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Originally Posted by All Day Dan View Post
I've been using wood Master Airscrew 20X10's for many years with a 50cc engine with no problems. They shatter on prop strikes protecting the engine during abrupt stoppages. Dan.
Yup. I use the same reasoning. I'd rather break a prop than bend a crank.
TomCrump is offline  
Reply With Quote
Old 12-07-2017, 04:41 AM
  #8  
ahicks
My Feedback: (2)
 
Join Date: Aug 2008
Location: Waterford, Mi/Citrus Springs, Fl
Posts: 3,621
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Originally Posted by jetmech05 View Post
master air screw are just terrible. Too much flex in the blades. I'd never run an APC on a gasser too sharp you outta see the scars on my fingers from an APC on a 1.60.
​​​​​​​i agree with Andy Falcon carbon fiber
That's why God invented sandpaper. Anyone running APC and flip starting an engine, from .60 on up, generally figures that out pretty quickly.
ahicks is offline  
Reply With Quote
Old 12-07-2017, 09:16 AM
  #9  
mckibben
Member
Thread Starter
 
Join Date: Feb 2006
Location: Versailles, OH
Posts: 78
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Thank you for all the info. I will get a 20x8 prop. As for flipping the prop I will be using a rolling chicken stick. or something like that. I am minus half of my pinky finger from getting my hand in the prop. Cut it clean off. As for apc props. We all use them on our nitro planes. And sand the edges before using them. The props can be low to the ground. Wood props do not break. But they chip from the grass. But I have hit the ground with the apc prop on my nitro planes and cracked the firewall. Nose over after landing.
mckibben is offline  
Reply With Quote
Old 12-08-2017, 08:22 AM
  #10  
jetmech05
 
Join Date: Jul 2005
Location: Jacksonville, FL
Posts: 4,838
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default It wasn't the back side

It wasn't the backside of the prop that got me....I got in a hurry to get a flight in between showers. Forgot to retard the throttle
jetmech05 is offline  
Reply With Quote
Old 12-16-2017, 04:54 PM
  #11  
DGrant
My Feedback: (4)
 
DGrant's Avatar
 
Join Date: Dec 2001
Location: Clovis, CA
Posts: 1,898
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

If your getting prop strikes, the grass might need to be shorter... or your technique needs a little work... probably a bit of both... If it's an established club with a grass runway, is everybody breaking/chipping props?... If not find out what/how they're keeping them in one piece. The prop shouldn't be striking, or mowing the grass though if the grass is short enough...so I'd start there.

Honestly though, I wouldn't spend the money on a carbon fiber prop until you're greasing landings in every time. A c/f prop will still shatter, just as easily as any other prop... and it will cost alot more then wood prop to replace... probably more then 4 times what a wood prop is. I'm not sure the answer to your problem is in the prop actually...

For a decent wood prop try Xoar props from Tower Hobbies. I found them very good quality, nicely stiff, and really a nice addition to my planes as wood props go. If you stepped up into a performance prop, therein is where a carbon fiber prop would be an advantage, as they are stiffer, lighter, spool up faster, etc... but they're not just to get more durability... and they still break, not to mention the cost factor...

Props aren't supposed to hit anything other then air, so if you strive for that, that would definitely help the situation. You can do it too. Many of us keep props on indefinitely. I've got one plane that's had the same prop on it for 15yrs(a 50cc plane)... and they just don't wear out... it just works like that. Go figure. Good luck with it.
DGrant is offline  
Reply With Quote
Old 12-19-2017, 05:09 PM
  #12  
mgnostic
 
mgnostic's Avatar
 
Join Date: Jan 2003
Location: Kamay, TX
Posts: 904
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Having flown from hay pastures I can sympathize with McKibben. We don't always have the opportunity to fly from a manicured field. I watched a student having difficulty taking off despite making good rpms. When he taxied the plane back the bermuda grass had abraded away so much of the blade area that he couldn't reach take off speed. MAS may not offer the peak of performance but they are more resistant to running through grass.
mgnostic is offline  
Reply With Quote

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service