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

Prop size

Old 09-06-2015, 11:22 AM
  #1  
cran
Junior Member
Thread Starter
 
Join Date: Mar 2013
Location: Norfolk, VA
Posts: 4
Likes: 0
Received 0 Likes on 0 Posts
Default Prop size

I have a Hanger 9, P-47, with a Satio FA 100 in it. It seems to come in too fast for landings at an idle. The prop size that I have on it now is a 14x8. Should I go to a 15x6 or 14x6 prop to help slow the plane down for landings?
Old 09-06-2015, 02:22 PM
  #2  
bhady
 
Join Date: Sep 2003
Location: Fairmont, MN
Posts: 274
Likes: 0
Received 1 Like on 1 Post
Default

I'd try the 15X6, the larger prop disc will create some drag at low RPM and help you slow the plane down. It may also help vertical performance.
Old 09-06-2015, 03:14 PM
  #3  
speedracerntrixie
My Feedback: (29)
 
speedracerntrixie's Avatar
 
Join Date: Jun 2010
Location: Happy Valley, Oregon
Posts: 7,887
Received 54 Likes on 52 Posts
Default

The #1 cause for a fast landing airplane is being too nose heavy.
Old 09-06-2015, 04:42 PM
  #4  
cran
Junior Member
Thread Starter
 
Join Date: Mar 2013
Location: Norfolk, VA
Posts: 4
Likes: 0
Received 0 Likes on 0 Posts
Default

Thanks for the help, I will try the larger prop and recheck my balance, Thanks again.
Old 09-07-2015, 04:11 AM
  #5  
Greg Wright
My Feedback: (6)
 
Greg Wright's Avatar
 
Join Date: Sep 2008
Location: Illinois
Posts: 2,243
Likes: 0
Received 5 Likes on 5 Posts
Default

Does the it have flaps?

Last edited by Greg Wright; 09-07-2015 at 04:19 AM.
Old 09-07-2015, 01:20 PM
  #6  
JPMacG
My Feedback: (2)
 
Join Date: Jan 2002
Location: Ivyland, PA
Posts: 2,278
Likes: 0
Received 0 Likes on 0 Posts
Default

14x6 is not enough prop in my opinion. I would try a 15x6. I have a 14x10 on my Aeromaster with a Saito 100. I need the pitch to keep the RPM down to meet my fields sound limit. With the 14x10 I have to fly it onto the ground. It will keep on flying with the engine at idle.
Old 09-07-2015, 03:45 PM
  #7  
cran
Junior Member
Thread Starter
 
Join Date: Mar 2013
Location: Norfolk, VA
Posts: 4
Likes: 0
Received 0 Likes on 0 Posts
Default

Hi Greg, This is the Hanger 9 ARF P-47 that was out 5 or 6 years ago. No flaps just ailerons.
Old 09-08-2015, 11:52 AM
  #8  
jaka
 
Join Date: Dec 2001
Location: Upplands Vasby, SWEDEN
Posts: 7,815
Likes: 0
Received 1 Like on 1 Post
Default

Hi!
As the others have said_14x6 is too small. 15x6 or perhaps 16x4.
And check the Cof G! Nose heavy planes tend to land fast.

Last edited by jaka; 09-15-2015 at 11:14 AM.
Old 09-08-2015, 01:35 PM
  #9  
j.duncker
My Feedback: (2)
 
j.duncker's Avatar
 
Join Date: Jun 2004
Location: Sailing in the Eastern Caribbean
Posts: 4,047
Likes: 0
Received 0 Likes on 0 Posts
Default

Something I have done when faced with a similar situation is to reduce the idle on thew final leg. I would often just use the throttle trim as i was comfortable doing this and would count the beeps.

But with a modern computer radio it is usually possible to attach the lower idle to a switch.
Old 09-08-2015, 03:13 PM
  #10  
Gray Beard
My Feedback: (-1)
 
Join Date: Apr 2003
Location: Hemderson, NV
Posts: 14,385
Likes: 0
Received 2 Likes on 2 Posts
Default

As speed said, it is usually more of a CG thing then the prop. Still, the only way to tell what prop you like is by testing. And when testing don't forget the three blade props. The 14 is not too small of a prop but it may be too small for that combo. I don't often use a three blade but they are like putting on the breaks when you cut power. I also have the three way switch set up like JD mentioned. Up is a high idle I use to start and while in the air, center is very low for while in the pits or taxi/landing and down is kill. Works for me.
Old 09-08-2015, 04:24 PM
  #11  
cran
Junior Member
Thread Starter
 
Join Date: Mar 2013
Location: Norfolk, VA
Posts: 4
Likes: 0
Received 0 Likes on 0 Posts
Default

Thanks to all that have replied to my question. I have changed the prop to a 15x6 and will check the CG as time allows. This week end looks like a rain out so I will have to wait until next week end to test fly, Thanks again to all replies.

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 - Do Not Sell My Personal Information -

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.