Notices
RC Pattern Flying Discuss all topics pertaining to RC Pattern Flying in this forum.

Soft mount and engine movement

Old 09-29-2016, 04:55 AM
  #1  
kenh3497
Thread Starter
 
kenh3497's Avatar
 
Join Date: Jan 2010
Location: Rockwell, IA
Posts: 1,508
Likes: 0
Received 0 Likes on 0 Posts
Default Soft mount and engine movement

How much rotational movement will a YS 140 have on a Hyde soft mount? I want to build some air dams to control air movement over the engine. I have no experience with soft mounted engines. Thank you.

Ken
Old 09-29-2016, 05:39 AM
  #2  
flywilly
My Feedback: (121)
 
Join Date: Feb 2002
Location: glen allen, VA,
Posts: 2,160
Likes: 0
Received 6 Likes on 6 Posts
Default

Hi Ken,
It depends on which mount used. Typically there is ring to 'capture' movement at the drive washer, either part of the mount or attached to the front of the fuselage. This limits actual movement. Check out the Hyde mounts shown here: https://www.centralhobbies.com/cat3....=31&subcat=143
-Will
Old 09-29-2016, 06:25 AM
  #3  
kenh3497
Thread Starter
 
kenh3497's Avatar
 
Join Date: Jan 2010
Location: Rockwell, IA
Posts: 1,508
Likes: 0
Received 0 Likes on 0 Posts
Default

I have the nose ring. I'm just curious how much the engine will rotate on the mount. How much will the valve cover move right to left.

Ken
Old 09-29-2016, 11:17 AM
  #4  
flywilly
My Feedback: (121)
 
Join Date: Feb 2002
Location: glen allen, VA,
Posts: 2,160
Likes: 0
Received 6 Likes on 6 Posts
Default

I have allowed +/- 1/8" and not had contact problems, but that can be cutting it pretty close. You can always make the clearance larger, but it is more work to make the holes smaller.
Old 09-29-2016, 03:45 PM
  #5  
kenh3497
Thread Starter
 
kenh3497's Avatar
 
Join Date: Jan 2010
Location: Rockwell, IA
Posts: 1,508
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by flywilly View Post
I have allowed +/- 1/8" and not had contact problems, but that can be cutting it pretty close. You can always make the clearance larger, but it is more work to make the holes smaller.
OK thanks!

The engine is contained wholly within the cowl so I just need to add the air dams. They will be attached to the bottom cowl half so I don't want the engine banging into them and destroying the slightly fragile cowl mounts.

Ken
Old 09-29-2016, 06:34 PM
  #6  
bandicootf16
 
Join Date: Dec 2010
Location: AUSTRALIA
Posts: 72
Likes: 0
Received 0 Likes on 0 Posts
Default

Hi Ken

You could make the dams from foam rubber/plastic aka CPLR style.



David
Attached Thumbnails Click image for larger version

Name:	DSC06420.JPG
Views:	321
Size:	390.6 KB
ID:	2183496  
Old 09-29-2016, 07:36 PM
  #7  
kenh3497
Thread Starter
 
kenh3497's Avatar
 
Join Date: Jan 2010
Location: Rockwell, IA
Posts: 1,508
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by bandicootf16 View Post
Hi Ken

You could make the dams from foam rubber/plastic aka CPLR style.



David

OH, that will never work. LOL.

That's a good idea. I'll look around and see what I can scare up in the black hole under my workbench.

Ken
Old 09-29-2016, 08:19 PM
  #8  
bandicootf16
 
Join Date: Dec 2010
Location: AUSTRALIA
Posts: 72
Likes: 0
Received 0 Likes on 0 Posts
Default

And the other side

Attached Thumbnails Click image for larger version

Name:	DSC06418.JPG
Views:	217
Size:	345.9 KB
ID:	2183501  
Old 09-30-2016, 03:07 PM
  #9  
apereira
 
apereira's Avatar
 
Join Date: Jun 2002
Posts: 1,689
Received 1 Like on 1 Post
Default

Foam is the best way, if your engine goes lean in flight and "kick" that will make the engine turn as much as 1/2".
Old 09-30-2016, 05:51 PM
  #10  
kenh3497
Thread Starter
 
kenh3497's Avatar
 
Join Date: Jan 2010
Location: Rockwell, IA
Posts: 1,508
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by apereira View Post
as much as 1/2".

Oh My! I would never have guessed that much. I'll have to make sure to tune carefully and never run out of fuel. Thank you

Ken
Old 10-02-2016, 07:00 AM
  #11  
David Bathe
 
David Bathe's Avatar
 
Join Date: Mar 2008
Location: Oslo, NORWAY
Posts: 1,243
Likes: 0
Received 4 Likes on 3 Posts
Default

Not only can the engine flex sideways 1cm or so, it'll also stretch forward 0.5-1mm depending on the exact type of hyde. This mean you can get some throttle servo binding at full chat, which of course you won't be able to hear but it will take your battery down some. Set up the throttle servo accordingly to allow for the very last ounce of movement to be delivered with full throttle/mount stretch.
A wonderful, happy, friendly and low maintenance YS the 1.40.

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 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.