motor upthrust Monolog 400 ep - WattFlyer RC Electric Flight Forums - Discuss radio control eflight

Aerodynamics Discuss the concepts of aerodynamics here

motor upthrust Monolog 400 ep

Old 01-27-2016, 09:49 AM
  #1  
Ratboy
New Member
Thread Starter
 
Join Date: Nov 2007
Posts: 1
Default motor upthrust Monolog 400 ep

MONOLOG 400 UPTHRUST
just acquired the above model maiden flight last weekend inverted it wants to head to mother earth checked other pics of the model on the net and looks no different to my model a check with digital meter confirms about 2 degrees of up thrust wing is about 1 degree this does not like flying inverted looks like the motor box will have to have some surgery to correct the upthrust
Ratboy is offline  
Old 01-27-2016, 11:48 AM
  #2  
solentlife
Super Contributor
 
solentlife's Avatar
 
Join Date: Oct 2010
Location: Ex UK Brit now in Latvia west coast - Ventspils
Posts: 12,359
Default

Is it this model :



Then I would expect it to have either zero up / down thrust on motor or just a small 1 - 2deg down. I would not expect to see UP thrust on such a machine.

Couple of washers under mount screws should help ?

Nigel
solentlife is offline  
Old 01-27-2016, 12:22 PM
  #3  
JetPlaneFlyer
Super Contributor
 
JetPlaneFlyer's Avatar
 
Join Date: Mar 2009
Location: Aberdeen, Scotland
Posts: 6,120
Default

Up thrust relative to what datum?

Using the wing chord line as your datum is the only sensible option on a model such as this. If the wing is 'about' 1 degree and the motor is 'about' 2 degrees.. then that sounds to me like they are 'about' the same (within a degree or less)? .. so 'about' zero up thrust.

Diving strongly when inverted usually points to your CG being too far forward. If it were mine I'd try moving the battery back, re trimming elevator for level upright flight then repeat the inverted test. Keep repeating until you get the inverted behaviour you are after.

nice looking model by the way......
JetPlaneFlyer is offline  
Old 01-27-2016, 05:09 PM
  #4  
fhhuber
Super Contributor
 
fhhuber's Avatar
 
Join Date: Mar 2013
Posts: 4,786
Default

Yep

Sounds to me like a CG issue.
fhhuber is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Murocflyer
Scratch and Kit Built Aircraft
3
07-29-2013 04:54 AM
dheaton
Power Systems
7
12-09-2012 05:22 AM
schusterjo
General Electric Discussions
0
10-09-2011 04:25 AM
Hose Man
Beginners
7
03-23-2011 02:57 PM

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
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


Quick Reply: motor upthrust Monolog 400 ep


Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

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

Page generated in 0.05583 seconds with 15 queries