Thread Tools
This thread is privately moderated by phil alvirez, who may elect to delete unwanted replies.
Nov 08, 2014, 12:07 AM
Registered User
Thread OP
Data

trimming the umx radian


https://www.rcgroups.com/forums/show....php?t=2089760
what works for me
for all that i have learned about it:
1.-place the cell (so-called battery) at 1/3 wing chord and then fly it:
2.- if it takes a few clicks to fly right (3-4):
3.- just shift the cell until takes zero trim;
4.- but if it needs more, then it needs changing decalage (please note: decalage, not decolage):
5.-if trim gives elevator up, it needs less stab incidence (decrease angle of attack-raise trailing edge or decrease leading edge);
6.-or the opposite: if trim gives elevator down, it needs more stab incidence (increase angle of attack of stab-lower trailing edge or raise leading edge).
to modify decalage:
7.-if needs less stab incidence, remove a thin layer from the join of the top fuselage where it matches the tail.
8.-if needs more stab incidence, insert a thin layer at the join.
(these are paper thin adjustments)
9.-do 1 at a time and test fly until it does not need trim (zero=elevator neutral).
Last edited by phil alvirez; Nov 08, 2014 at 07:21 AM.
Sign up now
to remove ads between posts


Quick Reply
Message:
Thread Tools