New Products Flash Sale
Thread Tools
Old May 16, 2003, 10:08 AM
wilerbee is offline
Find More Posts by wilerbee
Registered User
Hong Kong
Joined Jan 2002
862 Posts
Side thrust and up/down thrust for pushers

Hi all,

I am building a Mirage 3 wood kit, it is for a .46 to .61 pusher engine but the plans do not show the amount of side thrust and down thrust. My question is should the the side thrust be left thrust and down thrust be up thrust and how much of it ? Any help on enlightening me will be greatly appreciated.

wilerbee is offline Find More Posts by wilerbee
Reply With Quote
Sign up now
to remove ads between posts
Old May 30, 2003, 08:19 AM
cv990 is offline
Find More Posts by cv990
Registered User
Joined Feb 2003
24 Posts
The effective direction of rotation of the engine is reversed on a pusher, so the side thrust should be in the opposite direction as usual. You can see this by viewing behind the model - standard rotation is clockwise on a normal model. On the pusher, counter-clockwise as you're now looking at the other end of the engine. So left thrust instead of right.

As for up/down thrust, conventional wisdom usually dictates a thrust line running just above the C.G.'s vertical position to stop excessive climbing when power is applied. By the C.G.'s vertical position I mean the height of the CG above the floor of the Fus/Wing. Low wing planes will have a low vertical C.G. position as there's a lot of weight (the wing) low down - and vice versa for high wing planes. Applying this same theory to pushers - the thrust line (carried forward) should be set to just above the C.G. which will normally mean up thrust (in the aircraft sense).
cv990 is offline Find More Posts by cv990
Reply With Quote

Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Question Down thrust for pushers. Wingnut31 Foamies (Scratchbuilt) 13 Apr 10, 2007 08:24 PM
Discussion Down/Side thrust & pushers Hurra912 Modeling Science 5 May 24, 2006 08:22 AM
Side thrust and up/down thrust for pushers wilerbee Electric Ducted Fan Jet Talk 10 May 20, 2003 06:50 PM
side thrust for the Bandit. oded mazor Electric Sailplanes 3 Oct 12, 2001 05:55 PM
Down-thrust for Lite-stik? bgkast Parkflyers 1 Aug 06, 2001 02:05 PM