ORIGINAL: ser00
Hi all,
I have wanted to build a Balsa USA Enforcer for some time now. I have seen the enforcers that have been converted to ducted and turbines. Mods on these include extending the nose by 6 inches and moving the CG 1 to 1.5 inches forward. I have also seen some of them with canards. I really like the look of the Enforcer with the longer nose and canards. i would like to do this to my Enforcer build but I do not plan on using a ducted fan or turbine, but an OS 75ax with a pusher prop. If I were to use the 75ax and extended the nose 6 inches and add canards, do I need to still move the CG 1 to 1.5 inches forward? I do not know if the CG is moved forward because of the weight of the ducted fan in the back or if it is do to aerodynamic forces and increased surface area (more lifting body) due to the six additional inches of fuselage and canards? I would greatly appreciate any suggestions,comments, tips or guidance on this.
Happy flying and soft landings!
Going that far forward may be a mistake! It may not flare properly and land very hot.
I once had the "Quickie" arf. The factory CG mark was over 3" to far forward and not enough throw, maxed out on the elevators.
It dropped like a stone with the power off and would not flare, very hard landing!
I added canrads to a Kangaroo Jet with
NO change in CG. And it flew great. Landings were easy and no hop!
The canards came from a 1/9 Rafalle not a lot of area but very effictive with +/- 20mm throw on its TE slave to the high rate elevator.
Then I added canards to my friends Rookie Jet from Comp-ARF after he flew my Roo and like the way it flew.
Slight change in CG, 1/4" forward.
Note the Comp-ARF Rookie II has a longer fuse canards AND uses same CG as the stock Rookie and Kangaroo.
I know since I had a Rookie II after my Roo with canards was retired.
bob