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Free flight models

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andrew wallace:
I'm totally new to flying free flight models although I've been building and flying rc models for donkeys years
I've built two Vic Smeed's Tomboy's and one is being powered by a Mills .75 and the other by a Paw 1cc
My big question is does free flight models have and elevator
I've used thin aluminium as a hinge for the rudder do I do the same for the elevator
Thanks
Andrew  :)

johnfireball:
Hi Andrew, The elevator for free flight is normally built as one piece with tailplane, not hinged and then packed front or back with thin shim to achieve desired flight charasteristics. If its glued in place small plastic trim tabs can be taped to the rear and bent slightly up or down to suit. If its a proper free flight plan or kit the incidences should be setup correctly and  most pitch problems can be sorted by moving the c/g slightly. The same trimtab method is used on the wing if a tendancy to drop a wing is noticed. I recommend have a look at Mike's Flying Scale model pages. Plenty of helpful advice there although rubber powered models the same is true for ic.

John.

johnfireball:
http://www.ffscale.co.uk/page4.htm

This is the page you want. See trimming aids.      Have Fun.

EI1638:
It can also depend on what you mean by hinged. Many high (and not so high) performance FF models are fitted with a 'dethermaliser' (aka DT) in its simplest form a pop up elevator.

Hippocket aeronautics is another useful resource for mostly FF related advice and motivation (or de-motivation when you see what others are building/flying e.g. rubber powered shackelton, Lockheed constellation, both with 4 rubber motors...)

http://www.hippocketaeronautics.com/hpa_forum/index.php

I have often thought that scaling up some of the jetex plans referenced from ffscale.co.uk page that John mentioned above would make a good basis for small PSS models. I've not had enough time to test that hypothesis out though

andrew wallace:
Thanks guys that was brilliant  :)

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