Engine Capability

[Gerard Jordan]

Can anyone say if an Irvine 53 red top engine running the appropriate prop could reasonably, or only just, or not at all, `lift` an 83 inch wingspan Thunder Tiger J3 Cub?
ASAP ( in time for Rougham ) to gerard.2@virgin.net LMA 4001

[Bob Thompson1894]

yes Gerard, they are very powerful engines!

[Gerard Jordan]

Much obliged Bob thank you
Gerard Jordan

[Alan Cantwell 1131]

not sure of your experiance, so apologies if this is granny, suck eggs thing, what experiance have you got? if you are learning, pleas say so, cos the cub will have a few traits that you need to know about

[Gerard Jordan]

Thank you Mr Cantwell for your good intentions, I welcome any help I can get. I have had a 25% J3, but severly bent it and am in the process of perhaps acquiring another somewhat smaller. What specifically are the problems with Cubs that you had in mind for this learner.

[Alan Cantwell 1131]

the engines more than enough, its the wings that are the problem, cubs are all the same, set the ailerons up with differential, make sure the up going aileron moves twice as much as the downgoing one, try not to use them much on take off, keep it level with a rudder input, DONT couple them, use your thumbs, my personal view, is that cubs dont make friendly trainers, owing to them being a stick and rudder machine, the learner has enough to think about, keeping it in the air!!!

[Gerard Jordan]

Thanks very much indeed Alan that`s all very good and useful stuff. Using the rudder in that term is instinctive as from full size flying when you are "sitting in the middle" so to speak Your info on the aileron setting up will be very helpful also. The LMA with its enormous reservoir of expertise, as evidenced here, is a god send when like me one has very little model experience. My previous Cub was set up by the guy who built it for me and he must have incorporated all the points you make as I found it a delight to take off and fly in spite of it`s size. Just a bit fragile ! !
Gerard

[stuart cotgrove]

Had an 82" Cub a few years back that ran very well on an OS52 four stroker so the I53 will be more than enough.

These planes fly on the wing and not the engine of course..

[Gerard Jordan]

Thanks Stuart GJ

[Alan Cantwell 1131]

GLAD TO HELP, the problem with the cub, and indeed anything that has lots of glazing, is the fact they wont stand a tumble, all that missing wood, doesnt help in a training enviroment, so, give it some help, where the uprights meet the cabin, glue pieces of shaped ply across the join,
If you can get it in, but an X brace, corner to corner, across the cabin top, this will reinforce the cabin to some degree, and wont be seen from a casual observation, little bits of re-inforcing 1/16 ply will go a long way to make the model stronger,

[stuart cotgrove]

GLAD TO HELP, the problem with the cub, and indeed anything that has lots of glazing, is the fact they wont stand a tumble, all that missing wood, doesnt help in a training enviroment, so, give it some help, where the uprights meet the cabin, glue pieces of shaped ply across the join,
If you can get it in, but an X brace, corner to corner, across the cabin top, this will reinforce the cabin to some degree, and wont be seen from a casual observation, little bits of re-inforcing 1/16 ply will go a long way to make the model stronger,

and make sure the wing mounts are checked and double checked if if catch a wing on landing.

Saw one last year that turned in to a lawn dart when the wing mounted broke loose on a flight after a landing/ground loop occurred... Amazing, the wing "landed" about half a minute after the fus.

[Alan Cantwell 1131]

your blind stuey wasnt that a polikarpov

[stuart cotgrove]

your blind stuey wasnt that a polikarpov

you talikng about my polly at wellingborough?

[Dave Berry 2911]

your blind stuey wasnt that a polikarpov :evil

you talikng about my polly at wellingborough?

Now that's what I call confusing - do you mean Polly or Polly????????

[Gerard Jordan]

Many thanks Alan, (Now he tells me, he said, ( dustbin bag in hand ).