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All Forums >> RC Airplanes >> RC Warbirds and Warplanes >> TF spitfire.
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TF spitfire. - 6/7/2002 3:26:50 AM   
rlink


 

Posts: 9
Joined: 2/19/2002
From: atl ga
Status: offline 		gettting ready to build a TF spitfire would like to know IF any body has build or flew this plane. also would a saito 100 4c be enough engine for this plane.
       Post #: 1

TF spitfire. - 6/7/2002 5:37:26 AM   
Wayne22



Posts: 4310
Joined: 4/10/2002
From: Edmonton, AB, CANADA
Status: offline 		There are several links about the TF Spit around. I'm almost afraid to answer anymore for fear of repeating myself over and over...

The Saito 100 would be lots of power, but you will probably need to add extra weight up front anyways..I chose a Surpass 91 for this reason.

If you choose to build the Spitfire, build lots of lightness into the tail......

_____________________________

All I ask is for a chance to prove that money can't make me happy......

(in reply to rlink)
       Post #: 2

? - 6/12/2002 12:47:08 AM   
JGrc



Posts: 690
Joined: 2/24/2002
From: Pembroke Pines, FL, USA
Status: offline 		NONI, how do you build lightness??
JG

(in reply to rlink)
       Post #: 3

TF spitfire. - 6/12/2002 7:53:58 AM   
LDaba



Posts: 178
Joined: 2/8/2002
From: Queens, NY, USA
Status: offline 		Whenever I have a design that will have a long tail moment and/or a short nose moment I know nose weight will be required to make it balance. To minimize the amount, I take special care to keep the tail as light as possible without compromising structural integrity.
I accomplish this by building a new tail unit. I hand select the lightest wood, with the strength for the task.(experience comes into play here). I then laminate the outline of the stabilizer and elevator and the fin & rudder. I use strips of 1/16 balsa (cut to slightly oversize to the final width ) soaked in water and bent around a form and glued with aliphatic resin. I use between 4 & 6 strips, depending on the size.When dry, I add a framework of ribs to strengthen the structure. I pin the joints, using round toothpick sections, white glued into the joint. This all makes for a very light AND strong structure.
This might save 2-3 ounces. That's alot of work to save 2-3 ounces! Well, it's not just 2-3 ounces. Every ounce in the tail requires about 3-4 ounces in the nose to balance it. That 2-3 ounce weight saving in the tail results in an overall weight saving of around a conservative 11 ounces.
You can also save weight by choosing a lighter tail wheel. Some of those tail wheels could be used as anchors. You could also use a pull pull cable for elevator and rudder, saving the weight of pushrods. Lightening holes could be added to the fuselage. Be careful here, so as not to compromise structural integrity. Again, every ounce saved in the tail results in an over all weight savings of 4 ounces. It IS worth the effort.
The other thing to remember is to position the equipment to aid in balancing the aircraft. If you must add weight, add useful weight. A larger battery pack would be a good thing here.
Well, that's it on that. Happy landings, Tony

_____________________________

Keep 'em Flying
Anthony Puleo, AMA11973

(in reply to rlink)
       Post #: 4

TF spitfire. - 6/12/2002 9:22:27 AM   
Weldmek


 

Posts: 4
Joined: 4/20/2002
From: NC
Status: offline 		Rlink, I'm about 2/3 complete on my TF Spit. I elected to put in a Supertigre 90 for the speed. With Robart retracts and flaps I figured it might need it. I did find I had to cock the cowling quite a bit to compensate for the engine angle

(in reply to rlink)
       Post #: 5

thanks - 6/12/2002 11:26:33 AM   
rlink


 

Posts: 9
Joined: 2/19/2002
From: atl ga
Status: offline 		thanks guys for the advice

(in reply to rlink)
       Post #: 6

TF spitfire. - 6/13/2002 9:17:21 AM   
Wayne22



Posts: 4310
Joined: 4/10/2002
From: Edmonton, AB, CANADA
Status: offline
quote:


NONI, how do you build lightness??
JG


Sorry about that - it is a trite RC way of saying build light...

The Spitfire stab is waaaay over built. That slab of wood in the center can have lightening holes applied with minimum effect on strength - care and experience required. Look at the rudder construction as an example of what can be done.....

Use light glue - ca or alaphalic rather than expoxy

Sand, sand, sand.......

_____________________________

All I ask is for a chance to prove that money can't make me happy......

(in reply to rlink)
       Post #: 7

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