Im flying Tiger trainer 40, i've built and was even flown by my instructor, but...

He said that my plane did lean too foward... (too much weigh on the front part of the plane).. and so i've been kept thinking of what should actually be repositioned.

my plane inner plan:

---- <-- prop
_|_ <-- engine section =P
| A| <-- fuslage
| B|
| C|
| D|
| D|

A: This compartment stores my fuel tank (300cc) and a receiver battry on top wrapped with foam.

B: My receiver (Where all the wires are connected from the servos and battry, HUB)

C: Empty space... only some wires going thru this compartment

D: my servos...

Any idea what hardwares should i shift to any comparments

If gotta a Tiger Train 40, please tell me where did u put each and every hardware.. =D

JingYou,

It looks to me like your battery is too far forward. Try moving it back to the "C" position, or put your reciever in "C" and put the battery in "B". You must check the balance before your maiden flights. Your instuctor should of checked this before taking it up.

I had this plane many many years and as I recall, it flew great. I don't remember where the CG was, but your instruction book should have it. (probably about 3 1/2" to 3 3/4" back from the leading edge)

Let us know if you any more questions.

Gary

As is true with most other models on the market, this trainer has its flaws. Following these suggestions, the major flaws can be corrected during assembly. The firewall installation is weak. This can be corrected with the addition of reinforcement where the firewall joins the fuselage sides and bottom. This can be 3/8" x 3/8" triangular stock or 1" wide fiberglass strips. Either way, epoxy should be used to join the reinforcement.

The entire tank area should be coated liberally with thinned epoxy or polyurethane in case a leak occurs. The epoxy used can be the 5 - minute type thinned with a small amount denatured alcohol to a thin liquid consistency. As an added precaution, a 1/8" diameter hole can be drilled in the bottom of the forward part of the tank compartment right behind the firewall. This will allow the fuel to drain in case a leak occurs.

The tires are far to soft and should be replaced with the hard foam type. Larger tires, 3" diameter minimum, will be required if the trainer is flown off a grass field. Carl Goldberg Lite-Flight tires are recommended.

The black plastic windscreen and back window to not fit well when glued on and the side window decals are not fuel proof. The best thing to do is to mask the window areas and paint with black polyurethane. This will result in a better overall appearance and eliminate future problems.

Assembly of the model involves little more than joining the wings and attaching the tail surfaces. A pocket must be cut in the center ribs for the servo. This should be done before the wings are joined using the aileron servo as a guide for the width and depth of the cut. Cutting the slot after the wing halves are joined is difficult at best.

Holes are drilled through the fuselage for the wing hold-down dowels. The points for drilling the holes are indentions in the plastic windscreen. It will have to be trimmed as if it were going to be installed and used as a template for the location.

The tail surfaces are attached to the fuselage in the slots in the plastic turtledeck. The tail surfaces should be trial fitted to make sure that the vertical stabilizer (fin) sits squarely on the horizontal stabilizer when it is properly installed. The parts can then be removed and joined together with epoxy before installation. Care must be taken to ensure that the vertical stabilizer is perpendicular to the horizontal stabilizer and that the horizontal stabilizer is properly aligned with the wing. If there is enough room under the rear of the turtledeck, it would be a good idea to glue 1/4" x 1/4" triangular stock on both sides of the joint between the vertical stabilizer and the
horizontal stabilizer.

The elevator may touch the bottom of the rudder with the control throws set just above the recommended amount. It is best to trim the sloped section at the bottom of the rudder before the tail group is installed.

The striping on the side of the fuselage is not fuel proof. To protect the looks of the finish, the entire model can be sprayed with a thin coat of clear polyurethane that will seal the edges of the striping and covering.

The model balances easily with the Thunder Tiger GP40 engine if the receiver and battery pack are placed in the compartment behind the tank. If the recommended control throws are used, the trainer will fly well with very little trim required. The rudder throw may need to be increased a little to give it a little more authority on landings.

Howard

I had this airplane and everything balanced out perfectly without adding any extra weight. Are you balancing the airplane with an empty tank? Try moving the battery as far back as possible and see if that helps...

Have a TT40 too. Crashed it on my first flight and rebuild it again. Anyway the TT is known to be tail heavy which was true in my case. I keep the rcv and battery tied together behind the tank. You could easily add some wheel balancing lead to the rear of the plane or if it is very slight offset just use the trim.

Let me know if you have a GP42 engine and it works well. Mine is horrific. see my posts for my troubles with the TT

I am not trying to be rude or anything, but...Find a new instructor!

Now, pick up the instructions. Find out where the airplane should balance and mark that point on the wing. With the airplane fully assembled WITHOUT FUEL pick the airplane up with your fingers on the points you marked. If it leans forward just a little bit it is fine. If it leans back move everything as far forward as possible and add more weight to the firewall if it's needed. If it needs forward so much that it won't stay on your fingers you either have fuel in it or you are using an engine that is too big for the airplane.

If you don't have instructions on the airplane, balance it right on the main spar or the thickest part of the wing or right where the sheeting ends OR 27% of the length from the leading edge to the trailing edge.

I have a TT Trainer to throw around on windy days and I've had 3 different engines on it. Unless you put a .60 on that thing it won't be nose heavy!

Jing, don't be as hard on the instructor as Brian says. Nose heavy is still flyable and your instructor probably knows what he is doing. The instructor got the plane back in one piece and told you how to make it fly better. Theres nothing wrong with that. Once you think you have the balance right, ask an instructor to check it prior to flight. If its tail heavy by even a bit, its bad and makes training very dangerous. Battery packs are heavy and you can probably get the correct balance by moving it to the C position on your diagram as Airgar suggests. At least you get to fly this time of year. Its snowing again here!!