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Author Topic: Building and flying P-25 indoor (the elastic model airplane)  (Read 21453 times)

alle

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Building and flying P-25 indoor (the elastic model airplane)
« on: January 09, 2011, 13:38:19 PM »
Materials:

 several rods, taken from a plate 3 / 32, all measuring 25cm
 (being equal to 2 wings, 2 equal to the elevator and rudder, the preference of the elevator and rudder a little thinner and about 3 or 4 ribs for the wing, the elevator and rudder, like those)
 ca glue (use super bond)
 harmonic steel wire (one that is used to link aircraft)
 seam line (it's thinner)
 market sling (I use because it does not shrink in the heat of the trunk of the car)
 bead 1
 toothpick some
 a piece of balsa 3 / 32 and sanded to helice
 brass tube (at home fishing finds easy)




Tools


 steel blade or razor blade''''
 needle-nose pliers
 ruler


 Fuselage

part of the elastic traction is enhanced



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alle

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Building and flying P-25 indoor (the elastic model airplane)
« Reply #1 on: January 09, 2011, 13:41:11 PM »
Making the propeller shaft bearings



 a piece of steel wire + - 3cm
 a brass tube
 Usually set with ca, then wrap the line tight and more ca


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alle

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Building and flying P-25 indoor (the elastic model airplane)
« Reply #2 on: January 09, 2011, 17:41:48 PM »
Fixing bearing and hook that holds the engine in the fuselage


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alle

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Building and flying P-25 indoor (the elastic model airplane)
« Reply #3 on: January 09, 2011, 17:43:26 PM »
Making wings, elevator and rudders



 Wing 6-8 inches of rope and a wingspan of 25cm, using five straight grained.
 Elevator and rudder at least 2cm shorter the rope, the same scale, also use five straight grained.

 The division of the ribs on the wing, where the center in March 12.50 cm, the rest divided equally.
 The division of the elevator ribs are different because the rudders are together, the center in March, I leave 2 to 3 inches of rudder at each end of the elevator.


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alle

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Building and flying P-25 indoor (the elastic model airplane)
« Reply #4 on: January 09, 2011, 17:46:27 PM »
Screened wing, elevator and rudders.


 Open the bag
 Ca pass on the wing
 Cover the wing with plastic stretched over the finger and settle down to the plastic
 Do the same with the elevator and rudder

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alle

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« Reply #5 on: January 09, 2011, 17:48:22 PM »
Cutting the remains of the wing, the elevator and rudder


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alle

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Building and flying P-25 indoor (the elastic model airplane)
« Reply #6 on: January 09, 2011, 17:50:14 PM »
Making the dihedral of the wings (which is polyhedron) and the rudders.

 I always start by the middle of the wing, I'll even break some fibers warping step ca ai ai and let dry again ca.

 The rudders are at right angles as it is harder to break down some fiber, so sometimes I have to for a few props, this case did.


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alle

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Building and flying P-25 indoor (the elastic model airplane)
« Reply #7 on: January 09, 2011, 17:52:00 PM »
Angle of attack of the wing.

 I leave almost equal use 1 or 2 mm difference in the leading edge of the board to escape, usually do well Fortinho media wing, broke the previous always there.

 (also is leaving the adjustable angle of attack there are several ways, but is for another time)



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alle

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« Reply #8 on: January 09, 2011, 17:53:40 PM »
Propeller Shaft



 Always make the helices fixed.
 I hook shaft, while the bearing, put the bead and helice, drop and roll ca a little line and ca again, that the maximum of attention to helice should form an angle of 90 degrees with the shaft.



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alle

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« Reply #9 on: January 09, 2011, 17:55:35 PM »
Prop

 materials


 piece of balsa 1 / 16 or 3 / 32 and sanded
 toothpick

 Mark the center of the toothpick and stick with the drill or own wire if wire has to have patience.




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alle

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« Reply #10 on: January 09, 2011, 17:57:04 PM »
Toothpick ready to receive the country, use a toothpick to be strong and lightweight, I got tired of breaking helices landing.

 Drawing the tr, trace a straight 6 or 7 cm, do one side.



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alle

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« Reply #11 on: January 09, 2011, 17:59:31 PM »
Now cut out that side done twice exactly in the middle and drawing the other side to be equal.



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alle

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« Reply #12 on: January 09, 2011, 18:00:46 PM »
Ready propeller blade, you just draw on the raft and cut the center's patients should be drawn to the collage.




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alle

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« Reply #13 on: January 09, 2011, 18:04:25 PM »
Now cut and place the cut exactly in half (so the drawn line), to engage the toothpick, it is important that the cuts are equal in both propeller blade
. (In all plants of p-25 I noticed that the size of helice was no more than 15cm, so I try to keep this measure)



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alle

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« Reply #14 on: January 09, 2011, 18:06:31 PM »
What is the angle of attack of the propeller?

 This subject is very complex, has many variants in this model by using motor 3 / 32, let an angle less than the plants I have seen P-25.






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