My new F15 complete build log (Steve's plan)

Started by foamybuilder, July 23, 2011, 03:44:57 PM

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rohitgupta322

Be Inquisitive

Sumeet

I haven't planned about power setup. Once I complete with the servos for flaperons and the wire extension and motor mount, I will calculate the empty weight and then accordingly decide what to use to power this beauty. By now, I only have decided that the maximum prop diameter I am going to use is 8". As on parkjets.com, they say In pusher jets, the prop. diameter should not be more than 33% of its wing span. It will help to reduce torque role effect.

My F15 has ~27" wingspan. So, can go with 9" at max.

The main reason for choosing 8" is to prevent the prop itself by colliding with ground during takeoffs.

Foamy! please share your flying experience using your power setup once you maiden it. If everything goes right, I will follow your power system.
Are you going to program it to have flaperons on your one?

Thanks.
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roopeshkrishna

"the prop. diameter should not be more than 33% of its wing span. It will help to reduce torque role effect." ....Sumeet..thanks for the know how...have a nice build..
Phoenix.........

foamybuilder

thanks guys.
sumeet,sukrut - yes the elevator assembly is a bit difficult. But I am going with the plans only to save addition of an extra servos as I already have the tailerons on f22. It was too difficult to make sure the two halfs wont touch the surface and have a seamless movement.
I will update the pics today.
roopeshkrishana - adding the landing gears may need either adding rudder or having a movable front wheel which would again require a servo.
The final weight (850 grams)  looks too heavy around 15 to 16oz/sqfeet. Probably painting is more heavier than taping.
Looks like mine is the heaviest in the forum builds!!. Have option for 4S setup. Lets see.

ashJR7202

@ Sumeet,

for jets try to use prop with diameter 6", with higher kv motor this will give u better speed than bigger prop. also with bigger prop there are more chances that prop will hit ground and may eventually damage motor mount!!!

all the best
Hanger: Mini Yak-54| 210 Phantom | SU-47| F-15| EuroFighter|Scrappy|SU 27|Eurofighter|Sukhoi PAK FA
Blade MCX| Blade CP PRO
JR XP7202| DX7

roopeshkrishna

Phoenix.........

foamybuilder

Here are the updates.
Added cf rod.

foamybuilder

finally decided to go with emax2846, mounted the motor.
Somehow Emax 2846 and NTM 35-36 1800kv, both weigh the same (130grams).

foamybuilder

And the best part.. Added elevator. and used props adapters as stoppers.
Used landing gear turning mechanism given by Sanjeev and it worked well.

foamybuilder

Elevator servo in place.

foamybuilder

Wing painted and ready.

foamybuilder

Havent assembled the aileron servos, just placed the wings for a pic

ashJR7202

amazing, things r shappinh up nicly
All the best
Hanger: Mini Yak-54| 210 Phantom | SU-47| F-15| EuroFighter|Scrappy|SU 27|Eurofighter|Sukhoi PAK FA
Blade MCX| Blade CP PRO
JR XP7202| DX7

VC

A lot of effort has gone into building this baby. I am so glad to see that you have taken care to ensure that she is a very good looking bird. All the best and fly safe!
Growing old is mandatory, growing up is optional!

roopeshkrishna

Phoenix.........

sukrut

excellent build!! :)

hope to see it maiden soon! looking forward! do keep us posted! :)

PankajC

lovely build.... how did you do the decals?
Spektrum DX6i | EP Pusher Trainer | EP CUB |

foamybuilder

Thanks vc, i will be very careful while flying this.
@Pankaj, its just a printout on plain sheet and then taped with clear tape.
You can take printout on decal label sheets which I dint have.

PankajC

After having toiled so hard to carefully craft the bird and to get to the finishing stage, one of the toughest tasks is to overcome the anxiety of the maiden. All the best !!!
Spektrum DX6i | EP Pusher Trainer | EP CUB |

arunh

Spektrum DX8 + TM1000 telemetry, DX5e , Phoenix 3.0 Sim, GT-700 Quicksilver

foamybuilder

Checked static thrust with 6x4 prop,3S setup is around 620 grams with Emax 2846 2500kv motor.  ( I expected more though )
Final AUW has come to around 850 grams.
Wanted to have 1:1 thrust on this. May be next time  :(
Will update the max current draw and power loading today.

rohitgupta322

Be Inquisitive

PankajC

what is being used to check the static thrust?
Spektrum DX6i | EP Pusher Trainer | EP CUB |

Sumeet

Hello once again!

Once I thought to create a new build thread of My F15. but as this topic is about the same plane using same plan, why to create a new thread. So, I am posting the photos of my build here.

Dear Mr. Author(foamybuilder), Please forgive me if you wanted this build thread to be unique.   :bow:

Here it goes...

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Sumeet

First picture(26072011025) shows the spar inside the wing to provide a symmetric airfoil.

Electronic part is remaining to be configured. Will post more pics after I paint this beauty.

Thanks.
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