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jet legend F 15 diet

Old 11-17-2011, 02:38 AM
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Default jet legend F 15 diet



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I done an extensive modification of instaling ailerons and flaps, as all hiden control rods and servos.</p><p class="MsoNormal"><span style=""></span>I equiped it with JetCat P 120, two A123 bateries, Hitec servos and jettronic air valves and sequencer.</p><p class="MsoNormal"><span style=""></span>It also used Futaba gyro on nose wheel.

Here is the video of a maiden.</p>http://www.youtube.com/watch?v=jwUHT...layer_embedded

<p class="MsoNormal"><span style=""></span>Since this was my first jet, not counting some df flying, i was very pleased with the performance. Althought it flew without any trims and seems very neutral, it was evident to me that this was very serious airplane.</p><p class="MsoNormal"><span style=""></span>The take off roll seemed longer than what i saw on videos of sutch planes.</p><p class="MsoNormal">Also, it had to bee flown fast to feel controlable.</p><p class="MsoNormal">Also, as you can see, the landing was a bit fast.</p><p class="MsoNormal">It did slowed down nicely on touch down, but the final was very fast.</p><p class="MsoNormal"><span style=""></span>I used a &frac12; flaps on landing, because, to be onest, my knees vere shaking and i was afraid to deploy it totaly.</p><p class="MsoNormal"><span style=""> </span>I drove quite far to fly on abendoned airport with tarmac runway.</p><p class="MsoNormal"><span style=""></span>First trys of taxi on local grass field make me wonder should sutch plane be flown from grass runways.</p><p class="MsoNormal">The retracts <span style=""></span>also seems flimsy when going through grass.</p><p class="MsoNormal"><span style=""></span>For second flight, i reduced the aileron throws, made some expo on throtle curve and made a careful adjustment of wheel toe and nose wheel position.</p><p class="MsoNormal"><span style=""></span>On second flight, the taxi run on full throtle seems stright as an arow, althought the slow taxis vere veering on one side.</p><p class="MsoNormal"><span style=""></span>Reading a Bob Viloet sugestion for take off for jets, i taxi down the runway, turn in to the wind, aplly brakes, flaps<span style=""> </span>about 1/3, and half up elevator. When the turbine reachs over 60% rev, i deployed the brakes. The taxi was stright but since i was runing slightly cross the runway, when i tried to strighten the plane down the runway, there was apsolutely no reaction to rudder output.</p><p class="MsoNormal"><span style=""></span>After 200ft i hit one bush on one side of runway (of course the only one), with full right rudder holding, but without airplane showing any tendency to react on my input.</p><p class="MsoNormal"><span style=""></span>I supose that the problem was that the F 15 raised its nose soon, so i lost the front wheel steering.</p><p class="MsoNormal"><span style=""></span>The rudders was simply unefective, so the steering was imposible.</p><p class="MsoNormal"><span style=""></span>Now for the damage...</p><p class="MsoNormal"><span style=""></span>As the fuselage is arow like, it protrude through the bush, but the leading edge of wing suffers all the pounding.</p><p class="MsoNormal"><span style=""></span>I ruined almost entire right wing, left wing leading edge, some minor damage to front part of fuse and after the plane roll on its back, there was a slight damage to one of vertical stab tip.</p><p class="MsoNormal"><span style=""></span>The worst damage was on the wings.</p><p class="MsoNormal"><span style=""></span>Hawing spent many heures adjusting and measuring everything on this plane, i must admit that the measuring of final weight of plane was not done.</p><p class="MsoNormal">I measured all components and astimasted weight should been <span style=""></span>11 kg.</p><p class="MsoNormal">But, after the crash, the actual weight <span style=""></span>measurment was 12700 grams.</p><p class="MsoNormal"><span style=""></span>It looks to me that i overshoot the manufacturers weight.</p><p class="MsoNormal"><span style=""></span>It certainly was overweight and that might be the reason for very fast landings and generaly high flight speed. I had the impresion that it was hard to to make a bank turn during landing, because the plane would slip to a side.</p><p class="MsoNormal"><span style=""></span>After building and flying over 100 airplanes in past 35 years, i knew that those vere the signs of heavy and maybe a little nose havy airplane.</p><p class="MsoNormal"><span style=""></span>I spoke with my flying buddys who were ther that day, all of those was not noticeable to the spectators, except for the evident high speed of F 15.</p><p class="MsoNormal"><span style=""></span>Since i had many problems about ordering a new pair of wings, where the shiping was more expensive than the price of wings, i started thinking about making them.</p><p class="MsoNormal"><span style=""></span>That opened the idea of making the diet and general enlitening<span style=""> </span>of airplane.</p><p class="MsoNormal"><span style=""></span>Twin battery pack (470gr) &ndash;gone, all the cable extension holders and shirms (around 250gr) gone, starting gas equipment ( almost 500gr)...gone....but the heaviest part was the vertical stabilizer and rudders.</p><p class="MsoNormal"><span style=""></span>Before making a new wings, i started with my idea on stabs.</p><p class="MsoNormal"><span style=""></span>I made something like this 15 years ago as a student.</p><p class="MsoNormal"><span style=""> </span>This constuction is<span style=""> </span>made of honeycomb construction from 2mm balsa.</p><p class="MsoNormal"><span style=""></span>I mounted the two aluminium airfoils on each side wich vere used as guides during sending the honeycomb.</p><p class="MsoNormal"><span style=""></span>I planked the whole construction with 1.5mm balsa.</p><p class="MsoNormal"><span style=""></span>The conclusion was that this was a very lite and rigid construction. The skin integrity was great because the free area between ribs ( honeycomb elements) was mutch smaller than on classic constructions.</p><p class="MsoNormal"><span style=""></span>When building the styro foam wings, i hate the amount og glue that is needed to atach the skin on core. In this case, even that was mutc better.</p><p class="MsoNormal"><span style=""></span>Now, 15 years latter, with computers an laser cuts, i made this construction</p><p class="MsoNormal"><span style=""></span>mutch faster and more precise.
This is how we started</p>






<p class="MsoNormal">I have my good frien helps me in drawing the entire construction by SolidWorks.</p><p class="MsoNormal"><span style=""></span>The orientation of elements was sutch that as many elements reach from the stab root to tip.</p><p class="MsoNormal"><span style=""></span>Also i carefulu incorporated the trailing edge of stab, wich holds the hinges, so<span style=""> </span>it does not cutt any of those elements.</p><p class="MsoNormal"><span style=""></span>I cutted all the elements, by lassercut, from 2mm balsa and planked it with 1.5 mm balsa.
















</p><p class="MsoNormal"><span style=""></span>The leading edge is made from two layers of balsa. First, the false leading edge , is made from 1.5 mm balsa and it helps during planking, because i simply glued the plank on it.







</p><p class="MsoNormal"><span style=""></span>After planking, i aded one 4mm leading edge.</p><p class="MsoNormal"><span style=""></span>On trailing, i used 10 mm as leading edge of rudder and 5mm on stab trailing edge.</p><p class="MsoNormal"><o></o></p><p class="MsoNormal"><span style=""></span>I instaled the carbon tubes wich is going to hold the aluminium tubes for attaching the stabs to a fuselage.</p><p class="MsoNormal">The squares is 30x30mm.</p><p class="MsoNormal"><span style=""></span>I made some infills for attaching Robart hinges, thre on each rudder.

</p><p class="MsoNormal"><span style=""></span>The thin HS servo is located at the bottom at the stab.

</p><p class="MsoNormal"><span style=""></span>Arround the big opening for servo, i made one frame from 1.5mm ply, so i could distribut the loads evenly.

</p><p class="MsoNormal"><o></o></p><p class="MsoNormal"><span style=""></span>Most fillets is instaled to help distribute the loads from carbon tubes to planks.</p><p class="MsoNormal"><o></o></p><p class="MsoNormal"><span style=""></span>I planked one side with ca, wich is used for all the glying, but has to use white gly on other side.

</p><p class="MsoNormal"><span style=""></span>I also made the tip forms from balsa and ply core.



</p><p class="MsoNormal"><span style=""></span>I used three hinges per rudder and i made a small block dubler for mounting the rudder horn.</p><p class="MsoNormal"><span style=""></span>Also i made small fairing on stab for hiding the hinges from rudder and to help airflow flow over gap.



</p><p class="MsoNormal"><o>
</o></p><p class="MsoNormal"><o>








</o></p><p class="MsoNormal"><span style=""></span>When it was finished and sended i cover it with 25gr glass cloth.







</p><p class="MsoNormal"><span style=""></span>At this time, every stab weighted around 90 grams, with hinges, but without servo. The weight of original stabs, painted, with servo, was little over 400 grams, each.</p><p class="MsoNormal"><o></o></p><p class="MsoNormal"><span style=""></span>The final measurements is still to be made but the weight loss is evident.</p><p class="MsoNormal"><span style=""></span>This will allow me to get rid og plenty equipment i installed in nose, so i hopes it will greatly effect the final weight.</p><p class="MsoNormal"><o></o></p><p class="MsoNormal"><span style=""></span>The tosion stiffnes is very high.</p><p class="MsoNormal">Also when you hold the stab in your hand, you cant ask yourself about how lite and rigid the constuction is.</p><p class="MsoNormal"><o></o></p><p class="MsoNormal"><span style=""></span>At the moment of writing this text, all components are glassed and sended, waiting for details and painting.

</p><p class="MsoNormal"><span style=""></span></p><p class="MsoNormal">Now im building a wings by same method.</p><p class="MsoNormal"><span style=""></span>For the end, let me say that i did made 1.5 degrre convergent (wash out) on stabs tips.</p><p class="MsoNormal"><span style=""></span>That means that the center line of tips airfoils of vertical stabilizers is meeting itselfs at some point in front of the airplane.</p><p class="MsoNormal"><span style=""></span>This is common on multi engine configurations and i hopes that this will help F 15 tracks even better.</p><p class="MsoNormal"><span style=""></span>Any opservation as comparing of other F 15 of that size is greatly appriciated.</p><p class="MsoNormal"><span style=""></span></p>
</meta&gt;</meta&gt;</meta&gt;</meta&gt;
Old 11-17-2011, 10:27 AM
  #2  
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Default RE: jet legend F 15 diet

Impressive construction of the stabs. I've never seen something like that, I can only imagine how light and stiff it is. A+ job, I think you are on the way to a great flying plane here, I'll be watching!
Old 11-17-2011, 11:33 AM
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Default RE: jet legend F 15 diet

impressive work!!! my JL F-15 weights in at 29 lbs and flies great, balance is center of forward wing spar, from watching your video it looks like you were more nose heavy then that. i do not use a gyro and my steering works great both on take off and landing roll. the only issue i've had with mine was the nose wheel hung up on me a couple weekends ago at an event (issue has been fixed), as you can see even in a 15-20 mph 90degree crosswind she was steerable.

http://youtu.be/fxhHLsKXNDc

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