RE: Designing a new pattern model
 

That's amazing Alex. Your accomplishment is so impressive. Your very talented.

RE: Designing a new pattern model
 

AMEN!!!!!

What a plane!!!!
Tell whatever but Pattern ship doesn't need so meny colours and strips everywhere for being nice... they're outstanding just white, and this plane is even nicer in all white.
Again, congratulation Alex; great job!!!

Guille

RE: Designing a new pattern model
 

Can't say anything alex....Superb !!! [sm=thumbup.gif][sm=thumbup.gif][sm=thumbup.gif]

RE: Designing a new pattern model
 

Thanks everyone for the kind words, i really appreciate it.

Wheelpants would look great indeed but i need to save weight where it's possible. I attached a few shots of the interior and the weight list, so please let me know if you have any ideas for saving weight.

The Scorpion S5525-225kV motor is very powerful, on a fresh set of batteries and using a 19x12 APC propeller i had 3600W on the wattmeter so i had to limit the throttle curve at 92%. I'm still getting 3200W but at least the current dropped to an acceptable value during static tests (~82 A). The ESC is a Castle Creation ICE 80HV and the batteries are Rhino 4900's lightened by removing the shrink wrapping and cutting the wires short.

Edit: so far i have 3 solutions for the weight problem:
1. remove the spinner - easy fix, but spoils the lines of the plane;
2. build a lighter cowl - the one in the pictures is one of the first attempts, i can probably save at least 20g building a new one;
3. buy HV servos and remove the regulator (saves 38 g but it's quite expensive).


fuselage..........................1039
cowl...............................125
canopy.............................117
rudder..............................70
gear+screws........................144
wheels+axles........................50
taiwheel assy.......................20
left wing..........................327
right wing.........................325
left stab...........................96
right stab..........................96
wing+stab tubes.....................80
motor..............................690
ESC.................................98
10s battery pack..................1200
receiver............................25
rx battery..........................55
spinner.............................45
propeller...........................70
rudder servo+carbon horn+screws.....70
elevator servos (2)+screws..........60
aileron servos (2)+screws..........120
control rods........................22
regulator...........................38
servo leads.........................60
wing adjusters+screws...............21



total.............................5063

RE: Designing a new pattern model
 

Alex, this is a prototype and earlier in this thread you mentioned that you did not use the very lightest balsa so all things considered, your finished weight is very respectable. Maybe you can save a few grams next time you layup the composite parts? I believe you said that the plywood used in the frame was 1.5mm regular plywood... does someone (even if it's from overseas) make 1.5mm lite ply? Go test fly it and enjoy the fruits of your labor! Once you get the incidences right and make any decalage changes to minimize mixing, you could certainly offer short kits for sale to help recoup your development costs....
we are entering the winter building season and the marketplace is crying out for a reasonably priced, well-engineered pattern kit!!!

RE: Designing a new pattern model
 

Very nice plane Alex.

You could get it under easily with a different motor such as a Plettenberg. Did you run a single 4 wire lead back to the elevator servos instead of seperate servo leads? That would be good for 10 to 15 grams. A Jaccio regulator is 15 grams instead of 38 (Not sure it's available where you are). You are close. I'm sure with a little tweaking you will get it under.

Joe Dunnaway

RE: Designing a new pattern model
 

In our UAV we changed battery in order to save some weigth too; we had TRU RC 3P 4S (11.1@16A) weigthing 1216g and now we went to a custom pack: 3P 3S ([email protected]) which weights 1068g.
Maybe you can give a similar approach to your system; I can give you more detail on monday if you have interest...

RE: Designing a new pattern model
 

Alex:
I will save you 26g on that regulator for free. Send me a PM with your mailing address and I will send you one Tech-Aero PLR5-E programmable regulator to replace that 38g regulator that you now have.

RE: Designing a new pattern model
 

Thanks everyone for the tips, it's really helpful.

I couldn't find 1.5mm liteply anywhere. I can get 3mm liteply here, but weight is the same as 1.5mm regular ply. A kit version is in the works, just need more time. Should be at least 150g lighter, so weight shouldn't be a problem.

A lighter motor or lighter batteries would solve my weight problem, but i have to be careful before changing them because CG will be pushed further back. CG is currently at ~30% MAC, so i have to think about that too. It's also quite expensive to make such changes.

Thanks Ed, that's a very generous offer but following the advice i got here on PM and from local pattern pilots, i already ordered a Powerbox Digiswitch today.

RE: Designing a new pattern model
 

Alex, I don't know how particular they are in Rumania, but here weighing planes is not something done at our national contests. Although there is a 5kg(+1%, so 5050grams) rule, it has sort of been decided by the flyers we don't really push for this. So I would just go and fly & enjoy!

Volkert

RE: Designing a new pattern model
 

Well, our national contest is very strict about the rules. Weight and sound checks, dimensions, battery voltage, everything is done by the book.

RE: Designing a new pattern model
 

I finally took the model out to the flying field for the maiden flight yesterday. The conditions were not ideal (overcast, strong crosswind) but even considering the limited practice i had this year (only 6 flights with a foamie), i just couldn't wait any longer.

Take off was short and all the trim needed was 1 click of right aileron and 1 click of up elevator. First flight was a little shy, but by the third flight i was confident enough to try a knife edge loop. It went very well, probably just needed to add throttle sooner in the second half. With more practice it will be perfect.
Knife edge pulls a little to the belly, but i completely expected that having the CG so far back. Downlines are very slow, and even if the entry speed is higher the model actually decelerates on its way down. I forgot to switch to rudder high rates for most of the stall turns, so i can't comment on that at the moment.

I attached a few pictures from the flying field and 2 videos. First one shows the maiden flight, so it's a little boring and for the second i tried to gather more aerobatics from different videos. Don't expect too much from these videos, i was just flying around trying to get used to the plane.

[youtube]http://www.youtube.com/watch?v=Z-CuLtY3Xm0[/youtube]

[youtube]http://www.youtube.com/watch?v=jJgsoK6DmMY[/youtube]

RE: Designing a new pattern model
 

Hello Alex

Great job.
I thought the name was Hypnose !
regards

RE: Designing a new pattern model
 

http://www.rcuniverse.com/forum/js/f...sn/thumbup.gifOut-freakin'-standing!

RE: Designing a new pattern model
 

Looks awesome, very good speed.

Congratulations!

Alejandro

RE: Designing a new pattern model
 

Thanks everyone, i'm really glad you like it.

Hi Claude, i didn't really use the name "Hypnose" excepting the paintscheme renders for the composite version. Thought about a name for a while, and finally decided to call it "Radiance".

RE: Designing a new pattern model
 

Who cares the name?!?!?! IT's beutiful a flyies like a dream!!!! (just kidding...)

RE: Designing a new pattern model
 

Alex, how has this updated (lighter weight) design progressing?

RE: Designing a new pattern model
 

Hi Mark,

The V2 prototype was built by a friend of mine and is almost ready to fly. Fuselage is already glassed and painted, only wings and stabs need to be film covered.
Fuselage is almost identical on the outside, but the internal structure is completely different. Wings and stabs are swept, foam and balsa construction, but the plan is to also design and build balsa structure wings. Will post details here as soon as possible.

RE: Designing a new pattern model
 

Very nicely done Alex. Beautiful plane and it seems to me a very nice flying..

Best regards from Serbia,
Nikola
;)

RE: Designing a new pattern model
 

<div id="gt-res-content" class="almost_half_cell" style="display: block"><div dir="ltr" style="zoom: 1"><div id="tts_button" class=" "></div><span id="result_box" class="long_text"><span title="Ol&aacute; Alex Voicu, eu sou do Brasil, Desculpe meu ingl&ecirc;s pois n&atilde;o conhe&ccedil;o muito bem seu indioma, fiquei adimirado com seu trabalho, eu tamb&eacute;m gosto muito do solidworks para desenvolver meus modelos, tenho um projeto completo de um extra 330 para motor glow 1.60," onmouseout="this.style.backgroundColor='#fff'" onmouseover="this.style.backgroundColor='#ebeff9'" style="background-color: #fff">Hello Alex Voicu, I'm from Brazil, sorry my English because I do not know her very well indioms, I admired their work, I also really like to develop my solidworks models, have a complete design for an extra glow plug 330 to 1.60, </span><span title="gostaria de saber se tem interesse de compartilhar experi&ecirc;ncias." onmouseout="this.style.backgroundColor='#fff'" onmouseover="this.style.backgroundColor='#ebeff9'" style="background-color: #fff">I wonder if you are interested to share experiences.
</span><span title="Gostaria muito de fazer uma troca com voc&ecirc; e quero saber se vc disponibilisaria seu modelo completo, sei que tem interesse comercial nele mas estou a milhares de kil&ocirc;metros de voc&ecirc; e isso n&atilde;o te atrapalharia, eu tamb&eacute;m posso disponibilisar meu modelo completo se voc&ecirc; quiser." onmouseout="this.style.backgroundColor='#fff'" onmouseover="this.style.backgroundColor='#ebeff9'" style="background-color: #fff">I would love to do a swap with you and if you want to know your complete model disponibilisaria, I know that has a commercial interest in it but I am thousands of miles of you and it does not disturb you, I can complete my model disponibilisar if you want. </span><span title="Desde j&aacute; eu agrade&ccedil;o muito, e aguardo respostas." onmouseout="this.style.backgroundColor='#fff'" onmouseover="this.style.backgroundColor='#ebeff9'" style="background-color: #fff">Since already I thank you very much, and I await answers.
</span></span></div></div><div id="gt-res-tools" class="g-section"><div id="gt-res-listen" class="gt-icon-c" role="button" tabindex="0" closure_uid_haek7="7" style="display: none"></div><div id="gt-res-dict" style="display: none">http://img33.imageshack.us/img33/1889/sdgb.jpg
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http://img504.imageshack.us/img504/4825/121yr.jpg

RE: Designing a new pattern model
 

Hi Paulo,
Please check your PM.

RE: Designing a new pattern model
 

Alex, if you ever want to sell it as a plan, count me in for a copy.

RE: Designing a new pattern model
 

Alex, I was so impressed with your work, I posted your thread over at my control line stunt Forum. They are pretty strict about keeping it control line stunt, but the administrator allowed this one to roll. Brother, this is what I am talking about!! As a modeler who uses the same tools you do, this is the type of inspiration and direction I like, to show me just how I need to conduct my business.

Bravo.

RE: Designing a new pattern model
 

Thank you for the kind words.
Some high resolution pictures were uploaded on a friend's server but it went offline and unfortunately the pictures were lost. I'll try to edit my posts and attach the images here on RCU.

RE: Designing a new pattern model
 

Hello Alex

I think this is the wooden Radiance !
Is it your own plane and what is version 2 ?
Nice to know you are going to sell kit.
Claude

RE: Designing a new pattern model
 

Hi Claude,

Yes, it's a revised version, with balsa structure swept wings and stabs and reworked fuselage structure. 2 more prototypes were built and flown by my friend Tommie from South Africa and we're now preparing the final version (V4) that will be released soon as a short kit. Will start a new build thread when everything is ready.

Alex

RE: Designing a new pattern model
 

Hello Alex

Thank for your answer.
Very good choice to make wings and stab in balsa structure.
When you will be ready, if you agree I put a thread of your plane on our French Forum F3A
http://www.f3a.fr/portal.php?sid=0de...42796b961ad947
Claude

RE: Designing a new pattern model
 

Sure, no problem. I am familiar with the french forums and read them every day.

RE: Designing a new pattern model
 

So when is the ARF version coming out ?

RE: Designing a new pattern model
 

At the moment we're working on a short kit that should be ready at the end of september. An ARF takes a lot of time to build and would cost a lot more.

RE: Designing a new pattern model
 

For the subscribers of this thread: the Radiance kits are finally ready.
[link]http://www.rcuniverse.com/forum/m_10970855/tm.htm[/link]