moparmyway

Congrats Murdo !!

Running the New Part 9 is a big task, one in which I am 100% sure that you will handle very well.
I hope to see some very interesting pictures from all sorts of builds and creations.
Hopefully you will be one of the Dudes who chases down and mashes the 185 mph speed record.
I leave this honor in your very capable hands, and I will allways be around to keep an eye on things and help out (like you would need it ?!)

I have watched you grow in your speed quest, and watched your builds grow in strength and speed, I am going to enjoy seeing what you can make happen in this thread and in your future builds.
Good Luck Lord Murdo !!!!!

murdnunoc

Hi, Everyone!

It’s that time again for a new Stryker thread! Every year or 100 pages or so a new thread is started to keep things fresh and provide a new thread host to share the load and privilege of moderating the Dark Side.

Moparmyway has done an amazing job moderating the Part 8 Dark Side thread. Countless people, including myself, have been helped in their pursuit of stretching their Stryker’s performance to the limits and beyond. His tireless testing of airframe improvement and power system selection have led to the fastest Strykers in the world.

History of the Dark Side:
[link=http://www.rcuniverse.com/forum/m_2166480/mpage_1/key_stryker/tm.htm]Part 1[/link] - 9/12/2004 to 5/6/2005 - 2281 posts
[link=http://www.rcuniverse.com/forum/m_2947262/mpage_1/key_stryker%2Cpast/tm.htm]Part 2[/link] - 5/6/2005 to 7/22/2005 - 1860 posts
[link=http://www.rcuniverse.com/forum/m_3191424/tm.htm]Part 3[/link] - 7/23/2005 to 1/6/2006 - 2189 posts
[link=http://www.rcuniverse.com/forum/m_3738912/mpage_1/key_/tm.htm]Part 4[/link] – 1/6/2006 to 11/22/2006 – 2597 posts
[link=http://www.rcuniverse.com/forum/m_5024519/tm.htm]Part 5[/link] – 11/21/2006 to 7/4/2007 – 2511 posts
[link=http://www.rcuniverse.com/forum/m_6069877/mpage_1/key_/tm.htm]Part 6[/link] - 7/4/2007 to 8/24/2008 - 2590 posts
[link=http://www.rcuniverse.com/forum/m_7464076/mpage_1/key_/tm.htm]Part 7[/link] - 5/6/2008 to 6/20/2009 - 2856 posts
[link=http://www.rcuniverse.com/forum/m_8867370/mpage_1/key_/tm.htm]Part 8[/link] - 6/20/2009 to 9/25/2010 - 1943 posts

In this Part 9 Dark Side thread, we will continue the pursuit of making the Stryker run faster, climb higher, and fly better. If you have a desire to get the most out of your current airframe and power system, this is the place to do it! A simple $3 propeller change can turn your current setup into a completely different flying machine, so ask away!

This is also the place to come for new equipment selection. Got your batteries and ESC sorted out, but need help matching up your next motor? The folks here can help. Planning a new hyper build with all new equipment? We can have some real fun with that!!!

Everyone here loves to help, and to be helped. Really we just love talking about Strykers!

I also have a desire to pursue another part of the Dark Side of the Stryker:

HOW CRAZY CAN YOU MAKE IT?!?! [sm=lol.gif][sm=idea.gif]

I’ve seen a guy make a Star Wars X-Wing fighter from his Stryker.
How about Stryker biplanes?
Twin Motor Strykers?
Night flyers?
EDF Strykers?
Slope soaring Strykers?

Throw your ideas out there!

Gryphon

Congradulations Lord murdnunoc,


When Moparmyway told me about his decision to elect you to start part 9, I could not be any happier.


Not only you are more than qualified; your posts, replies have shown great insight and they have impressed me big time for some time.



As elders (past thread starters), we will always be around to support you and the thread.




Later,

Gryphon

chippedprop

Lord murdnunoc

Congrats. Just remember you have help if you need it. it's always a little scary at first...it was for me any way.

Mopar.

You have done a GREAT job with the thread........ fair and balanced to steal a phrase. Take a rest get caught up on stuff

Time for part 9 are you serious..........I remember when...........LOL


Ok!

LET'S GO !!!!!!!!!!!

Chippedprop Lord of the past LOL

chippedprop

Oh

I will be making a how to cover your Stryker video(s) ASAP. I don't think I can get it all in one part...... 10 minutes

murdnunoc

I'll start out the Craziness with my latest build. I've been chasing higher and higher speeds over the past couple of years, but miss the days of tossing my Stryker up in the air and hot-dogging around with it. So this build will be a light-midweight flyer.

It'll also be a twin

With differential throttles for rudder control.

The airframe and power system will be kept light for fun flying. Hoping for 2 lbs. plus or minus a few ounces.

Many of the build techniques are suited for any plane, from light sport flyers to heavy speedsters, so I'll try and point those out.

When we start modifying our Strykers, something inevitably gets cut off. Since my plane won't have vertical fins in the stock locations, I cut off the supports that will get in the way of the motors. A hack saw laid on the wing surface works well to get a straight cut when the parts you don't want cut are protected with a layer of tape.

I'm installing balsa trailing edges for more control surface security. Heavier builds should get hardwood such as basswood or spruce. I'm using a new trick on this one. Triangle stock for the TE keeps me from having to cut the bevel in the elevon.

I'm adding some carbon tube reinforcement since this thing will be more powerful than stock.
Replace stock fiberglass tubes with 5/32" carbon tube
5/32" carbon tube main spar, and a second half spar in the center
6mm carbon tube nose-to-tail
Stock fiberglass rods cut to 10" and inserted in the nose area for support against the "Gonzo Effect"

I cut the channels for my carbon using a 40W pencil soldering iron. It burns away the foam and leaves a sealed cut surface. Use good judgment on fume management and cut with good ventilation!
A cut nail of the same size as the tubing works well for small tube, and a cap screw cuts a nice channel for larger stuff. Set the depth of the screw so that it can run along a straightedge and be just a hair deeper than the tubing.

The carbon is now glued in place with LOW TEMP hot glue. Run a bead inside the channel and press the carbon into it. Then run another bead on top of the carbon and immediately wipe it with the edge of a gift card or scraper to fill in the remainder of the channel.

CWHFSR

Where are you going to put the verticle wings? On the ends?

I want to see an xwing stryker!

murdnunoc

It'll either be a single fin right in the center of the plane or a pair on the wingtips. I think the tip fins will be the ticket, as they can be smaller and still have authority, since they are farther behind the CG than a fin mounted near the motor mount on a single engine Stryker.

My original goal on this thing was to run with NO fins, and have the yaw axis stabilized with the differential thrust of the motors slaved to a gyro. I have the electrical layout and mixing figured out for it, but hit a huge engineering wall when I considered what would happen when the power is off, such as during landing. No rudder control!
So I'll run fins now unless I can figure out a way to have rudder control when gliding.

murdnunoc

Thank you for your support, Lords Moparmyway, Gryphon, and Chippedprop!
The value of your participation will be beyond measure!

Arcteryxxx

Congrats Murdo!!!! Looking forward to following and participating as the dark clouds are closing in!!!!

murdnunoc

Lite Twin Build:

Fuselage support carbon is being installed. This support is, in my opinion, critical to all Stryker builds. It prevents the "banana" shape that an unreinforced fuselage develops over time. This rod, when installed flush with the bottom curve of the fuselage, will also bend the nose down slightly into an better high speed shape. Don't be afraid to use some force when installing this rod, as you WANT the body to bend down to meet the straight carbon.

Rimripper

So I made some changes to my Stryker,this set-up uses a CC 100 ice Het 2w 25 3s 3400mah and turns a 7x5 apce.What Ive added was a 30mm carbon arrow from the nose to the back,I didnt run it right to the tail on thisI stopped about 3 inches from the tail.I had also installed some balsa elevrons a while back but they hung down under the wing which caused drag for me so I had sanded them down to loose any drag that I had before.The Stryker looks rough but she flies so much better now,Im in the makeing of a new build in a few weeks as this one will stay rough looking and be my weekend flier.The girl in the pic is my number 1 supporter!

Rimripper

All Ineed is one of Gary's mount's and a mega for my new build.

murdnunoc

Rim,
Those carbon arrow shafts are a great source of building material. I have six of them in my next high speed build I'm working on. They come out cheaper than hobby shop carbon, and are much stiffer than .210" tube. Stronger, too, for about the same weight.

Your elevons look great. Your bird now seems well set up for the power you have with the HET.

You have a particular Mega in mind for the next build??

Gryphon

Rimripper,

Power comes from battery and if you want lots of power, then you will be carrying more battery weight.

Very quickly you can reach your ESC's limit on 3S if after big power.....so I hope you are open to increasing cell count besides/alongside more battery weight.


Watts = AMPs X Volts

for certain amount of Watts you can go after a bunch of AMPs or Volts....or some of each.

High AMPs X low Volts = Low AMPs X High Volts = medium level of each.


Lets assume 3S is low Volts.


*** To use the ESC you already have you can AIM to go after 4S-8S ....ideally 5S+
For max power from 28mm motor using your ESC, 6S-8S packs will weigh about the same (and close in price) because the 8S will need fewer Amps and its cells will be smaller and lighter. Issue is what can fit in a Stryker.

If you want to run 7S, or 8S, I will send you (2) low KV MEGA 16/40 motors to try out in honor of this great thread. Each motor has had a flight by Murdo besides 2 bench tests each.


First tell us how fast you want to fly, then we can help you with prop and Watts.....then you can comment on number of cells and charger max cell count limits and then we can point to a good match


OR if you are trying to max out your battery on hand, then tell us that too......
What was your initial plan?
What are you thinking about now?

Gryphon

murdnunoc

Gryphon,
You've just managed to completely and concisely outline power system selection.
Great to have that on the first page of this thread. Thanks for posting it!!!
These principles with come up again and again in this thread, but getting it out here right away will help a bunch of people.

I'll venture out and say that the Castle ICE 100A ESC is one of the best things to happen to the Stryker. It can handle up to 4000W when run to its 8S capacity, which is enough to max out just about anyone's thirst for speed. Going high volts allows us to get the most out of speed controller size and cost, and we have the flexibility to do just about anything we want with a single ESC that is super bulletproof and very pocketbook-friendly.

murdnunoc

Rimripper,
Let's hope you have a sweet airframe in the works that's deserving of one of those two motors!

If you have a couple of 4S packs in the 2200-3000mah range that are of the same type and condition, you can connect them in series and get an 8S setup that will be great for driving one of them.

Rimripper

Hey thanks guys,I have been thinking the 16/40's for a purchase they are high dollar motors but I want quality.My used Het 2w 25 is ready for the junk pile I think,it had some prop whobble when I got it and so far Ive had to re-solder the motor leads.Im guessing that that the whobble creates more heat on the motor.I might get a clone motor for the current frame and try to get some better speeds out of it before I"rush"into a build before the snow flies.For lipo's I have a 4s 2200 40c,3s 3400 50c,3s 2200 40c and 2s 2200 30c.What could I try with my current set-up for a faster prop,I am useing the 7x5 right now which isnt drawing to hard right now,any suggestions?
Thanks Greg.
I will post some data today from the 3s 3400 het 2w 25 and 7x5 apce.

murdnunoc

Rim,
You're running the APC 7x5E, right? The E is very significant when choosing a comparable prop, as the Sport and "E" props draw very different power levels.

For a higher speed prop on the same batteries than the 7x5E, your could run a 7x7 Sport and if your system is still happy, then run the 7x8 Sport prop. It will give a higher pitch speed and lower thrust than the 7x5E, but thrust should still be OK for launch and overcoming airframe drag at speed.

Rimripper

Thank you I will try to get my hands on these props with in a few days.Gonna head out now to do a few passes to get some data from the apc 7x5e and I will post it up.

Rimripper

Ok here is some data from the 34003s 40c and 7x5 apc e,these passes were going into a 10k wind.Jeezzzzz its telling me I cant load that pic!!!!And I erased the data!!!!IIm going to try the 6x4 combat prop on a 4s 2200 40c batt. now.I made an mount for the motor last night to accept 3 screws,I epoxied a peice of 1/16 balsa onto the back of a stock mount,it held up nicely as usually one run would bust a stock mount.Ok got in on here had to take a pic of it.

Rimripper

Ok here is some of the 4s 2200 40c with a 6.3x4 combat prop.And that will be the end of my testing on this Het!the motor wire's have burnt of it thats why it shows a prop strike,I never ran this motor hard enough to initalize these problems,Im kinda P.O as Ithink the previos owner ran it harder than stated because these problems started soon after I recieved it.I NEED a MOTOR!!!!Could some one post a link to efuxx web site?

moparmyway

Sure
http://effluxrc.com/MEGAmotor_c8.htm

Rimripper

Can anything be said about the data sheets I posted?

Rimripper

Well Ive looked at some of the megas,boy they are pricey!I am wondering I want to order something that I can run on 3s and then move up to 6s in the future,but wanting something that will give me greater speeds as I go up in cell size,Could someone give me pros and cons and anyother info they have on these mega's.

16/25/2 combat.Will I be able to grow with this in cell size from the 3s and up?and will it have good speed runs?
16/30/2 would this be a greater set-up that is capable of bigger cells as I go?
and then the big dog of them all 16/40/1.5s combat?
Im not to knowlegable with the electric's so any help in making a choice would be nice,like I said I would like something that I can run on 3s and up to 6s to get high speeds and change props around for vert and stunting around.The 145 for the big motors is steep thats why I am aking about the smaller choices also.Sorry for the newb. questions its just if Im going to order one Id like to know some input before I drop big dollars.
Thanks Guys,Greg.