wo23dodge

wells,seems as if DR KIWI is not impressed with me
I posted my combo over at rcgroups and here is his reply

Come on! That motor is 35A max and you are running a 7x6 on 4s!!!!!!

The MegamotorsUSA site suggests that on 4s a 4.5x4.1 prop pulls 35A
Motocalc agrees:
Motor: Mega ACn 16-25-2; 2684rpm/V; 3.32A no-load; 0.008 Ohms.
Battery: Thunder Power TP2100 (ProLite) (15C); 4 series x 2 parallel cells; 2100mAh @ 3.7V; 0.018 Ohms/cell.
Speed Control: Castle Creations Phoenix 60; 0.0012 Ohms; High rate.
Drive System: 4.5x4.1 (Pconst=1.47; Tconst=1) direct drive.
Airframe: Anything you want.
Motor Amps = 34.3
Motor Volts = 13.5
Input (W) = 464.2
Prop RPM = 35424
Thrust (oz) = 31.6
PSpd (mph) = 137.5



What on earth are you subjecting that motor to on 4s with a 7x6 prop? Motocalc suggests 100A+.

Motor: Mega ACn 16-25-2; 2684rpm/V; 3.32A no-load; 0.008 Ohms.
Battery: Thunder Power TP2100 (ProLite) (15C); 4 series x 2 parallel cells; 2100mAh @ 3.7V; 0.018 Ohms/cell.
Speed Control: Castle Creations Phoenix 60; 0.0012 Ohms; High rate.
Drive System: 7x6 (Pconst=1.16; Tconst=1) direct drive.
Airframe: Anything you want.
Motor Amps = 106.4
Motor Volts = 10.8
Input (W) = 1153.9
Prop RPM = 24844
Thrust (oz) = 71.1
PSpd (mph) = 141.2




I did really like the 7x3 prop,maybe I will fly with it.

Gryphon

wo23dodge,

Dr. KIWI is 200% right. You can't just go out and put on any prop on that thing.

The 7X6 gives you 80A 800-850W with an Extreme series battery as I remember.
on 4S extreme 6X6 Graupner CAM and high advance 92A 1320W
4S Extreme 5.5X5.5 was 80ish A 1150W. Same 5.5X5.5 prop on 3S was 550W, so the power doubled.

If you had enough battery it tried to pull way past 100A on 4S, because on 3S and 7X8 it pulls 102A.

You are lucky you didn't fry your ESC, what battery are you running for 4S? Do you have Universal BEC. I sent you a PM last night. I just didn't know the motor you were using and was waiting to hear back, now I know.

4S climbing on 5.5X5.5 was nowhere near as good as climbing on 3S and 7X6.
3S 7X6 rocks hard and is great for day to day flying.

What kind of batteries do you use?
Consider 3800-3S 22C at minimum, but 4500 or 5000 is better to fly longer and be over spec. 148mm long versus 160mm for the last two.
They do fit and balance good enough.

With wooden elevon, you'll need to have the 3800 battery right behind the nose.

Sorry my pics are not up, but will try another relative’s computer tonight. Not being back home sucks and I feel my hands are tied up.

Gryphon

wo23dodge

I never got the PM and I am headed out the door right now to go flying,I'll get back to you later on.

Oh yeah,I never went over 3/4 throttle on the 4s evo 20's I have,the airframe couldn't take it

XxOoCoBrAoOxX

Hey guys just got done flying with my 7x6 prop with the 16/25/2 setup. It had way more climb then the 6x4 and way more speed. I will be ordering a new prop for some more speed. (Note: I am still using the parkzone Rx Tx) Im still waiting for my Dx7

tam popo

Maxamus, Hiya! Sorry to keep hitting on you but you know the Uk supply companies. Trying to find supplier for Mega 6/25/3 or 4 but none listed, any ideas? Alternatives? Getting 2 new shells for project and looked at the tips you sent, all makes perfect sense. Three f27's to add to collection by Juy - the Good, the BAD and the pure Ugly!
______________________________________
And on the 7th day He created the F27b - the rest of the week was for flying it! [8D]

Gryphon

XxOoCoBrAoOxX,
I'm glad your LHS had the APC sport 7X6 when you went in, didn't I tell you it'll be awesome on 3S? Glad you are handling the power all right.
Since you don't have a wattmeter, I can tell you that you can put on a APC Pylon 6.5X6.5 without even worrying. The prop speed (not plane speed) is way more; I think it was low 120's or 130's(133MPH???)(ask me in 4 days) compared to 115MPH prop speed of 7X6 using a 3800-3S and you have a 4500-3S. Don't think that it will fly at the prop speed because it will not have the thrust to get there, but may still fly faster than the 7X6. Just give it a shot.

My buddy flew with APC sport 7X7 but didn't have enough battery, TP Prolite 4200-3S 15C. He says he radared 109MPH. My 7X6 on high ESC timing advance and TP 3800-3S 22C gave me 111MPH. So that is proof that he was battery limited. If you want to try 7X7 let me test it on my motor with a wattmeter reading and get back to you. Order it anyway, worst case we will set you on low ESC advance, but most likely you'll be fine.

APC Sport 7X8 must be tested before you fry your motor. I tested a different brand which I am fairly certain draws more juice than the APC sport and that drew 102A 1050W. No need to go that far. Let me test for you. My buddy is ordering a bunch of APC C.F. props and I asked him to add to his order APC 7x7 and 7x8 for me to buy/test. Hang tight, will have those numbers for you soon.

Sooner or later you'll need a wattmeter, it is not just useful for prop selection. It has many other uses. I would imagine that you want a 2nd battery before that.
_____________________

tam popo,
16/25/4 1270KV.....Are you sure about the application? If you want to keep it tame, 16/25/3 1700KV can do that just fine with APC E 7X5 31A with TP 2100-3S 15C prolite, or it can be pretty wild and powerful with 2200-6S 20C 50+A APC E 6X5.5 without being maxed out.
Consider the whole setup before you buy the motor. For example ESC, battery, motor, prop, charger, speed, climbing, runtime, stall speed, etc...


Good luck,
Gryphon

Gryphon

Stryker_Viking thanks to you, my brother and XxOoCoBrAoOxX, I was finally pressured enough to do the right thing. Which is to cover my Stryker for the first time and to stop flying all white foam colored Stryker.

Here is one before the maiden, It still looks just as good. See you Thursday and get ready to do some flying with me as soon as the Stryker gets back to cali. I'll ship it over there soon.

Gryphon

maxamus

popo


no probs try here

http://www.astecmodels.co.uk/product...=motors&page=2


or here
http://www.puffinmodels.com/megamotor.html

but if your looking for a mega to go in a stryker give gryphon a chime he will keep you like so many of us on the stright and narrow

maxamus.......

tam popo

Thanks for that Maxamus, checked it out just now. Not much choice is there, does anyone mount outrunners. Just found perfect adjustable mount - its a fitting to mount reflectors on front/rear of bicycle. 2-piece bolted together with clamp for frame - motor goes in here. Fitted a spare 480 in no problem. Other end swivels and bolts to airframe - the beauty of this is its light, strong and above all adjusts the thrustline anytime. Putting it in one of my other planes and will see if will fit Zagi outrunner.
GRYPHON - are there any other makes/types of motor for F27b, either using "C" or "B" mount? Any help would be good. Q?: Do you have Welsh background, as gryphon is a welsh fire-breathing flying dragon!.Dioch an vow as they say in Wales -Thanks.

I.C.O.N.

My Feedback: (1)

Smoked my stock C motor yesterday. Hit the ground not all that hard, actually flattened out first.

Ended up bending the shaft a little more then it already was... when I tried to give it some power and it smoked... ok I got mad and gave it a LOT of power before it smoked. It was fun though...

Anyone have a Stock C motor lying around they want to unload for cheap? I am saving up for a 3DHS 300 Extra right now and don't want to spend money on a mega quite yet. Anyone have a good cheap alt for the stock C motor?

Thanks!
Andy

XxOoCoBrAoOxX

I think I was hitting about 108 mph with my 7x6 but I still need that need for some more speed. So Gryphon if you can go ahead and do that for me that would be awsome. I will then order the prop you recomended and see the difference in speed.

Thanks!

-Adisn

Mr. Mugen

OK fella's I am ready to commit to the dark side. I have a lot of stuff to work with. I was wondering how a eflite six 2000kv or a warp4 2 turn would work in here? I can order anything but already have these. If they are not a very good choice for it then how about a quick recommendation. I have read through some of this thread and seen many different things and set-ups. I have lots of lipo's and have a lhs with lots of different props. I have the stryker C and it is bone stock.......and I am bored with it. I need more speed! Money is not an issue for this project and I want it to be FAST! I have a watts up meter and all nessesary tools to carry out the full execution of this project, I just need some advise. By the way what is the stock motor rated at? I have up to a 60A esc available and have 2s,3s,5s lipo's. It looks like I may need a 4s from reading here. What can you's tell me? I will use all and any info. Thanks guy's and take care, Kevin

joe1

My Feedback: (9)

Hi All :-}
I have a question, is anyone else have a problem with their Stryker C motor mount breaking at the screw holes and the mount splitting at the top back, that is at the top rim.
I have only had two of them and both have broke at these places and this one only has three flights on it, it's like the plastic is to hard and does not flex without breaking.

Thanks everyone

Stryker_Viking

Good morning tam popo, well - it's morning here at least.

An alternative to the Mega that I can put my name and reputation under is the Medusa MR-028-056-2800 (2800kv)

I shouldn't speak for my friend Gryphon, but I know he is impressed by the numbers...
Hopefully he and I will fly on Thursday, maybe we will know better after that.

We found the following when we tested mine, Gryphon's Mega to the right:

<<<<Medusa MR-028-056-2800>>>> <<<<Mega ACn16/25/2>>>>
4S 4/16/2007 4/16/2007 4/16/2007 | 11/18/2006 11/18/2006 12/13/2006
Graupner CAM APC APC | Graupner CAM Graupner CAM Graupner CAM
Prop dia 5.5 5 4.75 | 5.5 5.5 5.5
Prop pitch 5.5 5 4.75 | 5.5 5.5 5.5
No load voltage 16.67 16.59 16.46 | 16.36 ? 16.5
Volt 13.44 14.21 14.35 | 14.46 14.55 14.62
Amp 100.4 85.9 76.9 | 76.5 76.4 78.1
Watt 1351 1221 1104 | 1106 1111 1142
Rpm 28880 35070 37410 | 29730 29820 29850
Pitch speed 150 166 168 | 155 155 155


Dimension (D x L) 28mm x 56mm 28mm x 56mm
Shaft Diameter 3.17 mm 3.17 mm
Weight g/oz 160g 115/4.1
Kv RPM/V 2800 2650
Io @ 8V 2.9A
Rm mOhm 7 mOhm
Pin 417W
I / Imax 54A / 65A 35A
Vmax 21V 19V

All Medusa Research motors are rated for 60,000 RPM operation
www.MedusaProducts.com

Good luck

Stryker_Viking

JPriami

My Feedback: (21)

I have been looking through this thread and seen many cool strykers. I just bought a F-27C RTF. I wanted to know whats the best prop I could put on the stock setup that might give it an extra edge over stock? I have tried a 6x6 in Real flight G3.5 and it seemed to speed it up a bit. But I just wonder if the stock set would handel that.

Gryphon

tam popo,

I wanted to mention, Medusa motors and also Neu.
There are other motors as well but you have not said your exact intensions so it is hard to mention everything.

As far the numbers above go, which are all for 4 cell lipoly, you can clearly see that the particular Medusa motor is very impressive.
If you look closer you will see that using the 5.5X5.5 prop it had severely lost efficiency since that was over propping the motor by far. It drew 20% more power than mine while producing lower RPM.
Note: The pitch of all props above was the same as their diameter.
Only radar testing will show if that 4S powered medusa on 5" prop or 4.75" prop can produce higher speed than mine, But most likely it'll be lacking a good deal of climbing in comparison to mine on 5.5X5.5 or 6X6(produced even better numbers and flying).

***If your intension is to stay on 3s that Medusa will be vey impressive. I was amazed at the numbers that it produced, we will have radar numbers soon.

Keep in mind that it is a good percentage heavier than the MEGA 16/25/X because it is not just a 480 brushless, it is an extra long 480 brushless, that is why it still fits the motor mount but is heavier.

I will recommend that motor for all out speed effort on 3S for a motor that fits F-27C mount.
First see which motor is easier to get in the U.K. and also check the service and repair time lines by contacting both companies. MEDUSA is in USA and MEGA is in Europe(cheqc...)
$5 price difference here in USA.

NEU motors are very expensive and I know they are located in SAN DIEGA in southern California, USA.

EDIT: STAY AWAY FROM HIMAXX IF YOU WANT AN EFFICIENT MOTOR.


Gryphon

mustgofast

wow, i bought mine 2 weeks ago, after putting my heli up due to lack of enjoyment in flying(working the controlls). its been about about 18 years between planes. i must say the 27c flies very easy and is quick. i also have a mini edge 540, but that will wait a until im more steady on the landings. i have flown several times and only 2 crashes, both where it glided too far and stuck itself into our fence.lol, a little glue and tape and its back in the air. YOU GOT A LOVE IT!!!!!! i did pull the trans and receiver to the side and use my dx6, just way better.

tam popo

Hiya Gryphon / Stryker Viking - thanks for all that info, but I'll be honest, its way over my head at moment, but I'm sure someone here will digest it! My intentions (lke any F27b newbie) are a gadual improvement of the Beast (b/less, LiPo, fuse etc) to improve my flying ability. Knowledge is everything. Having operation Thursday, will be armchair bound for 4 weeks then 2 weeks Spain (hoiday) but will use time to build 3 F27's using data on this thread. Speed is not my goal, control is. But others safety comes first. Condolences from UK flyers for the tragic events in Virginia.[]

wo23dodge

hit a few of the sites looking for an align 400L or 400LF,I run across these from time to time for $30 and with a 7x6 prop they rip it will fly circles around the stock C motor.

Gryphon

REQUIRED READING for many:

Please read page 4 of this article. Page 4 has some Myth's explained.
I learned that hard way last year. One of the Stryker Gods told me to read that page after I screwed up..
I see that the more people read it, the better.

http://www.castlecreations.com/media...01-Aug2005.pdf

Should take you 5 minutes or less and will save you money, Let me know what you think in a post or PM. Some people know the stuff, and some people need to learn it before it's too late.

Gryphon

Mr. Mugen

Great article! I learned something new today. Thanks for that!

stoney7713

Ok, I've just maiden my stryker with a 12T, 6x4 and 3S lipo, I'm very pleased with the results of such a cheap upgrade the motor was. I'd just like to thank everyone for the info they post here, it's been very helpful.

The B version is the most plane I've handled before this, so to me this is a major WOW factor, I plan on uping the prop size soon for more WOW factor.

Maybe I'll make it to that Mega motor before the end of the summer...

tims880

Oh yes...stoney and I fly together. I finally got my bugs worked out. Same setup as him but a 6 x 5.5 prop. Nice upgrade over stock. But the mega motor is calling me!

tims880

Oh one more.... never buy anything made by venom. Their batteries are junk and so are their esc's along with customer support!

ronrico418

I mocked up my settup today and then decided to test my DX7 which has been in the box for almost 2 months brand new.

Couldn't believe it but turned it on and there was a glitch in one servo. Upon inspection of the receiver I noticed one of my antenna wires looked like someone tried to pull the insulation back from the base about 3mm. I guess it's possible since at my LHS I'm sure someone before me had opened the box to look at it. So back to LHS and decided to take my 2 stock C motors with bent shafts and broken lipo charger. Joked with my LHS guy then asked him to call Horizon for me.


Thankfully Randy at Horizon Hobby customer support took the call. To my pleasant surprise there were NO hassles and no fuss. Just A1 customer service.

Randy took care of me and has new everything on the way. Thanks Randy


Gryphon, looks like another week at least I have all my props! Maybe I'll get this thing painted in the mean time since I have to now that your not sportin EPPXstream anymore! lol. How did you cover yours? Can I paint my Xstreme tape?

Stryker Viking, when I get done let's run our planes into each other at full speed. I wonder which motor will survive? muuuuuhahaha

Have fun Gryphon & Stryker Viking hope to see some vids soon. I should have one in the next 2 weeks.

It's a race against 100 pages pt 5 Gryphon



It's 2a.m. do you know where your LIPOS are?