STRYKER F-27 Ducted????

[Mr-Tamiya]

Anyone ever make one of these F27's ducted from parkzone? and if so what EDF unit did you use? they say flying weight is a heavy 22oz, and I dont see any edf's that put out that kind of thrust any suggestions? :confused:

[Brett_Warwick]

I did.. Flew great and took alot of punishment but radio probs killed it in the end..

i used a minifan 480 with mega 16/15/2 and kokam 2000 15c

Mine was very heavy because of the covering i like a smooth finish auw was 900grams..

Was very fast yet could slow down for landing ..would recommend it too anyone

[Mr-Tamiya]

Nice! What did you use to make the mounts?I see they are not standard, who makes the mini fan? I was just going to bu the fuselage and parts to complete and use my own radio gear, Thanks!

[Nathan Wright]

Nice! What did you use to make the mounts?I see they are not standard, who makes the mini fan? I was just going to bu the fuselage and parts to complete and use my own radio gear, Thanks!

The mini fan is made by WeMoTec, it can be had at: http://www.warbirds-rc.com/

Also the Het-rc motors work great in them.(they can also be bought at http://www.warbirds-rc.com/ )

Nathan

[Tumbler]

had a loy of radio glitches with mine too til i aded an ultimate bec.

[Brett_Warwick]

The mounts are just made out of shaped solid balsa then sparyed with primer and painted.You might notice ive used long nylon bolts that go all the way through for strength..

The BEC was my problem too..but it was to late by the time i realised it..I wont make that mistake again.

Nice palne you have there is it an orignal stryker looks diffrent..

[Tumbler]

Thanks.

yes original styker with custom foam hatch and canopy

[Brett_Warwick]

what is it covered with.. looks like a smooth finish...did you grind the fake inlets off...and is that a graupner fan

[Tumbler]

i sanded inlets off yes. sanded and painted with testors enamel after a couple coats of polyurethane/baby powder mix.

[Vegasvince]

Gentlemen,

First and foremost, thank you for your inspiration for me to complete this project, i waited almost a year to do it then i just went for it and finished it in one night. I just want to let you gentlemen know that everything that gets posted here is put to good use.

Now on to the good stuff, a la readers digest version:

1) Had an E-flite Super Airliner DF, that i doinked into 80 pieces due to a cheap radio (lesson learned).

2) Both motors and housings survived, took one and put it on a dollar store foamie and fly it everyday.

3) Took the other and mounted it to my battle worn Parkzone F-27 Stryker, with over two hundred flights and crashes -- LOL!

4) No special method used to mount the fan housing except epoxying it on to the rear.

5) Radio/Motor/Battery Gear: Hi-Tec 3 channel radio, 30 amp brushless speed control (dirt cheap on e-bay located here: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEWNX:IT&item=130209313797&_trksid=p3984.cWON.m313.lVI(quick delivery), Thunder Power 11.1 V, 2100Mah lipoly, e-flite BL400 Ducted Fan Outrunner, 3500kV and lots of tape (you can see it in the pictures)

6) C.G. spot on thanks to you guys, needed to add 1 ounce to the nose to get it perfect (see black tape on nose)

Had the maiden flight today, and it was nothing less then spectacular, almost 8 minutes on the battery pack, but it was very windy so i decided to land. It was blistering and flew like a champ.

Thanks Again Men!
Vincent

[kahloq]

I did a twin EDF setup. Two e-flite park 370-4200 inrunners in GWS EDF55's housed in GWS A-10 nacelles. Flies quite well on evcen just a 2100 3s 15c.

[sdflyguy]

Hi - new to EDF flying. I modified a Stryker -C with a 58 mm cheapy ducted fan ( six blades) that came with a motor installed. It is just glued to the top of the stryker mount with no ducting except that around the fan - does this matter? Using a 60A ESC and a 2200mAh 3 cell 35C battery, it draws 48 amps and developes 550 watts. Nevertheless, this combo makes for a slow and underpowered stryker. :censored: Where did I go wrong? :confused: Thanks for any help!

[kahloq]

Whats the kv of the motor installed in that 60mm fan?
On mine, even with two smaller fans and not very beefy motors, it flies pretty decent. The kv Im running is 4200. So, on a 3s battery, thats about 48000 rpm's steady on a charged battery.
The pitch of many decent fans are about 3 to 3.5, so with an rpm of 48000, that equates to about 136mph static(for a 3 pitch)....BUT....ducted fans dont produce near as much thrust as a regular prop, so half of that "speed" is sucked up trying to get the plane just to move. So, half that 136 and you get about 68mph flying speed. Doesnt seem that fast for a jet type plane, but it flies well. However, my fans are also surrounded by foam ducting(from a GWS A-10) that directs that thrust power in the right direction.

On yours, with as much amp draw and watts your pushing, it should leap out of your hand like no tomorrow....EXCEPT, you have no ducting at all like you stated. The fan housing itself is giving you very limited eflux. Gobs of thrust, but it probably is spreading out very quickly and this is why i think yours is flying slow. Think of it this way...take a house hold fan. Turn it on high and you get a lot of air blowing, enough to push papers and such off a table or whatever, but its not directed at all so the papers just go everywhere. Just a lot of wind. Now...take a straw and blow through it at a piece of paper and you can easily blow that thing of the table without turning yourself blue because its a lot of pressure directed at a targeted spot. This is what produces the thrust you want for decent speed.

Can you get some thin plastic or mylar sheeting and create a tube maybe 4"-6" long and attach it to the back of the fan housing? I'll bet you will see a huge difference.

[cray2602]

I think you would have better luck with a larger fan and lower kv motor. You probably have a crazy amount of velocity but no thrust. 550 watts on 3s battery in a 58mm fan, i would guess your motor is at least 5200kv or maybe alot more. That motor and fan is built for a small light weight jet, in which it would probably rip. You just need less velocity and more raw thrust IMO. Small fans move the air through at a high velocity but with low pushing power, larger fans have more pushing power but lower velocity. Thats not always true across the board but for simplicity sake thats kinda how it works.

[sdflyguy]

Thanks guys. Gives me something to think about. I still don't understand a lot of the electric terms. As they say, " I'm a slow learner but I DO retain poorly!", I will try the exhaust ducting and see if that helps. I do have 2 fans, but with the numbers I saw on the amps and watts, I would need two ESCs and two 2200 batteries - - and a truck to lug them around. No speed or performance there. If the duct does not work, then I have to decide wheither to reconfigure the ol' stryker as a pusher prop or spring for a bigger fan/motor.

[cray2602]

If you put 550 watts into the Styker as a pusher prop it would be fast. EDF's are amp hogs, they take a ton of watts to make anything fast. They just are not efficient at all when compared to a prop. But they do have the cool factor.

[kahloq]

I dont think needing a bigger fan is the problem for him Cray. His plane is flying slow because hes NOT producing the thrust to get the plane moving because there's no ducting at all.
Your suggestion would sure work, but Im trying to help him get his current setup to function so he doesnt have to spend money on new parts.
Also a larger fan/lower kv motor may not make the plane fly faster and will add more weight which he'll have to adjust for.

If making a thrust tube doesnt help then yeah, Id also say use a bigger fan unit. In this case, id say a wemotec 70mm fan and a little screamer jetscreamer 1400. Both can be bought at www.hobby-lobby.com

[cray2602]

It would definately be worth the effort to try a thrust tube first. Ive seen a 20% increase in static thrust from making a thrust tube before, sometimes you get a big gain and sometimes you just dont. Also make a nice lip for the fan if it doesnt allready have one. Intake is just as important as exhaust.

Something just doesnt sound right with the setup so you might be right kahlog. 550 watts in a 58mm fan should easily push a 500~600 gram plane around at about 70mph or better assuming its a clean airframe. I dont know what the AUW is on a Stryker but its probably somewhere in that range i would guess.

[sdflyguy]

Thanks again for all the thoughts, guys. I did try the exhaust tube - - no change and while it flew, it paled beside the original stryker. I think I will reinstall the original stryker motor and crash it a few more times before I buy anything else. I can do that for the price of a new motor mount right now. Eventually I wll probably try the setup you recommend above with a 70 mm fan and a good motor. Eventually I will have to buy a new fuselage anyway, this one has a definite banana shape and is about 1 1/2 inches shorter than the stock ship. Thanks again! :D

[alpea 41]

I just found this thread or I woulda posted B 4 . Here's a Sukhoi SU 37 Super Flanker I made outta a Stryker wing body, some 6mm depron and Pringles cans for EDF tubes with twin H K cheapie 64 mm EDFs. It was 1st done as a pusher but thrust issues were bad. But it maidened today as a twin EDF and it flew real nice http://www.youtube.com/watch?v=nsiR8CD9E5g And here's a build thread I did on it if you are interested. http://www.wattflyer.com/forums/showthread.php?goto=newpost&t=48733 The 2 EDFs drew 58 A W.O.T. I had a 30A ESC on each and it flew on a Thunder Power Pro Power 2200ma 30c 3s

[cray2602]

Thats a cool idea.

[sdflyguy]

SU-37/stryker : Holy Schmidt! That is absolutely awesome. How long did it take you to make the conversion? As you happy with how it flys?

[sharkbyte]

I built this one several years ago and it still flies great and surprisingly quiet. Wemotec on 4s.

[alpea 41]

sdflyguy, Took about a month cuz 9 day vacation with familly got in the way . And 1st it was a pusher. But build time it was quick. That flight was maiden so I was happy to see it has potential. The stabs have a little play gotta fix that and make a canopy and paint it.

[alpea 41]

Put flight 3 and 4 on it today. Here's the video http://www.youtube.com/watch?v=OfKpyG1O9Bg

[CRCJA]

I know not of what you speak of!!!!!!

I have owned as many as 20 Strykers over the 5 or 6 years that they been available. The first ones where dull and slow, so after about 4 or 5 Strykers I went to Brushless and EDF. The first where not Modified at all, and even after I went to brushless, I still did not modify them properly only the Motor and radio was changed.

From there I learned the hard way to add strength to the area around the motor mount since the motor literally ripped out of the fuselage with mount and all. Then the second attempts, I again found out the hard way that it needed so way to stiffen the wings, because they flexed and bent half way out. Including haldaldf the elevator/aileron. So I added a carbon rod / arrow shaft to the body, but I did not go all the way out, only till about the length of the aileron, and what do you know, It flexed and bent again but thins time only the last four inches of the wing DAMMM IIITT.

So move over to version 3 and 4. Every Jet Rally I would take my 100+ MPH styker too, they would tell me it's not a jet so I couldn't fly it. So I cut the mount and added a DF. I have used the HET and currently the Mini Fan Pro and Can still be you my DF Stryker does 100+MPH.

I see some of you got creative on the mount, but since the original mount was at the right angle, I just keep on that. I cut the ears off the fan and the Stock styker mount and glue the fan to it.

Current set up is Mini Fan Pro Mega 16-15-3 and 4S 3000 25C (it really needs 30C or better at this rate) 750 Watts and 59Amps, the EVO battery really warns up so I need to step it up.

Now if you can make your Stryker do an Inverted Flap Spin, I will tell you that mine does them Very Violently and has know to throw the battery out of the plane even though it is Velcro and hatched is secured with a screw.

Turbulence

[CRCJA]

Here is the current Modification for all current Strykers that I have. I always buy the B Version painted ($70-$80) or unpainted (about $40) Three carbon Spars on the Bottom.

Turbulence

[CRCJA]

Here is version 4 with a DF. Originally I had a Castle 80 under the plastics, but when it gave out, I only had this Hiffel at hand and it didn;t fit, so I mounted it on the outside where it could cool better.


Turbulence

[alpea 41]

CRCJA , Sounds like you and I and Sharkbyte are the only ones flying a Stryker on EDFs. WE put flight #5 on mine Sat. at a club scale war bird fun fly. They got a kick outta my Pringles cans engine tubes