RE: FUNJET

RE: FUNJET
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RE: FUNJET - 4/20/2008 10:30:19 AM

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Have you seen this one Tianci. Mega 16/25/3 on 6S. Blinding quick. Might try it myself if I figure out how to fit a 6S3700 pack in the darn thing. Wish me luck. Off to maiden flight my 2.2m Yak.

http://www.youtube.com/watch?v=Qh_4oqh-o7o

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RE: FUNJET - 4/20/2008 11:45:59 AM

tIANci

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Ditchit -Yeah watched the video ... its fast. I am too lazy to fly such a big plane ... 2.2M ... hehehee ... don't you think with a 6S 3,700 pack she will be like a flying brick? I am thinking EVO25 6S 2,170s to keep her light. Gonna finish my FJ tonight, will be quick. The try to maiden her by Wed if I can ... so its going to be Mega 16/15/3, APC 4.75 x 4.75 and Flight Power EVO25 4S 2,500. I am happy with a pitch speed of 170 mph.

I ran the figures on ECalc and on 3S I can still get 132 mph pitch speed on a 5x5 ... that's pretty decent especially when I am only pulling about 32A. I can still outrun most of the 40 sized nitro planes ... heheheheeee ...

< Message edited by tIANci -- 4/20/2008 1:17:18 PM >

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RE: FUNJET - 4/20/2008 6:21:16 PM

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At the speeds you guys are flying, do have a lot of expo programmed into your radios? What about your servos, do you guys have the control rods in the hole with the shortest throws? I've had my FJ for a few weeks and feel its just to quick with standard settings.

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RE: FUNJET - 4/20/2008 6:31:12 PM

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I use 60% expo on just about every model I fly. It's all down to personal preference ultimatley.

Flew my FJ this morning but CG was too far forward for some reason. Landed fairly promptly and tore off the rear part of the fuselage. Easily fixed with some gorilla glue. Maiden flight of my 2.2m Yak went really well though, which made up for it.

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RE: FUNJET - 4/20/2008 7:29:10 PM

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Guys,

The Funjet in this video is faster:
http://www.youtube.com/watch?v=U871_XZ_ACY&feature=related (camera work is not good).

This Funjet was measured 1 MPH slower than the 150 MPH Funjet in the post above… but that was on radar and with a nearly spent pack. So it may be capable of closer to 160 MPH runs.

Assuming that it may have been thrust limited due to small prop, I believe the 16/25/2 2650KV would be better with slight advantage in every dept. than the 16/20/2 3100KV on 5S.
___________________________
ditchit,

You have the BEST battery possible. No other battery when running any of the 28mm MEGA motors can help a Funjet fly faster.

I believe your battery is KING as far as any Combo of MEGA and Funjet, not even a 6S-3700 can do better due to combination of KV and cell counts and prop size for needed thrust (Without going to HV ESC for 7S+ operation with lower KV).

So no need for fitting a bigger pack, you’ve done the hard work already and have the best pack…The guy in your video had a 1700KV motor and the cells were not even working hard because the motor could not take much more amps.

Of course there is other brand motors with different KVs.

I honestly believe you can hit about 160 MPH with your 5S-3700 25C pack at the 85A range with right motor…and it would have a much easier time of it then the 5S-3300 in the video above (in this post). May fly even faster than that with more power from same pack.

I use 60% EXPO on high speed Strykers too.

Have fun,

Gryphon

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RE: FUNJET - 4/20/2008 7:30:36 PM

tIANci

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quote:

ORIGINAL: ditchit

Flew my FJ this morning but CG was too far forward for some reason. Landed fairly promptly and tore off the rear part of the fuselage. Easily fixed with some gorilla glue. Maiden flight of my 2.2m Yak went really well though, which made up for it.

Now the landings are an issue ... at first it was the launches ... heheheheehehhee ... hey seriously ... you flew on 5S? Mine is almost ready, just have to decide on the ESC, I got to none to spare so I need to get one.

< Message edited by tIANci -- 4/20/2008 7:32:18 PM >

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RE: FUNJET - 4/21/2008 11:46:23 PM

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I run the rods on top holes. If you have a comp. radio you can change the throw in the radio. I use dual rates. Low to fly high to land or to do crazy stuff at low speeds.
Remember that you can adjust the thrust angle on the FJ to help the plane fly level if your running a Large batt. and the CG is super nose heavy.
Buy added some up thrust it will make your servos not work as hard to try to keep the plane level.
With the mods. I have made on the FJ it has a problem slowing down to land. i have to land at 10-20 mph as it just wants to keep going.
On the next build-coming soon-I'll go with a little longer elevon so I can slow it down. May copy the org. foam elevon design - we'll see.
I can see the plane twitch when I shift into high rates at speed - hey you got to know what happens
FLY on
HOW about some more vids.

< Message edited by chippedprop -- 4/22/2008 5:05:11 PM >

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RE: FUNJET - 4/23/2008 6:09:54 AM

tIANci

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Maidened my FJ on 3S today ... what a total let down! The motor tached only 23K whilst ECalc says about 28K. ESC was set on high timing, I will try again later with a 3S 2,500 and see how she goes. Total disappointment ... but the plane flies nice ...

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RE: FUNJET - 4/23/2008 10:34:53 PM

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Vectored thrust:

Guys check out the videos on this site:

See the top one first.

http://vektor-technik.de/index.php?option=com_content&task=view&id=1&Itemid=27

Enjoy,

Gryphon

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RE: FUNJET - 4/24/2008 1:56:43 AM

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I think there is also a video out there of a funjet or a microjet with thrust vectoring, except that the person actually uses a real turbine. From what I can remember, it's been around for about 2 years somewhere in Europe and the guy has brought it to several places to demonstrate the capabilities of a turbine powered funjet/microjet with thrust vectoring.

I don't remeber where I saw this, have any of you guys seen this too...I saw it some time within the past 4-5 months on the web.

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RE: FUNJET - 4/24/2008 4:10:05 PM

tIANci

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Got a few flights in today ... this weekend she is going 4S!

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RE: FUNJET - 4/25/2008 9:06:48 PM

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Back to my Funjet to get it ready for tomorrow now I've conquered my Yak project. Going to push the motor a little harder. Using a 4.7 x 4.7 APCe last but have got a 5 x 5.5 APCe (cut down from a 6 and balanced). Got these numbers. Think I may get a motor for 6S next... 16/25/2

17.34 Volts
43.2 Amps
0749 Watts
? RPM (Tomorrow - bad light at mo)

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RE: FUNJET - 4/27/2008 3:57:46 PM

tIANci

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quote:

ORIGINAL: ditchit

Back to my Funjet to get it ready for tomorrow now I've conquered my Yak project. Going to push the motor a little harder. Using a 4.7 x 4.7 APCe last but have got a 5 x 5.5 APCe (cut down from a 6 and balanced). Got these numbers. Think I may get a motor for 6S next... 16/25/2

17.34 Volts
43.2 Amps
0749 Watts
52,375 RPM (Tomorrow - bad light at mo)

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RE: FUNJET - 4/27/2008 5:06:11 PM

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Thanks Tianci. My mate reckoned the numbers didnt seem right compared to other tests I've done with other props. So I stuck to the 4.7 x 4.7 APCe for our club picnic yesterday. My mate Murray turned up with his 3S powered FJ and I whipped his butt on every pass....but he did fly for about 5 minutes longer than I did. I've removed the wing tip pods from mine and cut down the fins by an inch. To much fun flying this awesome piece of foam.

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RE: FUNJET - 4/28/2008 7:25:15 AM

tIANci

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Ditchit ... hey I was just joking about the numbers!!! I just thought of something absurd and put it in ... those are not real figures, heheheehehee

Hey enjoy the pics below ok ... tell me what you guys think ...

Both planes are about the same size, talk a close shave ...

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< Message edited by tIANci -- 4/28/2008 7:26:13 AM >

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RE: FUNJET - 4/28/2008 7:31:01 AM