moparmyway

We miss you on both threads !!

Check this out......................................just fiddlin round the last few months

Flightops_69

Hey Army!! I like the clean airflow to the engine!! I'm guessing the ESC in towards the front? Is that a Medusa engine? I've been out of it for awhile, been flying cheap 6 dollar motors for combat.

chippedprop

Rino
With the FJ it's much more streamline you'll be in the 110 to 125 range with unlimited vertical. Oh and you'll have a BIG smile as this baby will run rings around a Stryker.
You'll also get longer flight times due to less drag.
Cp

rino

My Feedback: (121)

CP,

From what I've read you like a nice flying bird more than going for all out crazy speed. Do you think I will be too heavy with the 16/25/3 Mega?

chippedprop

rino

During my beginning exp. with the FJ I have used many types of motors. I have used the size and weight of the Mega.
The Fj really likes to be as lite as you can make it. It will fly well with weight but is much harder to launch and land. I had to increase the servo travel distance to land as I would run out of elevon and nose it in with larger motor.
For me I like the small light powerful out runner. I am waiting on a new MicroDan 2900 kv custom build outrunner. It worked great on 4 cells with past FJ.
Speed was in the 110 to 120 range pulling 39 amps. Running a 4 cell 2500ma zippy battery.

The weight on the past FJ with battery was 21-22 oz. You can also get small out runners in the 3600kv range for really screaming fun...jets
Cp

rino

My Feedback: (121)

Which MicroDan are you using?

chippedprop

I have Dan build a custom for me. 2900 kv a little more then the 2800kv he stocks. The big diff. is that it is a lower resist. motor which makes it run more eff. and will come down cold running a 4 cell battery turning a APC 4.7 x 4.7 prop. which means I could run a more aggressive prop. It will also give a longer run time due to the motor not wasting power due to heat. The lower the resistance a motor has the less it wastes in heat = more power to the prop = more speed produced with a steeper pitched prop.
Custom motors still cost under 60 bucks which is why I use his products + they work and he stands behind what he sells.
He also can repair almost any motor starting at 30 bucks. I have a e-flight 2700 ready to pick up this week. It had a bad front bearing. So, instead of trashing it I now have a "new" motor. He's 40 minutes drive time away and he loves to fly so we fly ever time I go up. plus i learn about brushless motors and the whole electrical power system every time I visit.

He does ship. For me I'm more interested in the knowledge then saving the gas.
You can order the same motor just ask for the Chip from Spartanburg 2900kv motor he'll hook you up.
Cp

rino

My Feedback: (121)

What is the URL for his site. I would like to contact him.

chippedprop

http://www.gobrushless.com/shop/inde...lay&ref=splash
Click the contact bar at the top to send e-mail
Cp

TheTick

Hi guys,

Haven't read through the entire thread, but here's my setup.

ARC 28-47-2
5s 3000 zippy flightmax
6x4 apc
80 amp turnigy controller
1000 watts
sanded, spackled, fully glassed
Clocked it with a prospeed radar gun. 127mph level with light headwind.

It draws 1200 watts with a 6x5.5 but I didn't get it on radar. It may be a few mph faster, but not worth it IMO. 1000 watt setup gives tons of flight time and all components are happy. Very easy to hand launch at 60% throttle and lands nice and slow. For me, 120-130 is plenty speed for this type of airframe. It just takes too much power to go a little faster. I have faster planes to get my speed fix, but the FJ rivals them in the "fun" department. Hope this helps!

rino

My Feedback: (121)

Tick,

Is it still agile with the extra weight of the glass?




CP,

Can the Microdan handle the amps of a Mega 16/15/3?

Also, I wonder how the 7x7 prop on my Mega 16/25/3 would do on the Funjet? I wonder what the best prop for 1700KV would be on 4S. The Funjet is so small. Would you get a bemefit from going even larger. Say an 8x6?

Gryphon would probably have a word on this

Thanks,

Rino

TheTick

I've never flown a non glass version so I couldn't tell you. I glassed it because I saw a fast funjet flutter it's wings like a hummingbird before plowing in to the ground. I gotta say though, after sanding smooth the foam and filling everything with spackle, I love the smooth finish. This was the first time I ever glassed foam and it was incredibly easy. Used 1/2oz cloth and just brushed polycrylic over it. Once dry, just trim and sand the excess glass. I put the polycrylic on pretty thick, but it all just evaporates away leaving the glass nice and stiff. Next time, I'm gonna mix some baby powder in with the polycrylic so I can sand it for a super smooth finish. I found the whole process very enjoyable.

TheTick

I think you should build your power system around a 6" prop. 16/15/3 is gonna be pushing that little motor really hard on 4s unless you go with a 5" or smaller prop.

rino

My Feedback: (121)

Thanks for the input. I want to do 130 on a 4S pack. 120 would be OK and 140 would be OK too.

So, for 130 what is the most ideal power system.

I could go to an 8x8 prop on my 16/25/3?

Or how about a 15/3 on 4S with a 4.75x4.75? Can anyone calc that?

tIANci

I think the 16/15/3 on 4S will need a 4.7 x 4.2, I doubt she will hold out long with a 5x5 or 4.75 x 4.75. On 3S with those props she is already pulling about 30A-35A on the ground.

TheTick

The ARC 28-47-1.5 is a very proven 130mph setup on 4s with 6x4 prop and 80 amp controller.

Read this thread. Tons of good info
http://www.rcgroups.com/forums/showthread.php?t=744411

Flightops_69

Hey all, been flying my FJ with a Don's Wicked 3000kv, 4C, 4.1*4.1. Hehe, does not have the initial thrust of a 3C, 5*5 prop... but coming out of a dive at full throttle, racing down my street at 15 feet, towards my flying field (my house is across the street from a very large field) the kids would all whoop and yell! I dont know how fast she was going but was deffinatly faster then my stryker. I'm guessing 80mph range. Faster then the big wheels.

rino

My Feedback: (121)

Tianci,

what kind of speed do you get on a Mega 3 turn on 3S. Do you get to 110?



So, I am at a decision point. Go super lightweight like CP did for 110 mph? That's totally tempting because I know it would fly really well with few mods and I could land it anywhere. I just wanted to get to that 125 or 130 mark though.

OR

Get an HET, ARC or Mega 2600ish kv and and push 60 amps or so with a 6x4 or 6x5.5 etc. Way more power and acceleration but more weight too. These are 110 - 115 ounce motors plus you need a little bigger battery.

If I could just get 120mph level on that MicroDan I would be totally ordering one right now.

rino

My Feedback: (121)

ChippedProp,

How is the thrust on the 4.7x4.7 with the MicroDan. Do you get good extended vertical. Less than 40 grams is impressive for the power it delivers.

chippedprop

That would be a no.
Let check with a freind on the prop. He's on vacation so it may be a week.
Mega's are hard to beat on performance. my little motor is close and at only 60 bucks.
ARC makes a good 60 buck motor as Does HET

chippedprop

On 4 cells the vert is unlimited. you also better watch it cause it will go out of site this fast 1-2-3-4-5 gone vert.
It's a super motor
see for yourself

http://www.rcuvideos.com/video/Chipp...t-to-Music0001
Cp

p.s.
The speed posted is wrong ithink It,s 118ish can't remember as I was so pumped about the over all performance of the modified plane.
It was radered

rino

My Feedback: (121)

CP,

If I'm looking at the right motor on the Microdan site your motor weighs a scant 39g right? I like the weight. Also, Tianci thought that a 4.7x4.7 would be too much for a 16/15/3 on 4S. If I am not mistaken you are doing exactly that on 4S with your outrunner. Maybe it has more than a 16/15/3.

blanik213

Hey Chippedprop nice video I like the total flat deck mod to reduce the drag and the fact you made your own canopy that's creative.How long did it take to get Dan to custom build your motor. Woody

rino

My Feedback: (121)

I ran some numbers on CC's calculator.

Het 2w20 93g 4S 4.7x4.7 46A 172mph 72oz thrust. 3350kv

I have seen reports of this 50A motor pushing funjets to about 128 mph. It sounds doable based on what I see here. Acutally, 128 sounds slow. But, that's the speed I am after.

So, I'm down to this motor (which will work well on 3S too) or a much lighter Microdan. I need to confirm the 39g weight of the Microdan though and talk to Dan about about a 3300 kv version that will run a 4.7x4.7.

The Mega 16/15/3 seems to be a little small but might work just as well as the 2w20 in the end. I'm trying to make a good decision because it costs a lot to practice.

Looks like I am going to sell my Mega 15/25/3. It probably only has 10 flights on it but at 122g it's a little heavy for a fj and I am not at all interested in running 5 or 6S. I think it weighs more because it has the combat shaft.

chippedprop

Yup I run a APC 4.75 x 4.75 on 4 cells Motor will come down only warm about 100-101 degrees. Now remember on my build it was designed to do....
1-reduce the air blocking the prop and motor
2-reduce drag
3-increase speed by doing step 1 & 2
I can tell you that on a stock funjet the numbers WILL be diff. If you mount the Microdan on the outside of the stock plate it will help. Cooling may be and issue.

You can see from the video the plane is rock solid and has a wide range of flight speeds. The inverted pass was at real time film not slowed down

You can contact Dan on his web page under contacts. He'll work with you any way possible.

I am lucky as I can drive up to see him as needed. Oh and don't forget him can repair almost any motor for very cheap. Why buy a new one when you can totally rebuild for 1/2 price or less. Bent shafts... bad bearings... rewinds....demags. Folks this is a gold mine of motor repair and new motors.

He told me that Scorpion is coming out with a Inrunner line motor series very soon. Can't wait.

Cp