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Old Oct 07, 2012, 11:16 AM
Slipping the Surly Bonds
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Attica, MI
Joined Dec 2006
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FireFly in MPF

I have not been on this thread in awhile, but now that indoor season is upon us, I am looking to see if this design a good candidate for indoor streamer or full contact combat. So has anyone tried this?

I have reworked the design for MPF (Model Plane Foam). UAW is right at 7oz at the moment.

Motor will be a 1700 Kv Blue Wonder with an 8x4.3 prop. This setup will function well on 2s and be brutish on 3s.

Ken
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Old Oct 07, 2012, 02:13 PM
Winging it >
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Quote:
Originally Posted by dz1sfb View Post
I have not been on this thread in awhile, but now that indoor season is upon us, I am looking to see if this design a good candidate for indoor streamer or full contact combat. So has anyone tried this?

I have reworked the design for MPF (Model Plane Foam). UAW is right at 7oz at the moment.

Motor will be a 1700 Kv Blue Wonder with an 8x4.3 prop. This setup will function well on 2s and be brutish on 3s.

Ken
Ken, that should work very well. I've had good success with the3 FireFly (epp) in full combat; very fun.

I've built a depron FF and it flew very well too; probably faster than the epp builds due to the thin wing. I think the MPF build should be great. I recommend small 2s battery ; cg well back; for indoor. For outdoor, the 1700 kV motor and 3s should provide plenty of top speed.

I wonder if another KF layer on top (KF-4 I think) with lots of nice shaping in the leading edge would also be a good MPF build?

Looking forward to your flight report. Good luck!
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Old Oct 08, 2012, 03:06 PM
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United States, FL, West Melbourne
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Quote:
Originally Posted by dz1sfb View Post
I have not been on this thread in awhile, but now that indoor season is upon us, I am looking to see if this design a good candidate for indoor streamer or full contact combat. So has anyone tried this?

I have reworked the design for MPF (Model Plane Foam). UAW is right at 7oz at the moment.

Motor will be a 1700 Kv Blue Wonder with an 8x4.3 prop. This setup will function well on 2s and be brutish on 3s.

Ken
I used double layers of dollar tree. I sanded to the first layer of the KF airfoil and sanded the last giving more curve on the top. With the 1700kv and a gws 8040 it books. I am working on an emax 2215 1600kv at 16 amps with a 7x6 APC. I either have a bad ESC or a bad solder joint but I'll let you know how that goes.

Nice build
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Old Oct 08, 2012, 05:45 PM
Slipping the Surly Bonds
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Attica, MI
Joined Dec 2006
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Maidened the MPF FireFly today.

What an easy flyer. Used an 850 mAh 2s battery. She has plenty of authority with a flying weight of 7.8 oz. and just over 300 sq. in. of wing area. 3.744 oz per sq. ft. I know the epp ships are probably lighter, but this is very low loading after coming off the summer combat season.

It was a bit blustery out today, but the FireFly had plenty of penetrating power. Power off holding up elevator allowed for vertical descents (Fun!). Nice smooth roll rate. Noticed that the rudder acts more like an aileron as it easily rolled with full deflection.

I would like to put a strip of foam about 3/4" wide just outboard of the servo parallel to the linkage to stiffen the for/aft flatness of the airframe. These would be underneath and start at the control horn and terminate just in front of the hinge line.

Now for paint!
Ken
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Old Oct 09, 2012, 07:50 AM
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Originally Posted by dz1sfb View Post
Maidened the MPF FireFly today.

What an easy flyer. Used an 850 mAh 2s battery. She has plenty of authority with a flying weight of 7.8 oz. and just over 300 sq. in. of wing area. 3.744 oz per sq. ft. I know the epp ships are probably lighter, but this is very low loading after coming off the summer combat season.

It was a bit blustery out today, but the FireFly had plenty of penetrating power. Power off holding up elevator allowed for vertical descents (Fun!). Nice smooth roll rate. Noticed that the rudder acts more like an aileron as it easily rolled with full deflection.

I would like to put a strip of foam about 3/4" wide just outboard of the servo parallel to the linkage to stiffen the for/aft flatness of the airframe. These would be underneath and start at the control horn and terminate just in front of the hinge line.

Now for paint!
Ken
Glad you are enjoying the FireFly.

The stiffeners are a good idea for the MPF build...maybe for epp too. For indoor flying the epp will last far longer, but for outdoor flying the MPF or similar foams will out perform epp.

I've never tried the 1700 kV motor. I'm interested to here how it does on 3s with a fast prop. Should be pretty quick.
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Old Oct 09, 2012, 08:40 AM
Slipping the Surly Bonds
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Dan,
I have had excellent sucess with the 1700 on 3s with a 7x6 prop. No overheating issues. Makes sense to pitch down one and diameter up one to get similar power draw.

After closer examination of the tail flex condition, I believe it is the center portion behind the prop slot that is flexing up and down. I am going to try a CF flat near the elevon hinge line.

Ken
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Old Oct 09, 2012, 03:48 PM
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Emax CF 2812 @ 16 amps with a 1300 mah 3s
APC 7x6 prop
60% higher watts and I don't know how fast it is until I turn the thrust angle down and try this afternoon.
Earlier it was flying crazy fast and still gliding in the wind. Smoked my 3000 kv and my 1700 kv BW. Lead, I think it migh beat 60mph easy. Scary fast. Stryker C fast. WOW!
http://www.headsuprc.com/servlet/the...ushless/Detail
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Old Oct 09, 2012, 05:10 PM
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Originally Posted by Rickflaguy View Post
Emax CF 2812 @ 16 amps with a 1300 mah 3s
APC 7x6 prop
60% higher watts and I don't know how fast it is until I turn the thrust angle down and try this afternoon.
Earlier it was flying crazy fast and still gliding in the wind. Smoked my 3000 kv and my 1700 kv BW. Lead, I think it migh beat 60mph easy. Scary fast. Stryker C fast. WOW!
http://www.headsuprc.com/servlet/the...ushless/Detail
Rick,

Sounds like a great motor. When you say you smoked your motors...literally or this new motor beats them for speed and power?

Also on your Dollar Tree build did you use both a top and bottom KF? Couldn't quite tell from the description.
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Old Oct 09, 2012, 07:18 PM
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Rick,

Sounds like a great motor. When you say you smoked your motors...literally or this new motor beats them for speed and power?

Also on your Dollar Tree build did you use both a top and bottom KF? Couldn't quite tell from the description.
Smoked as in crazy fast. I would not be surprised at 60 mph!

Dollar tree is about 4.5mm thick. I depaper, cut out two parts each and laminate with craft foam glue. My speeder has split bamboo along the tail and skids. I also add split stakes of bamboo inside the double thick skids. Strong. I sanded all parts to the bamboo as that serves as a sanding guide so the rudder and skids are streamlined. I rounded the top to the third layer of the KF and rounded the final layer down. That added some speed with the 1700. This motor has 60% more power and it REALLY shows.

With the extra 1/2 ounce she still floats beautifully. I have added some down elevator mix for full throttle and up for takeoff. Still a handfull. I am adding a battery strap as it pulls really strong velcro loose at a high speed pull out.

All you need is a 20 amp esc and an $8.95 motor. Good to go! I will try to get video later and maybe a speed check.
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Old Oct 09, 2012, 08:02 PM
Old age is not for sissies
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Dayton Intl, Ohio, United States
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Originally Posted by dz1sfb View Post
Dan,

After closer examination of the tail flex condition, I believe it is the center portion behind the prop slot that is flexing up and down. I am going to try a CF flat near the elevon hinge line.

Ken
All of mine have done that, I stopped it with a reverse triangle of CF tubing (apex towards the rear) I had one with soft EPP that was impossible to do a low high speed pass, come out of a dive, try to level off down the runway and you automatically got up elevator.

Azarr
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Old Oct 18, 2012, 10:20 PM
A trail of smoke is GOOD!
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USA, TX, Springtown
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For Halloween, here is my Candy Corn FireFly.


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Old Oct 18, 2012, 10:23 PM
A trail of smoke is GOOD!
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USA, TX, Springtown
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Quote:
Originally Posted by Rickflaguy View Post
Emax CF 2812 @ 16 amps with a 1300 mah 3s
APC 7x6 prop
60% higher watts and I don't know how fast it is until I turn the thrust angle down and try this afternoon.
Earlier it was flying crazy fast and still gliding in the wind. Smoked my 3000 kv and my 1700 kv BW. Lead, I think it migh beat 60mph easy. Scary fast. Stryker C fast. WOW!
http://www.headsuprc.com/servlet/the...ushless/Detail
Can you post a picture of the motor mount you used?
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Old Oct 18, 2012, 10:48 PM
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Can you post a picture of the motor mount you used?
Already did.

http://www.rcgroups.com/forums/showt...0#post22502163

Plastic mount stick here

http://www.headsuprc.com/servlet/the...ck-with/Detail

The Blue wonder motors fit right inside the stick.

$7.95 smokin fast motor here

http://www.headsuprc.com/servlet/the...ck-with/Detail

Cut a square hole all the way through the foam for the stick and glue a basswood pad underneath. Drill and screw the stick. Use washers to adjust thrust angle. I think you could put some yaw adjustment in if you wanted to.

I think it is the best mount I've seen yet. I can't believe I thought it out myself!
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Old Oct 19, 2012, 09:41 AM
A trail of smoke is GOOD!
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I need the stick mount with the bigger base then. The one I have is too small. I will see if I can find one in stock. Thanks.
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Old Oct 19, 2012, 11:43 AM
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I need the stick mount with the bigger base then. The one I have is too small. I will see if I can find one in stock. Thanks.
All you need is the stick and a stick mount. Most motors have a mount for a 10mm stick. That is the size of the plastic stick.
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