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Nov 22, 2003, 02:07 PM
Leave me alone!
Martin Hunter's Avatar
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I created the RCplane which never breaks! Part 2

Hi gang!

This is the continuation of the hugely popular thread started here:

Carry on, gents

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Nov 22, 2003, 02:38 PM
Registered User
pappatop's Avatar
Flight Test Report:

Conditions were very windy, 20-30 mph gusts. Location was a hay field w/ grass about 12" high.

Motor is a PJS 3D 550
E-tec 1200 3S1P LiPo's
Castle Creation Phoenix 10 Speed Controller
Flying wt: 14.5 oz. (too much glue)
Shortened Tail Feathers & removed tape to compensate for the weight. Worked OK!
CG 1-1/2 to 2" behind spar.

Controls, all I could get using:
4-Hitec HS-55 servos (1 per wing)
Elevator and Flaps mixed 80%
Hitec Electron 6 Receiver
1/16" landing gear using 2" MPI Indoor Light Wheels
w/ Tygon fuel tubing as retainers
Graupner 3668 control horns glued in w/ Marine Goop

Hand launched, or should I say rocketed, with minor adjustments to trim. Wind played havoc but this plane shined like a diamond. Had a crowd of 5 watching and ooooohing. Crashed 5-6 times, cartwheels & straight in with minor damage, nothing we didn't fly away from. She would hover @ 3/4 throttle. Loops in a 3-4' dia. circle. Rudder will loop the plane from a knife edge in about a 10' circle. Flared great for landings! She flew like a dream and handled very stable, even in the wind! Had more control than I knew what to do with. Oh well, crashes didn't hurt!
Last edited by pappatop; Nov 22, 2003 at 02:51 PM.
Nov 22, 2003, 02:48 PM
Registered User
pappatop's Avatar
Here's what she looks like after the flying!
Nov 22, 2003, 03:24 PM
Registered User

In your test flights, did you try any high speed low level passes with a quick pull-out or something where you were pulling lots of Gs. The reason I ask is I wonder how the wings and fus held up to G forces with a fast change of direction at high speed. Also, at straight out high speed does it tend to flutter or vibrate?
Nov 22, 2003, 03:25 PM
Registered User
Twistedprop's Avatar
Nov 22, 2003, 03:31 PM
Permanently Banned
Larry3215's Avatar
Gotta get me one toooo!

Wonder how it will do with an Axi 2808/24?

Nov 22, 2003, 03:44 PM
Registered User
pappatop's Avatar
Full throttle calculates about 24-30 mph. She was stable as a rock at full throttle!

goin' to the park to fly again! HeHeHe!
Nov 22, 2003, 03:55 PM
Foam Flyer
Depdog's Avatar
Great report

Nov 22, 2003, 03:59 PM
GenesisCreation's Avatar
Congratulations on job well done Pappatop!

So after flying the plane what changes or improvements do you have in mind if any, before going into production?
Nov 22, 2003, 04:24 PM
Registered User
pappatop's Avatar
Landing gear too flimsy! Don't fly on concrete, road rash very unforgiving!
Nov 22, 2003, 05:24 PM
Shula Who??
GW's Avatar

Mark Roberts delivers!!!

Got my kit in the mail today. One word. AWESOME!!!
This guy can cut some foam. Beautiful work!!
I build several pattern planes for folks all year long, and deal with alot of Foam for pattern wings, I dont know squat about EPP, but I know good foam cutting, and this my friends is nice foam work.

Even included a parts list, checked off by hand so as not to forget anything in packaging.

Kudos Mark.

Anyone interested in a photo buildup of Marks kit?
The mods may want a different thread started as this one is getting long. I may ask them before I start it if anyone is interested.

Martin Hunter?? New thread, or do it in this thread ? It will be several photos and comments i would think.

I dont think anyone who has ordered will be the least bit disappointed in the kit.


Last edited by gw-ezone; Nov 22, 2003 at 05:27 PM.
Nov 22, 2003, 05:40 PM
Experienced R/C Repairman
barnyardflyer's Avatar

Mark must have brought it himself!

I just got home from work and found the Mark Roberts kit in my mailbox!

I can't believe it got to Michigan so soon.

Thanks Mark.

I think a thread for beta testing this plane should be started.

How about calling it "Mark Roberts Southern X2"

Nov 22, 2003, 06:23 PM
Registered User
Y_Sekiai's Avatar
Congratulations, Mr. pappatop!
I as well as you am excited!
Landing gear needs to be reinforced.
The photograph of my landing gear.
Nov 22, 2003, 06:29 PM
Registered User
pappatop's Avatar
Originally posted by GenesisCreation
Congratulations on job well done Pappatop!

So after flying the plane what changes or improvements do you have in mind if any, before going into production?
A number of changes.

The original with the long tail moment has too short a nose. I will move the wing back on the fuse to allow for a better balance. The control surfaces are too big, way more than needed. I & my son both fly 3D profiles, and though this plane isn't overly sensitive in it's current state, I had cut the elevator in half and cut 3" off the fuse bringing the hinge point of the rudder even with the elevator hinge point.

I originally did it to shed tail weight but found the elevator more than adequate to 3D and it will turn a 3-4' dia. loop with flaps mixed in!

That's alot of elevator. I still need to test without flaps and see if it's ok, right now is sooo windy! Maybe tomorrow it'll die down.

This thing slow rolls like a dream. Rudder is cut way down also and it will do a loop out of a knife edge about 10' dia.

That's alot of rudder. It also doesnt need all the tape either. It's plenty rigid with the carbon rods. I did have to wrap one place on the rudder vertically to stabilize it!
Nov 22, 2003, 06:45 PM
Registered User
I have a Hacker B20 12L with 4:1 gear box and a Castle Pheonix 25 esc. How will this plane fly with this combo? I have nickle metal packs for this combo, which would be heavy for this plane. Are the lithiums able to deliver enough juice for the hacker? I recorded 16A max with an apc 11x4.7 prop. I wonder how the weight compares between the two motor combos.


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