Shop our Airplanes Products Drone Products Sales
Thread Tools
Jul 19, 2016, 07:22 AM
No RTF flies like your own SB
mperaltaoz's Avatar
Thread OP
Build Log

Critical Mass Racer - 1200 mm


UPDATE: added decals and updated specs as follows:
Motor: Turnigy 3548 790Kv
Prop: 11x10 2 blades
Much better with this combo

Hi there,

Starting a new project

I've come up with plans in Sketchup based on 3-views for the Hawker Sea Fury and overlapping pictures of the Critical Mass (find plans and capture below).

The specs will be as follows:

Wingspan: 1200mm (approx 1100mm after clipping the wings)
Weight: 1.2kg
Motor: NTM 900Kv
Prop: 10x8 4 blader
ESC: 70A
Battery: 4S 2200mAh
Last edited by mperaltaoz; Feb 12, 2017 at 01:26 AM.
Sign up now
to remove ads between posts
Jul 19, 2016, 08:57 AM
No RTF flies like your own SB
mperaltaoz's Avatar
Thread OP
I've cut and glued the main sections for the fuselage, the cowl and the middle section of the wing.
Photos below.

NOTE: I realised I it cut the fuselage in 3 sections only, as opposed to using all the formers in the plan. I finally did it using only 4 formers as templates: F2b, F10, F13 and F16. That made the fuselage a lot better with less joints.
Similarly, I built the cowl with only 3 formers: F0, F1 and F2a.
Last edited by mperaltaoz; Aug 01, 2016 at 05:36 PM.
Jul 20, 2016, 04:20 AM
Warbirds Lover
Dreamcatcher's Avatar
Subscrived ;-)
Jul 23, 2016, 06:34 AM
No RTF flies like your own SB
mperaltaoz's Avatar
Thread OP
Here's some more progress.
Installed all the internal trays/formers/snakes for servos and pushrods before gluing the two halves together.
Also cut battery hatch and finished cowl.
Looking good.
Jul 23, 2016, 03:22 PM
Build it and it will fly!
Ken Wright's Avatar
Jul 25, 2016, 05:48 AM
Registered User
Yoyocafe's Avatar
Cool plane!
Jul 25, 2016, 05:48 AM
No RTF flies like your own SB
mperaltaoz's Avatar
Thread OP
I got the wing done now. Sorry forgot to take photos of the parts but it is basically 4 sections and a spar holding them together.
Jul 25, 2016, 08:01 AM
Warbirds Lover
Dreamcatcher's Avatar
Cool !

You cut a couple of trapezoidal wing pannels then sanded them until you reached the good shape ?

That plane will be lovely ... :-)

Here are a couple of interesting drawings for the paint scheme :
https://www.rcgroups.com/forums/show....php?t=1989769

Have a nice day !
Jul 25, 2016, 08:55 PM
No RTF flies like your own SB
mperaltaoz's Avatar
Thread OP
Basically yes.
I cut the wing tips longer than needed and used a cardboard template for the airfoil. Then i cut them to shape and finally sanded for good finish.

I used this drawings to come up with the plans
Jul 26, 2016, 01:45 AM
Warbirds Lover
Dreamcatcher's Avatar
Thanks for the Answer Mario,

Very nice job, i look forward the next steps with great interest

Kind regards

Pascal

Jul 26, 2016, 06:12 PM
Registered User
bstanley72's Avatar
Which NTM 900Kv motor are you planning on using? The 300 watt one?
Jul 26, 2016, 07:00 PM
No RTF flies like your own SB
mperaltaoz's Avatar
Thread OP
No, the 815W swingwing a 4-blade 10x8 prop

Hey, it's a racer after all
Jul 26, 2016, 07:24 PM
Registered User
bstanley72's Avatar
Quote:
Originally Posted by mperaltaoz
No, the 815W swingwing a 4-blade 10x8 prop

Hey, it's a racer after all
This is what I was hoping you would say
Jul 26, 2016, 07:45 PM
No RTF flies like your own SB
mperaltaoz's Avatar
Thread OP
LOL...

I used to have that motor on my deceased Gee Bee Z swinging a 12x6 prop and it had a lot of grunt... I'm looking forward to the Critical Mass!
Jul 26, 2016, 07:52 PM
Registered User
bstanley72's Avatar
Over the last year I've turned my garage into a workshop and I've just started working with a hot wire cutter. My plan all along was to do a couple of easier/simpler builds to learn on, then try to tackle your F4U. However, now I'm thinking this could be my horse!


Quick Reply
Message:

Thread Tools