Project QR-1 - Rutan Quickie Racer - Page 4 - RC Groups
Thread Tools
Feb 03, 2009, 01:19 AM
Registered User
Geode's Avatar

CAD Design Started .....

The scratch build started from a virtual world ......

Step #1 - airfoil selection/simulation
Step #2 - main wing, elevator, rudder definition
Step #3 - fuselage construction
Step #4 - put all the parts together

This is a lot easier than building the real one.
Sign up now
to remove ads between posts
Feb 07, 2009, 04:31 AM
Registered User
Geode's Avatar
Virtual world is quite different from real work perception. Planning on the 48" span but the fuselage is just unbelievably large. A 85% linearly scaled fuselage of 48" model seems to be a right size.
Feb 07, 2009, 01:38 PM
Registered User
Geode's Avatar

MG06, AG45c or Both ?

Two final contenders for airfoil selection. This pair seems to meet the following stability requirements from "The Text Book".

Two requirements are critical for stable flight:
- The front wing must stall before the main wing stalls
- The main wing must arrive at it's angle of zero lift before the foreplane achieves the zero lift

I'm also consider using the same airfoil for both front and main wings. Not sure how bad it will be on stability? Not sure which one will go faster in real world? MG06 or AG45c?

Last edited by Geode; Feb 07, 2009 at 03:27 PM.
Feb 07, 2009, 01:49 PM
Registered User
Geode's Avatar
Here is the preliminary target

Mass - 800g / 28.3 oz (guestimation)
Span - 122 cm / 48 in
Front wing area - 13.55 dm2 / 210 in2
Main wing area - 14.40 dm2 / 223 in2
Wing loading - 9.4 oz/ft2
Front / Main Wing aspect ratio - 8.2 / 10

Hope it's not too heavy to fly on my home slope.
Feb 07, 2009, 03:07 PM
Registered User
Geode's Avatar

Block Cutting

It's been raining for some time. Things start to get rusted on bolts and nuts

It's sunny and warm today in the sunroom/workshop. Time to warm up the machine and cut some EPP
Last edited by Geode; Feb 08, 2009 at 02:09 AM.
Feb 07, 2009, 10:53 PM
Registered User
Geode's Avatar
Plan is ready and the CNC cut files generated for CNC hot wire foam cutting...... Ready for some real action.
Feb 08, 2009, 11:22 AM
Registered User
Geode's Avatar
Been scratch my head for fuselage in the past few days .....

Love the fuselage of commercial EPP kit. Simple to made, but a lot of carving and sanding to round up the fuselage after EPP cut.

Considering chop the fuselage into 4~5 sections (something like this Duo Discus, but not exactly) . Hot wire cut to rounded shapes for each section then join together. A lot less sanding work needed, better matching between left/right halves, but might need some extra work for EPP preparation.

Any other "quick and easy" way for EPP fuselage formation?

Feb 08, 2009, 11:25 PM
ajroahkni's Avatar
With something as sleek (and weak *tailsection*) as that, I'd lean to cutting the fuse outline onto blue foam, sanding it to shape and then doing a lost foam fuse. I think about me trying to get an epp block reinforced and shaped like that and I'd end up with a very heavy epp fuse. I think you'd want it light for crash survivability, and no need for a bounce-able fuse, just a bulletproof 'hedral joiner and bouceability for the forward/anhedral wing.
Feb 09, 2009, 10:52 AM
Registered User
Geode's Avatar
I agree. Got to keep it light for crash survivability. And yes, I really don't want to repair the fuselage or the wing join on a regular basis.

I was thinking about EPP fuselage with CF rod re-enforcement. Hope this will bail me out of the troubles. The wing joint is a real headache. But you got a great point. Flexible for the front wing joint (just like the regular landing wheel) and firm for the main wing joint. I like the idea. Will do.

Feb 10, 2009, 01:49 PM
Registered User
Geode's Avatar

Fuselage Template

Slice up the fuselage. A few hours later, templates are ready for fuselage shaping. Now, waiting for EPP shipment.
Feb 12, 2009, 05:48 PM
Registered User
Geode's Avatar
Last piece of template before EPP cutting.....

Front & main Wings - done
Vertical tail - done
Fuselage - done

I should have everything covered. Ready to set for the real work soon.
Feb 13, 2009, 03:02 AM
3D Toy Designer
MicroRotors's Avatar
... Now the fun begins!

It looks GREAT ...

Latest blog entry: My New Toy!
Feb 13, 2009, 11:41 AM
Registered User
Geode's Avatar
Thanks Bill.

Can't wait to get back home to see the Fedex man bring home the EPP.

Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
trying to find CG for burt rutan quickie aaronredbaron Modeling Science 31 Jun 01, 2012 03:00 PM
A good Axis project. Stuart Warne Scale Kit/Scratch Built 57 Apr 27, 2005 07:27 AM
WTB: St. Croix Burt Rutan Quickie Matt Chester Aircraft - Fuel - Airplanes (FS/W) 0 Apr 19, 2004 01:19 PM
Info needed on the Rutan Quickie Mike Hall Modeling Science 12 Apr 16, 2004 06:21 AM
Scale PSS Project Mr B.... Slope 10 Jun 12, 2003 01:13 AM