HobbyKing.com New Products Flash Sale
Reply
Thread Tools
Old Oct 10, 2010, 11:37 PM
HobbyKing
Paul Susbauer's Avatar
Hong Kong, Hong Kong Island, Hong Kong
Joined Apr 2001
4,507 Posts
Build Log
De Havilland DH-53 Hummingbird 53" of course

After taking about a 4 year break from building airplanes to ride dirtbikes, a recent injury has left me relatively housebound except going to work, so what to do I do...build airplanes. (Ironically it was not the dirtbikes)

Enter the DH-53 which I've been staring at photos of on my computer for a couple years. How big? Most of my planes seems to be 40-45" span, lets make this one a little bigger. How about 53" wingspan...which I didn't realize the coincidence until about 3 weeks into the design.

Original Goals:
1) Stick fuse
2) 1 Piece Wing
3) Scale working cables, which will prevent #2

Design Problems:
Loooong Tail Moment
Short Nose

Final Solution
Laser Cut everything possible, only about 4 sticks in the whole plane.
Scale working cables
Moved Everything as far forward as possible.
Two piece wings due to scale cables

For the nose weight, I wasn't terribly careful about weight up front, plus I figure I can just use a bigger/heavier motor. I don't need much power. I have it set up for a Venom V35 Outrunner, to be run on 3S 4000. The battery is removed through a removable hatch on top of the fuse, from the cockpit to the firewall. For the rudder/elevator servos, it is designed for HS-81 servos, accessed through a hatch just behind the firewall. Both are linked to their scale bellcranks.

The tail uses laminated bows, and scale rib spacing.

Wing, also uses scale rib spacing.

The CAD file says 40 hrs and 2 minutes total editing time...not bad. 302 parts....10 sheets of balsa. etc...

Big thanks to Joe Pierson who has been digging around finding a lot of detail photos for me.

I just finished the design tonight and sent the file off to Charlie... until then, please enjoy these nice screen shots of my design progress.

More to come.
Paul Susbauer is offline Find More Posts by Paul Susbauer
Site Sponsor
Reply With Quote
Sign up now
to remove ads between posts
Old Oct 11, 2010, 12:07 AM
The Hun in the Sun
vonJaerschky's Avatar
Canada, BC, Comox
Joined Nov 2003
7,393 Posts
What a great subject! It is always nice to see a rare bird being modeled. Looking forward to following your build.
vonJaerschky is online now Find More Posts by vonJaerschky
Reply With Quote
Old Oct 11, 2010, 08:07 AM
Neophyte hacker
portablevcb's Avatar
Albuquerque, NM USA
Joined Sep 2003
15,660 Posts
Is there room to put the battery vertically behind the firewall? That's the only way my YMF got balanced.

Parts will be cut tomorrow

charlie
portablevcb is offline Find More Posts by portablevcb
Reply With Quote
Old Oct 11, 2010, 06:04 PM
Registered User
USA, CA,
Joined May 2001
1,708 Posts
De Havilland DH-53 Hummingbird

Hi Paul,
Now that is going to be a really Neat, Scale flying DH-53 Hummingbird And I am going to get to be one soon!! Paul is doing great job designing a Neat Electric DH-53 This Airplane has a lot of "Character" And I need a brake from riding my Indian
Joe Pierson
Joe Pierson is offline Find More Posts by Joe Pierson
Reply With Quote
Old Oct 18, 2010, 08:41 PM
HobbyKing
Paul Susbauer's Avatar
Hong Kong, Hong Kong Island, Hong Kong
Joined Apr 2001
4,507 Posts
Parts arrived

Welp...Parts arrividerchied from Charlie today, looking great as always. Thats a lot of balsa for such a small plane.
Paul Susbauer is offline Find More Posts by Paul Susbauer
Site Sponsor
Reply With Quote
Old Oct 19, 2010, 05:26 PM
One cell short of a Pack
steve1814's Avatar
Good ole Smithsburg, MD
Joined Mar 2007
1,898 Posts
Now that is an impressive stack of parts! Looking forward to following this one.

Cheers and good luck!

Steve
steve1814 is online now Find More Posts by steve1814
Reply With Quote
Old Oct 20, 2010, 09:01 PM
HobbyKing
Paul Susbauer's Avatar
Hong Kong, Hong Kong Island, Hong Kong
Joined Apr 2001
4,507 Posts
First bit of progress. The top battery hatch is the forward bit of fuselage decking you see. Its all just slotted together, no glue yet.
Paul Susbauer is offline Find More Posts by Paul Susbauer
Site Sponsor
Reply With Quote
Old Oct 21, 2010, 11:11 AM
Warbird crazy!
new2rc's Avatar
United States, CA, San Mateo
Joined Sep 2004
3,738 Posts
Very cool!

Yet another must de Havilland .

John
new2rc is online now Find More Posts by new2rc
Reply With Quote
Old Oct 21, 2010, 02:43 PM
Obstinate spurious drone
jeff edmondson's Avatar
Cost-ifornia, 90045
Joined Feb 2003
252 Posts
The 53 is a very compelling subject. It practically shouts "fliver". Could be a wonderful slowflyer.

She is an alluring siren, with a weight problem. In particular it is the mass moments. The Venom V35 will indeed provide excess power, if she is capable of scale like flight. Solving her balance issue with large lumps of motor and battery are going to steal her light plane flight charms.

I am doubtful that you have enough margin in your design to solve the long tail moment issue yet. My guess is that all that lumber, aft of the C.G., in the fuselage, is going to drive you to add ballast in the nose.

Tuned in, and eager to see this bird fly.
jeff edmondson is offline Find More Posts by jeff edmondson
Reply With Quote
Old Oct 21, 2010, 03:07 PM
Single-task at best...
tim hooper's Avatar
Telford, UK
Joined Feb 2000
7,493 Posts
Paul,

Love the work so far!

That short nose and long tail do look daunting, don't they?

The only way to ameliorate the problem (IMHO) is to really minimise all the wood aft of the CG, move all the hardware as far forwards as possible, and then add ballast as necessary.

Once upon a time, us e-flyers used to treat ballast as the Most Evil Thing in Creation (given the limited power/heavy cells combinations that were open to us), but these days we have as much power that could ever need, so adding a tad of weight is no longer the cardinal sin that it once was!

tim
tim hooper is online now Find More Posts by tim hooper
Reply With Quote
Old Oct 22, 2010, 12:17 AM
HobbyKing
Paul Susbauer's Avatar
Hong Kong, Hong Kong Island, Hong Kong
Joined Apr 2001
4,507 Posts
Built the ailerons tonight, though still need to add the laminated tips. Those will be coming this weekend. I only got about an hour in tonight.

When I designed it, I made it so all the cross braces were cut at 90 degree angles, made it much easier on me when building, see photo 3.

In the 2nd photo you can see how the ribs start to thin down as you near the tip. The full scale airplane, though a constant chord wing, did this...and I tried to reproduce this on my model...badly.
Paul Susbauer is offline Find More Posts by Paul Susbauer
Site Sponsor
Reply With Quote
Old Oct 22, 2010, 02:06 AM
Registered User
Nimbin, Australia
Joined Jan 2009
58 Posts
my '53

thought you might be interested in my Hummingbird. From aeromodeller plans, July 87 issue, designed by Jim Fullarton. It is 1/8 scale or 44 inch span, originally for 1cc diesel free flight. I installed a mega 16/7/6 and it flies very nicely. I doped the thin balsa turtle deck and forgot to add some plasticiser, so it has that starved horse look.
An aircraft of great character. good luck with yours.
jugglingtony is offline Find More Posts by jugglingtony
Reply With Quote
Old Oct 22, 2010, 02:22 AM
Registered User
Nimbin, Australia
Joined Jan 2009
58 Posts
images for previous post

had a bit of trouble uploading these
jugglingtony is offline Find More Posts by jugglingtony
Reply With Quote
Old Oct 22, 2010, 07:39 AM
Registered User
Pat Daily's Avatar
United States, VA, Chesterfield
Joined Mar 2001
5,373 Posts
beautiful model and nice plane!
Pat Daily is offline Find More Posts by Pat Daily
Reply With Quote
Old Oct 22, 2010, 09:25 AM
Visitor from Reality
United States, VA, Arlington
Joined Dec 1996
12,788 Posts
Hi Paul
Good luck with your project. The DH-53 makes a great model. I designed and built one back in England, around 1990, 60" span or thereabouts for an OS26 fourbanger. Electric will be way better - make it easier to build that tiny flat twin into the nose.

My tailfeathers were mostly holes with light balsa laminated outlines - they are a long ways back and there's not much nose to balance them up front. Best I can recall, mine had most of the RC gear up front and had no issues nor need of ballast.

Fuselage was mostly 1/16" very light sheet balsa, with minimal structure inside, to replicate the prototype's ply sheeted fuselage. I didn't even cheat and leave the underside open framed.

Built her with two piece wings, wire joiners into tubes in wing panels and fuselage, with structural wing struts. Why not - you can't miss them, they'd weigh as much if they were just for looks, so make them do something useful.

Unfortunately, my photos of the model are somewhere in the old boxes of 35mm prints, but I replicated DH's circular aileron drives in the bottom of the wing with servo disc output arms. That allowed me to mechanically induce the massive aileron differential DH was prone to using.

Being of that nature back then, I also replicated the full size's rudder and elevator operation, with wires everywhere and the 'rudder bar' protruding out from the front fuselage sides.

Flew fine. With the narrow track gear, she demanded an into wind take off, though the wingtip skids did work as advertised once or twice... In the air, pretty docile - the huge tailplane on a long moment makes her easygoing in pitch and the vertical area is more than adequate for amiable handling.

Bragging here - but I hand-drew every wing rib. Managed to fudge one to do double duty, but that was it. The full size used a section based on RAF 15 - undercambered, with reflex at the rear, on the bottom, but varied to the familiar shapes on the topside of each section.

The LE sub-ribs were eyeballed!

Kept the plans for years, always intended to CAD them up but never did. Have a lot of info on the type, including two rolls of film worth of prints of OW's airworthy example. Once lent someone the negs to make their own prints off - guess the result, can't you?

Good luck, awaiting more on this fascinating model

Regards

Dereck
Dereck is offline Find More Posts by Dereck
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion de Havilland DH 53 Hummingbird DougB Scale Kit/Scratch Built 12 May 11, 2010 11:57 AM
Warbirdkit de Havilland DH-103 Hornet electric-flyer Scale Kit/Scratch Built 25 Oct 27, 2005 10:03 PM
New in Box De Havilland Dh-88 Comet marshall Aircraft - Electric - Airplanes (FS/W) 1 Mar 27, 2003 05:37 PM