Simple Foamboard and Printed 50mm EDF - RCCanada - Canada Radio Controlled Hobby Forum
RCCanada - Canada's Radio Control Hobby Forum
Electric Jets Discuss electric jets in Canada.

Reply
 
Thread Tools Display Modes
Old 05-25-2020, 10:10 PM   #1
Cat 1
Level 3 Supporter
★ Site Supporter ★
 
Cat 1's Avatar
 
I am: Chris S.
Join Date: Feb 2004
Location: Prince Albert, Sask
Radio of choice:
Graupner MZ-24 PRO
# of RCs: 25

Feedback: 51 / 100%
Posts: 464
Total Props: 4
Simple Foamboard and Printed 50mm EDF


       Remove this ad - become a site supporter!
Hello All,

I have decided to do a little build log and document a project I'm working on. In another thread under the Electric Jets Heading the Awesome designer and builder John Dutkoski is planning a project for a 90mm EDF based loosely on the Reaction 54 turbine designed by Bruce Tharp. I was watching with interest as I want to brew up a simple 90mm EDF. In his development efforts he built a 1/2 size test glider and commented how well it would be suited as a 50mm airframe.

the original thread is here -
https://www.rccanada.ca/rccforum/sho...d.php?t=592371

We had a bit of a back and forth about intakes and I offered that a 3d printed intake might work well in this design. I have been playing with replacing some of the traditional balsa or composite parts in more conventional builds with printed parts and had some good success. I wanted to print a demo for John and drew a 90mm size example but printed it at 50mm size for time considerations - as soon as I saw the duct I knew this might have the makings of a good simple 50mm EDF. I think John also plans to build a 50mm version of his design which will be interesting to compare.

I have had some good success with the "dollar tree" foam board type planes so I thought I should try and incorporate this duct design and the simple cut and fold foam construction.

I always have the best intentions of documenting my builds and designs but never seem to get around to it. Will try and keep this one on track and document right through to seeing if this beast is viable.. lets GO!!!
Cat 1 is offline   Quick reply to this message.

Sponsored Links - Subscribe to remove this ad.
Old 05-25-2020, 10:18 PM   #2
Cat 1
Level 3 Supporter
★ Site Supporter ★
 
Cat 1's Avatar
 
I am: Chris S.
Join Date: Feb 2004
Location: Prince Albert, Sask
Radio of choice:
Graupner MZ-24 PRO
# of RCs: 25

Feedback: 51 / 100%
Posts: 464
Total Props: 4
Re: Simple Foamboard and Printed 50mm EDF

The Design:

as stated - the design is loosely based on the BTE reaction 54 turbine - this version is loosely based on John's version of his adaption for EDF. It has been dubbed the "Action 50" as for every reaction there must be an equal and opposite "Action"

A three view was drawn up in CAD based on the original 3 views of the 54. I had to squeeze the sizes a bit to make the parts fit on 20"X30" boards. The plans were manipulated to fit the parts on 2 sheets of foam.. It will use a simple airfoil design used by many FB airframes.
Attached Thumbnails
Click image for larger version

Name:	action 50.jpg
Views:	61
Size:	159.1 KB
ID:	1675187  
Cat 1 is offline   Quick reply to this message.
Old 05-25-2020, 10:37 PM   #3
Cat 1
Level 3 Supporter
★ Site Supporter ★
 
Cat 1's Avatar
 
I am: Chris S.
Join Date: Feb 2004
Location: Prince Albert, Sask
Radio of choice:
Graupner MZ-24 PRO
# of RCs: 25

Feedback: 51 / 100%
Posts: 464
Total Props: 4
Re: Simple Foamboard and Printed 50mm EDF

The Power Egg:

Here is the unit that drove the design. The intake is a CAD lofted intake with good numbers - Inlet is +100% FSA at 50mm and transitions smoothly to eliminate the spinner area at the fan inlet. A Powerfun 50MM 11 blade unit is packed in the middle and actually held in place by two ducts. The tailpipe is tapered down to 100% FSA at a 44mm exit.

The inlets have flanges on the sides which are located to be glued to the inside of the Box fuselage. The tailpipe has a "former" incorporated in the front that will match the inside of the fuse. The inlet will simply extend through cutouts in the side of the fuse "Box".

The duct has "flat" inlet edges for simple printing but these will be faired with printed "lips" once installed.
Attached Thumbnails
Click image for larger version

Name:	action 50 duct.png
Views:	41
Size:	42.7 KB
ID:	1675191   Click image for larger version

Name:	IMG_5615.jpg
Views:	50
Size:	619.0 KB
ID:	1675193   Click image for larger version

Name:	IMG_5634.jpg
Views:	40
Size:	35.7 KB
ID:	1675199   Click image for larger version

Name:	IMG_5624.jpg
Views:	44
Size:	824.7 KB
ID:	1675201  

Click image for larger version

Name:	IMG_5630.jpg
Views:	41
Size:	75.3 KB
ID:	1675205   Click image for larger version

Name:	IMG_5633.jpg
Views:	44
Size:	63.9 KB
ID:	1675207  
Cat 1 is offline   Quick reply to this message.
 
Old 05-25-2020, 10:44 PM   #4
Cat 1
Level 3 Supporter
★ Site Supporter ★
 
Cat 1's Avatar
 
I am: Chris S.
Join Date: Feb 2004
Location: Prince Albert, Sask
Radio of choice:
Graupner MZ-24 PRO
# of RCs: 25

Feedback: 51 / 100%
Posts: 464
Total Props: 4
Re: Simple Foamboard and Printed 50mm EDF

Cut some foam!

Foam has been cut and all parts seem to fit well - I do cheat a bit with this because I go right from my CAD and cut on a CNC router I made - I have done enough that I think its almost faster than printing the drawing and cutting manually.

Very simple techniques are employed - anyone who has ever built a Flite test bird will find this easy. I will use a couple of "trick" printed parts to take care of the "pointy end" and the "hatch latch"

Here is the foam - Last post for the night but Assembly soon... stay tuned...

Chris
Attached Thumbnails
Click image for larger version

Name:	IMG_5625.jpg
Views:	64
Size:	88.3 KB
ID:	1675217  

Last edited by Cat 1; 05-26-2020 at 06:30 AM.
Cat 1 is offline   Quick reply to this message.
Old 05-25-2020, 11:01 PM   #5
Max
Administrator
★ Site Supporter ★★ Administrator ★
 
Max's Avatar
 
I am: Max P.
Join Date: Feb 2007
Location: Aurora, Ontario
Radio of choice:
JR and Spektrum

Feedback: 57 / 100%
Posts: 17,764
Total Props: 185
Re: Simple Foamboard and Printed 50mm EDF

This is going to be a great thread, I can tell. With the advent of 3D printing technology, I am looking forward to the paradigm shifts that will lead to simpler and faster home-made RC aircraft!!
__________________
RC Test Pilot; FPV Instructor, Airplane Instructor; Helicopter Instructor

My Aircraft Albums: https://www.rccanada.ca/rccforum/album.php?u=13173

Last Photo added: Dec 15; Warwing Foamy for FPV
Max is offline   Quick reply to this message.
Old 05-26-2020, 09:54 PM   #6
Cat 1
Level 3 Supporter
★ Site Supporter ★
 
Cat 1's Avatar
 
I am: Chris S.
Join Date: Feb 2004
Location: Prince Albert, Sask
Radio of choice:
Graupner MZ-24 PRO
# of RCs: 25

Feedback: 51 / 100%
Posts: 464
Total Props: 4
Re: Simple Foamboard and Printed 50mm EDF

Make a Fuse:

The fuse is a convention simple foam board U channel/Box using conventional FB techniques.

A good plan and quick execution are required to get all the hot glue applied in the right spots to glue the main structure together but in about 10 minutes you have a complete EDF fuse including tail feathers.

Lots of room for a 3s 2200 - planning on a 1500 to 2200 mAH pack.

a couple of tricks:

a 3d printed template was produced from the drawing to cut and taper the duct openings in the sides - It allowed for a good fit for the inlet ducts.

The canopy was marked out and cut after assembly and will get a little printed latch system I'm working on.

The leading edge of the fin got some printed "molding" I make to toughen up the leading edge of the foam board surfaces - the Horizontal stab might get some too.

A little grey vinyl on the canopy and we sort of have a jet....

Chris
Attached Thumbnails
Click image for larger version

Name:	IMG_5631.jpg
Views:	48
Size:	90.0 KB
ID:	1675307   Click image for larger version

Name:	IMG_5635.jpg
Views:	47
Size:	88.5 KB
ID:	1675309   Click image for larger version

Name:	IMG_5636.jpg
Views:	46
Size:	89.4 KB
ID:	1675311   Click image for larger version

Name:	IMG_5639.jpg
Views:	45
Size:	77.2 KB
ID:	1675313  

Click image for larger version

Name:	IMG_5640.jpg
Views:	47
Size:	63.9 KB
ID:	1675315   Click image for larger version

Name:	IMG_5641.jpg
Views:	47
Size:	74.2 KB
ID:	1675317   Click image for larger version

Name:	IMG_5642.jpg
Views:	50
Size:	78.5 KB
ID:	1675319   Click image for larger version

Name:	IMG_5645.jpg
Views:	47
Size:	84.1 KB
ID:	1675321  

Click image for larger version

Name:	IMG_5637.jpg
Views:	45
Size:	53.2 KB
ID:	1675323   Click image for larger version

Name:	IMG_5638.jpg
Views:	42
Size:	58.9 KB
ID:	1675325  
Cat 1 is offline   Quick reply to this message.
Old 05-27-2020, 08:48 PM   #7
Cat 1
Level 3 Supporter
★ Site Supporter ★
 
Cat 1's Avatar
 
I am: Chris S.
Join Date: Feb 2004
Location: Prince Albert, Sask
Radio of choice:
Graupner MZ-24 PRO
# of RCs: 25

Feedback: 51 / 100%
Posts: 464
Total Props: 4
Re: Simple Foamboard and Printed 50mm EDF

Wing construction:

The wing is again typical foam board construction - a bit of 1/8" balsa was added to the 2 ply spar for a bit of extra rigidity and strength. A good flat build surface insures a straight wing.

The fuse is notched to clear the spar and test fitted - the wing is not glued yet as all of the radio and electronics are routed through the centre section over the wing so access is needed here. But we will put it together to see how it looks.

Not much to write about here as it was a very simple and quick step.

Chris
Attached Thumbnails
Click image for larger version

Name:	IMG_5651.jpg
Views:	45
Size:	52.0 KB
ID:	1675465   Click image for larger version

Name:	IMG_5652.jpg
Views:	44
Size:	89.2 KB
ID:	1675467   Click image for larger version

Name:	IMG_5653.jpg
Views:	42
Size:	81.3 KB
ID:	1675469   Click image for larger version

Name:	IMG_5655.jpg
Views:	47
Size:	69.3 KB
ID:	1675471  

Click image for larger version

Name:	IMG_5656.jpg
Views:	49
Size:	82.2 KB
ID:	1675473   Click image for larger version

Name:	IMG_5657.jpg
Views:	52
Size:	77.6 KB
ID:	1675475  
Cat 1 is offline   Quick reply to this message.
Old 05-28-2020, 06:23 AM   #8
Dutkoski
RCC Pro Contributor
 
Dutkoski's Avatar
 
I am: John Dutkoski
Join Date: Dec 2002
Location: Toronto, Ontario
Radio of choice:
Spectrum
# of RCs: 10+

Feedback: 3 / 100%
Posts: 1,888
Total Props: 9
Re: Simple Foamboard and Printed 50mm EDF

I'm envious Chris, being able to CNC cut partsvand 3D print parts has eluded me. So far, my efforts for assistance to get my 3D printer working has planned out.

One thing I've discovered from watching lots of the FliteTest Test videos is the tricks of forming the foam. If you peel the paper off one side of the foam board, it bends very smoothly. Great for bending the front of the fuselage together. Plus, you get a weight savings have half the paper gone. When doing an airfoil them the foam really contours nicely, you don't get that step at the front. Plus, that's a lot of paper being removed, so substantial weight saving.

For the size of the model, I would start with a battery in the 1500 to 1800 MAH size, unless you can get a fairly light 2200. For my foam version of the Arrow, I run twin 50 mm EDF's and use 4 cell 2200 setups to get the max power, but this model has lots of wing area and can literallly float in for a landing. I have lots of small batteries, abet, old, but will be using one of those.

I might be using a Change Sun EDF on a three cell or go for broke and use one of the RC Lander EDF's on a 4 cell 2200, they produce 420 watts of power.
Dutkoski is offline   Quick reply to this message.
Old 05-28-2020, 01:48 PM   #9
Cat 1
Level 3 Supporter
★ Site Supporter ★
 
Cat 1's Avatar
 
I am: Chris S.
Join Date: Feb 2004
Location: Prince Albert, Sask
Radio of choice:
Graupner MZ-24 PRO
# of RCs: 25

Feedback: 51 / 100%
Posts: 464
Total Props: 4
Re: Simple Foamboard and Printed 50mm EDF

Good tips on the removal of the paper John. I usually rout more lines on the "airfoil" to make smoother but didn't in this case as I thought the thickness wouldn't require it but I do see some stepping. That said - one of the sweetest flying FT planes I ever flew was a FT Racer built by a fellow modeler here. It had the 3 step "triangle" airfoil and flew amazingly well.

I think this fan pulls just under 300 watts on a 3 cell but I think it will be throttled back quite a bit in normal flight. Weight estimate is looking like 18-20 oz. I will plan to try a smaller battery as you suggest for the initial flights but would be nice to throw a light 2200 in for "cruising". A lot will depend on what the balance looks like when done.

Chris
Cat 1 is offline   Quick reply to this message.
Old 05-28-2020, 09:45 PM   #10
Max
Administrator
★ Site Supporter ★★ Administrator ★
 
Max's Avatar
 
I am: Max P.
Join Date: Feb 2007
Location: Aurora, Ontario
Radio of choice:
JR and Spektrum

Feedback: 57 / 100%
Posts: 17,764
Total Props: 185
Re: Simple Foamboard and Printed 50mm EDF

Hey guys, I just came across this. Using 3D printed parts to make a mould for making carbon parts. Thinner, stronger and lighter. Hmmm...
https://3d.formlabs.com/webinar-how-...mposite-parts/
__________________
RC Test Pilot; FPV Instructor, Airplane Instructor; Helicopter Instructor

My Aircraft Albums: https://www.rccanada.ca/rccforum/album.php?u=13173

Last Photo added: Dec 15; Warwing Foamy for FPV
Max is offline   Quick reply to this message.
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the RCCanada - Canada Radio Controlled Hobby Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

Member names may only be composed of alpha-numeric characters. (A-Z and 0-9)

!!ATTENTION ADVERTISERS!! If you intend on advertising anything on this forum, whatsoever, you are required to first contact us here . Additionally, we do NOT allow BUSINESS NAMES unless you are an Authorized Vendor. If you own a business, and want to do sales on this site via posting or private message, you will need to follow the rules. Shops, Stores, Distributors, Group Buys without being authorized will see your account terminated.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Radio of choice?
Which radio is your current favorite to use?
Number of RC Vehicles?
How many boats, cars, planes do you own?

Log-in



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
vBulletin Message

Thread Tools
Display Modes

Forum Jump


All times are GMT -5. The time now is 11:09 AM.


vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.