Thread Tools
Feb 25, 2015, 04:28 AM
Tony Audsley Retired Locksmith
Lockey's Avatar
Thread OP
Build Log

Dollar Tree Foam ... EZ-Jets


A few guys have asked me to design a few EDF jets made from Dollar Tree foam board and make them cheap and easy to build, so I decided to design a few models using an interchangeable power pod (EDF, ESC and thrust tube)

I am calling them my "Foam Board EZ-Jets"

I borrowed the idea of the power pod from Chris at Foam Concept Jets, as he uses a similar setup ... thanks Chris and hope you don't mind me using your great idea … Chris uses a large foam cup for his Power pod, here is a video of his one
Building the thrust tube for your 70mm Foam Concept Jet. (14 min 15 sec)
also visit Chris's web site, he has some real neat models http://foamconceptjets.com/

In case you don’t want to or (like me can’t find the right foam cup, I will start the thread with a … “how to make the interchangeable power pod”

I used one of Hobby Kings cheap and cheerful EDF / ESC combos and found it a nice little combo for the price, but you can use any 64 or 70 mm EDF … https://www.hobbyking.com/hobbyking/s...dProduct=11165

Here is the Power Pod, its just a very simple tapered tube made of foam ... Patterns for this Power Pod will be included on each set of plans /patterns

Lockey


Plans are now available at: http://www.lockeysrcplans.com
Last edited by Lockey; Dec 04, 2016 at 06:58 AM.
Sign up now
to remove ads between posts
Feb 25, 2015, 04:37 AM
Tony Audsley Retired Locksmith
Lockey's Avatar
Thread OP
Here is my first attempt at the EZ-Jets ... this one is the Blackbird SR-72 concept jet

Ready for maiden, AUW before paint is 820 grams (29 ounces) with 2200 / 4s battery

I think next time I would leave the paper on the outside and remove it on the inside to save a little weight, on the wings I will leave both sides, I like the look of it

Lockey
Last edited by Lockey; Feb 25, 2015 at 04:44 AM.
Feb 25, 2015, 04:39 AM
Tony Audsley Retired Locksmith
Lockey's Avatar
Thread OP
I didn't want to start this thread until I had maidened the first model ... so here is the maiden

Didn't have much time today, but as the wind was quite low, I thought I would give her a quick maiden flight

It flew (no trim needed) straight from my underhand launch ... she flies great

Very pleased with my first foam board EZ-Jet

I think I might be a little nose heavy as I was about an inch further forward of my best calculated guess ... I think this maybe contributed to what happened right at the end on the video

Battery was as far back as I could get it, and don't have a smaller 4s battery, maybe I should move the EDF back a little on the plans ??

Plenty of power / thrust though from the cheapy EDF ... and it sounded quite nice too

Lockey

EZ SR72 Maiden (3 min 0 sec)
Feb 25, 2015, 05:20 AM
Tony Audsley Retired Locksmith
Lockey's Avatar
Thread OP
Anyway, here is the build log for the SR-72

Very easy and quick to build, I had it ready for fitting radio gear etc in an afternoon (about 4-5 hours)

Its the very first time I have used foam board, and I probably made a few mistakes, but I do quite like it for building ... a little different to Depron

I used hot glue for the entire build and I found that ... its not a good idea to use masking tape to hold parts together for gluing as it pulls some of the paper covering off the foam

Plans at bottom of page ... only request is, if you build it, post pics of your build and video of the maiden ... please enjoy ...

Plans are now available at: http://www.lockeysrcplans.com
Last edited by Lockey; Dec 04, 2016 at 06:57 AM.
Feb 25, 2015, 08:21 AM
Registered User
Man, you are just having too much fun!
Feb 25, 2015, 09:03 AM
Tony Audsley Retired Locksmith
Lockey's Avatar
Thread OP
Quote:
Originally Posted by nuteman
Man, you are just having too much fun!
Cheers Nuteman, you are so right mate ... and guess what ... I have another almost ready to go

Trouble is, I can't remember where I found this one or what its called, thought it might be another concept jet, but maybe its just someones imagination running wild

All I need to complete this one is ... a bit of foam board, a couple of servos and a receiver ... I already have the EDF and ESC

Lockey
Last edited by Lockey; Feb 25, 2015 at 09:08 AM.
Feb 25, 2015, 09:15 AM
When cows fly!

Great build !


Lockey,
Love the new plane. I like the look of the second drawings even more. Just built my first F-22 prop in slot pusher. Love the way it flies. Almost ready to make a move to an edf. Definitely watching this thread. Thanks for all of your great work!
Feb 25, 2015, 10:07 AM
Registered User
very cool.

thanks for the plans. This looks like one that my son would LOVE.

ive tried to get him into flying a bit here and there. he's still young, only 8. but flies great on the sim. 3channel, 4 channel, he does great. the F22 prop jet i just built really got him interested.
Feb 25, 2015, 03:26 PM
Registered User
Robert4613's Avatar
It's so amazing to see people with more talent in their little finger than I do in my whole body. Looks great! I'll have to check out the video of the maiden when I have some spare time.
Feb 25, 2015, 09:46 PM
Tony Audsley Retired Locksmith
Lockey's Avatar
Thread OP
I didn't move the EDF position back on the plans, so check your battery and EDF for balance before cutting out the slot in the wing for the EDF pod

I was also thinking, if anyone wants to go with a pusher and save weight (about 150 - 200 grams could be saved) it would be easy to remove the EDF pod and use a removable pusher pod ... I will try this and see what batter it needs to get it to balance OK

Lockey
Last edited by Lockey; Feb 25, 2015 at 09:53 PM.
Feb 26, 2015, 07:10 AM
Tony Audsley Retired Locksmith
Lockey's Avatar
Thread OP
Pusher power pod, balances OK with 2200 / 3s battery on where I estimate C of G should be

Weight with 2200 / 3s battery is 660 grams ... EDF wieght with 2200 / 4s battery is 820 grams

I have also modified the plans ... shortened the EDF pod by 25 mm and changed the position on the wing, this should help with balancing with the EDF setup ... also added the Pusher power pod

I will post the modified plans later when I have converted to PDF files

Lockey
Last edited by Lockey; Feb 26, 2015 at 07:42 AM.
Feb 26, 2015, 10:24 AM
Registered User
Lawn Dart Flyer's Avatar
I was never interested in a jet, until now
Feb 26, 2015, 11:49 AM
Gravity is my enemy
Balloon Bandit's Avatar
Aha! So this is what has distracted you from the StarTrek bird.. LOL, Great designs, keep up the good work Tony!
Feb 26, 2015, 02:24 PM
Gravity is my enemy
Balloon Bandit's Avatar
Are you leaving paper on those DTF jets?
Feb 26, 2015, 06:59 PM
Tony Audsley Retired Locksmith
Lockey's Avatar
Thread OP
Quote:
Originally Posted by Balloon Bandit
Aha! So this is what has distracted you from the StarTrek bird.. LOL, Great designs, keep up the good work Tony!
Whoops ... you found me Bandit I did get distracted by this one mate because it was so quick and easy to build

I did leave the paper on this one but its the first time I ever used foam board so I wasn't quite sure what to do

I think on the next one I will remove the inner paper to make it a bit lighter, ... now I have found out how EASY it is to remove the paper ... but leave the outer on for strength

These models are designed to be cheap, quick and easy to make (but still have a bit of shape and style rather than just a profile model) and chuck away when it gets too banged up ... after all, we do live in a chuck away society eh

I will throw a bit of paint on it later ... never was big on painting though

Lockey
Last edited by Lockey; Feb 26, 2015 at 07:50 PM.
Feb 26, 2015, 07:03 PM
Tony Audsley Retired Locksmith
Lockey's Avatar
Thread OP
Would you guys rather I did a PDF (printable) instructions for these models or a build video ?

They will all be the same (or very similar) type of construction and all use the same power systems and equipment

The "EZ-Stealth" is almost ready to build

Need to find a better / easier way to fit / unfit the PUSHER power pod ... any ideas guys ?? ... the way I have done it works but probably not the best

Lockey

PS. By the way bandit ... how about fill in your profile so we can all see where you are in the world
Last edited by Lockey; Feb 26, 2015 at 07:46 PM.
Feb 26, 2015, 08:33 PM
Registered User
Hi Tony I like to remove all paper on dtb ,paper will come of when wet. Paper is not on foam very tight, paper is heavy.
Feb 26, 2015, 08:42 PM
Tony Audsley Retired Locksmith
Lockey's Avatar
Thread OP
Quote:
Originally Posted by leejohn
Hi Tony I like to remove all paper on dtb ,paper will come of when wet. Paper is not on foam very tight, paper is heavy.
Hey Leejohn, I found it was quite difficult to remove the paper, until I saw the video and I found that a spray with Methylated Spirits and it simply peels off clean

Water tends to make the paper go all mushy

By the way Leejohn .. how about fill in your profile so we can all see where you are in the world

I like to know where you guys are situated in the world

Lockey
Feb 26, 2015, 08:52 PM
Tony Audsley Retired Locksmith
Lockey's Avatar
Thread OP
The FS-2020 flies so well, I think I might also do this one as a EZ-Jet

Lockey

FS 2020 with added tail fins (2 min 9 sec)
Feb 26, 2015, 09:44 PM
skumgummi dave
Quote:
Originally Posted by Lockey
Pusher power pod, balances OK with 2200 / 3s battery on where I estimate C of G should be

Weight with 2200 / 3s battery is 660 grams ... EDF wieght with 2200 / 4s battery is 820 grams

I have also modified the plans ... shortened the EDF pod by 25 mm and changed the position on the wing, this should help with balancing with the EDF setup ... also added the Pusher power pod

I will post the modified plans later when I have converted to PDF files

Lockey
Wowser Tony, you must have read my mind. I really like this idea as I think it will make for a more lively flier. Kudos!

Dave-
Feb 26, 2015, 09:46 PM
Tony Audsley Retired Locksmith
Lockey's Avatar
Thread OP
I have modified the plans / patterns and posted on post #4 marked there as MK2

These have the shorter EDF power pod to enable the EDF to be moved further back to aid with balancing, I have changed the position of the pod on the wing and I have also added the pusher power pod on the plans too ... most everything else stays the same

I will be using this shorter EDF power pod on all future EZ-Jet models

Please let me know ... Would you guys rather I did a PDF (printable) instructions for these models or a build video ... AND, do you think I should put ALL the EZ-Jet models on this thread or make a new thread for each different model ?

Lockey

PS, you posted while I was posting Dave ... glad you like it mate and I am sure a few guys will like the cheaper option too
Last edited by Lockey; Feb 26, 2015 at 09:51 PM.
Feb 26, 2015, 10:00 PM
Registered User
Lawn Dart Flyer's Avatar
Love both those jets. I have been building with Dollar Tree foam board for about 3 years now and I would like to clear a few misconceptions about it. 1 sheet is about 100 grams. The paper is NOT glued on, it is bonded during the making process with heat. Getting it wet can make the paper wrinkle and peel, simple fix is use an hot iron to rebond. Removing all the paper is removing structural strength, which some people make up for that by using spars (are we adding weight we just took off?) DTFB can be painted with spray paint, especially the new krylon hot shots which is totally foam safe, as is floral spray paint. Using your covering iron to make your bevels and for rounding out straight edges is form and function, it gives the edge a finished look and help keep the paper from peeling. I have a few DTFB planes at least 3 years old and still flying great.
Feb 26, 2015, 11:42 PM
Tony Audsley Retired Locksmith
Lockey's Avatar
Thread OP
Thanks for the info Lawn Dart Flyer, very much appreciated

We can't buy it real cheap like you guys can, but I found these people and bought 5 sheets at $14.50 a sheet but they are BIG ... 1525 x 1015 mm (60 inches x 40 inches) and they have some great tools too but not cheap http://www.foamboards.com.au/store/store_tools I have ordered a couple of the tools though

Lockey
Last edited by Lockey; Feb 26, 2015 at 11:49 PM.
Feb 27, 2015, 06:12 AM
Tony Audsley Retired Locksmith
Lockey's Avatar
Thread OP
Ready for the maiden with pusher prop, it will be interesting to see what (if any) difference the lighter weight will make .. It will no doubt be a longer flight time

2 minute job to change from EDF to pusher ... I LIKE IT

Gave her a coat of black on the top only underside still white

Lockey
Feb 27, 2015, 07:46 AM
Registered User
Lawn Dart Flyer's Avatar
That's fast work, a testament to good designing. I can't be quite sure but this might be the first prop to edf swapable
Feb 27, 2015, 08:10 AM
Registered User
Lawn Dart Flyer's Avatar
Lockey, may I have your permission to post this link on flite test forums?
Feb 27, 2015, 09:11 AM
Registered User
Robert4613's Avatar
Lockey, you can use isopropyl alcohol to easily remove the paper from the DTF foam board. It dries fast too. I had learned this trick online and had made a quick video using it. Both the 50% alcohol and the spray bottle were for a buck each at the Dollar Tree. Since the spray head fit on the rubbing alcohol I trimmed down the pickup tube and attached it to the bottle.

Removing the paper from Dollar Tree Foam. (0 min 44 sec)
Feb 27, 2015, 09:26 AM
Registered User
Great work Lockey!!!
Feb 27, 2015, 10:03 AM
Tony Audsley Retired Locksmith
Lockey's Avatar
Thread OP
Quote:
Originally Posted by Lawn Dart Flyer
Lockey, may I have your permission to post this link on flite test forums?
Go for it mate, post the link when you do, I would like to see the comments

Lockey
Last edited by Lockey; Feb 27, 2015 at 10:14 AM.
Feb 27, 2015, 10:09 AM
Tony Audsley Retired Locksmith
Lockey's Avatar
Thread OP
Quote:
Originally Posted by Robert4613
Lockey, you can use isopropyl alcohol to easily remove the paper from the DTF foam board. It dries fast too. I had learned this trick online and had made a quick video using it. Both the 50% alcohol and the spray bottle were for a buck each at the Dollar Tree. Since the spray head fit on the rubbing alcohol I trimmed down the pickup tube and attached it to the bottle.

https://www.youtube.com/watch?v=J0AqCxd4ty0
Isopropol is very expensive in Australia, over $8.00 for only 125 ml

Methylated Spirits on the other hand is very cheap at $3.30 for 1lt and it does exactly the same job ... spray it on the paper, leave a few seconds and peel off the paper

Quote:
Great work Lockey!!!
Thanks Scott, very much appreciated

Lockey
Last edited by Lockey; Feb 27, 2015 at 10:16 AM.


Quick Reply
Message:

Thread Tools