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3D printed PeeWee .020 tank backplate Babe_b10
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Cox Engine of The Month
November-2019
jmcalata's

"Pee Wee .020 throttled combinated"



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3D printed PeeWee .020 tank backplate

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Post  Jason_WI on Mon Sep 30, 2019 6:33 pm

Had some time this weekend and drew up the PeeWee .020 tank backplate. This utilizes the spraybar and needle valve from a babe bee plastic backplate. I had one that was broken and extracted the spraybar from it.

It is thicker to support the larger spraybar. I also angled the tank fill port for easier access. Small vent hole on the other side of the needle valve for filling.  

It needs a few changes. I need to increase the size of the fuel tube nipple inside the backplate. I suspect air leaks there as the fit is loose. I also need to reduce the diameter of the spraybar hole for a better pressfit and sealing. The first plate I drilled too big and fuel escaped past the spraybar and the engine ran with the needle valve all the way closed. The only issue was I had to retighten the backplate screws after a few runs. The heat and vibration probably settled in the backplate. More run time needed.

The good think is the tank didn’t leak where it meets up with the backplate.

Probably not too hard to find a couple of beta testers. Smile  

Other features that could be added are using an extended fuel inlet top and bottom to make a stunt PeeWee tank backplate. Also can extend the side wall to use black widow screws and make an extended run tank.

Here are a few pictures and a run video.



3D printed PeeWee .020 tank backplate Cf7d1910
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3D printed PeeWee .020 tank backplate 393af610
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3D printed PeeWee .020 tank backplate 3bdee910
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Post  batjac on Mon Sep 30, 2019 9:23 pm

Looks good.  Will be  good solution for all those broken off mounting tabs on PeeWees.  But something you said gives me an idea.  I know you're busy with new things, but how about a printed tank extender for the PeeWees like the Kavan tank extender for the Bee engines?

The Pondersome Mark
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Post  Admin on Mon Sep 30, 2019 9:52 pm

It lives! Thumbs Up

batjac wrote:but how about a printed tank extender for the PeeWees like the Kavan tank extender for the Bee engines?

LOL, I thought the same thing. This backplate is like a much improved version of the Kavan tank extender (I don't believe they even made a .020 extender). Could make the backplate as deep as screws are available. Extending runtime.

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Post  Marleysky on Tue Oct 01, 2019 6:44 am

You guys! Jason was all ready thinking of that!!  Re read his last comment:

“Probably not too hard to find a couple of beta testers. Smile  

Other features that could be added are using an extended fuel inlet top and bottom to make a stunt PeeWee tank backplate. Also can extend the side wall to use black widow screws and make an extended run tank.

Here are a few pictures and a run video. “

Oh yeah......I volunteer to be a Beta testors!! lol!
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Post  Jason_WI on Tue Oct 01, 2019 6:00 pm

Here are the extended run and stunt versions of the tank backplates. Print these out tonight and give them a run tomorrow.

Not sure if a stunt peewee would be useful but now its an option.

3D printed PeeWee .020 tank backplate Extend10
3D printed PeeWee .020 tank backplate Peewee10
3D printed PeeWee .020 tank backplate Stunt_10


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Post  dckrsn on Tue Oct 01, 2019 6:19 pm

Pinch me! Shocked Shocked Shocked Shocked Shocked Shocked Shocked Shocked Shocked
Bob
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Post  Jason_WI on Tue Oct 01, 2019 6:42 pm

Extended run stunt version. It's not a dream.

3D printed PeeWee .020 tank backplate Extend11

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Post  dckrsn on Tue Oct 01, 2019 7:10 pm

Now if it would just rain .020 pistons and cylinders.
Oops, still dreaming. This is great, Jason. Can't wait.
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Post  batjac on Tue Oct 01, 2019 9:26 pm

Jason_WI wrote:Not sure if a stunt peewee would be useful but now its an option.

If you're going to stunt a PeeWee, it's gotta have an extended tank. Who wants to stunt for only two minutes? And if you're going to run an extended PeeWee, no sense getting bored going roundy-roundy for six minutes.

The Greedy Mark
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Post  Jason_WI on Wed Oct 02, 2019 12:57 am

I bought some of these small barb fittings as I’m not sure how reliable the printed one will be inside the backplate. Also have some 3-56 bottom taps on the way.

https://www.clippard.com/part/11750-2-PKG

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Post  Jason_WI on Wed Oct 02, 2019 3:00 am

Ding...Fries are done!

I need  sleep

3D printed PeeWee .020 tank backplate Cea53110

Had to get a pic with the extended stunt backplate installed.

Behold. The PeeWee .020 “Super Tanker”

3D printed PeeWee .020 tank backplate Db8b2710
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Post  Marleysky on Wed Oct 02, 2019 8:47 am

SuperTanker! Love it! lol!
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Post  getback on Wed Oct 02, 2019 10:31 am

Very Nice Jason !! that is one long (looking tank) !! How much does she weight ? Small Cox Logo
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Post  xplaneguy on Thu Oct 03, 2019 11:11 am

Awesome work, Jason! Count me in. Wink
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Post  Jason_WI on Thu Oct 03, 2019 5:49 pm

So I ran the super tanker pee wee last night. I didn't get a chance to get a video as I was constantly messing with the needle valve.

With the long tank and engine vibrations I'm thinking the fuel was foaming inside the tank. It would run great for 10 seconds then lean out. I would open the needle till it ran rich then close it up and it would run great for 10 seconds then repeat the cycle. I can thicken the side wall on the inside, add cross supports inside the tank area, or shorten to use babe bee screws vs the stunt tank screws that are 1" long.

My .25 mm hardened tool steel nozzle is worn out from the abrasive carbon fiber filament. I have new ones coming tomorrow and can resume printing tanks with the changes mentioned above.

I'm already using a nickle plated hardened tool steel nozzle but after all the horseshoe back plates I printed its worn out to the point where the print quality is poor.

Nozzle I'm using now:

https://e3d-online.com/nozzlex-v6

Might have to go to a ruby nozzle instead but they are pricey.

https://olssonruby.com/the-olsson-ruby/#high-temp
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Post  Ada99 on Fri Oct 04, 2019 11:24 am

What filament material do you use for these parts?

Many Thanks,
=Adrian=
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Post  Jason_WI on Fri Oct 04, 2019 1:09 pm

DuPont carbon fiber reinforced Zytel.

https://coexllc.com/product/3d-filaments/dupont-filament/zytel-carbon/zytel-3d10c20fl-bk544-1-75mm

In addition to zytel I’m going to try this with POM (delrin) which is what the original .049 horseshoe backplates were made of. The issue with delrin is getting it to stick to the build plate.
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Post  Jason_WI on Fri Oct 04, 2019 11:08 pm

Here are the brass fuel inlet nipples I bought to use instead of the fragile printed one on the inside of the tank.

Uses a 3-56 thread. Bottom tap hasn’t arrived yet from Amazon.

I’m going to have to beef up the back where the screws enter as I have cracked a few of them tightening the screws. I’m thinking of using babe bee screws and making the back  solid instead of having the open voids where the screws are. With the slightly longer screws I can lengthen the tank area to still give more run time than a standard PeeWee tank.

3D printed PeeWee .020 tank backplate 643d1110
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Post  getback on Sat Oct 05, 2019 9:44 am

That sounds like a plan Jason , and that ruby tip looks really nice and so is the price lol . I would bee interested in 10 of the horse shoe back plate mounts if you would like to perform that task ? if so PM me a price / and for rules here i will bee selling some on the bay with some engines i have Very Happy
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Post  Jason_WI on Sun Oct 06, 2019 12:58 am

New design on the left. Thicker mounting lugs, thicker back, brass fuel inlet, and it uses the current babe bee screws available. Volume of the tank should be greater and will have improved strength. Will try to print one in delrin.

3D printed PeeWee .020 tank backplate Update12
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Post  NEW222 on Sun Oct 06, 2019 11:01 am

Wow. Just simply amazing work.
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Post  Jason_WI on Sat Oct 12, 2019 11:56 am

Here is one printed. Hopefully this works as the back is much thicker than before.

3D printed PeeWee .020 tank backplate C3982110
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3D printed PeeWee .020 tank backplate 794cdf10
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Post  Jason_WI on Tue Oct 22, 2019 2:17 am

Still no luck getting these to run consistently. I took a tank with a hole drilled in it and filed the side out to see what was going on inside. Looks like I have a good seal. I even tried two venturi seals. Same result. Engine never comes up to speed and needle setting has little effect which would point to it leaking in the tank.

I will add a few thousands to the backplate venturi tube to add a bit more squish to the venturi seal and increase the diameter 10 to 15 thousands. This way there will be margin for a nice flat area before it meets the edge.

3D printed PeeWee .020 tank backplate 36c10b10
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Post  Oldenginerod on Tue Oct 22, 2019 5:49 am

The print quality of your black unit looks as if it could be porous, maybe allowing air to be drawn through the material. Your white test unit certainly looks smoother in the finish.
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Post  fredvon4 on Tue Oct 22, 2019 8:28 am

OER beat me too my question...porosity of final part?

need some fixture to above atmosphere under water and look for bubbles
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