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Electric Ducted Fan Jets Discuss electric ducted fan jets here including setup tips, power systems, flying techniques, etc.

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Old 07-06-2014, 04:31 PM   #151
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Default Increased Inboard Nacelle



Javier cut another inboard nacelle for me. I felt it could stand a wee bit of room to permit a switch to Hexcel's
Honeycomb sheets from lite ply. A huge reduction of my design's all-up-weight. It grew in vertical size by .70 ".
None of this has had a persceptual effect on the static judges score.

Why?, This resulted in a proper 85% of our Dynamax fsa to assure we have a minimum of 19# thrust from each.
Though our outboard 90mm were not crowded, I thought they too needed to be increased for sake of servicing
and optimum 85% of fsa. From a service perspective...available space for outboard batteries was increased by
25%.

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Old 07-07-2014, 11:54 PM   #152
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Default Inboard Nac Enlargement

Javier sent new nacelle enlargement by USPS so I should have it in tomorrow's delivery. I fear it is too greatly
disproportional than we thought. If not, then we will immediately start milling Styrofoam Hi-Load 60.

I was in the midst of resizing our fuselage front end to accommodate changes I made which will yield close to
a 5 pound reduction in all up weight. Will explain and show results of this change after this nacelle arrives.



Ah, yes...they're big'ns...to quote Al Bundy!

85% FSA = 12.856 Sq.Inches


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Old 07-23-2014, 03:21 PM   #153
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The second mill test was 100% to spec! We will make a delivery of our Hi-Load 40/60 soon.
Javier experienced a notebook crash Saturday and will be down for this week. Exhaust is 85%
of FSA, optimum for the Dynamax.

I'm moving on to another test, plasticizer instead of .6 glass w/Z-poxy laminating resin. Wow-
Planes Liquid Sheeting CR replacing glass & resin, and in some cases even replacing balsa
sheeting.

I will return later and post Pix or video of tests as they emerge with answers for:

How smooth is each application to reach 16th thickness?
How thick to be "x" hard surfaced = Before 16th?
How thick to provide par T & C to glass/resin?

This will take two to three days to cure before results are known.

Anyone with experience applying and finishing WowPlanes polymer...sheeted, unsheeted, glassed,
unglassed?

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Old 07-23-2014, 04:27 PM   #154
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That's going to be the actual size of the nacelles? Wow! Just wow!!!

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Old 07-23-2014, 04:51 PM   #155
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Default Final Dims Adjustments

Ahh....a new thread follower

Welcome onboard! Anyone finding themselves behind the curve in this multiple-threaded
project will appreciate my posting our project dims index. I failed to realize in this section
of the thread I had not posted the dims for the two B-47's. These are actual sizes unless
I note otherwise.


Dims are subject to change given the necessity to change the entire size due to an evolving acccumulative error until
original 1/100th and 1/48th resources manifest themselves in CAD drawings. Model is scaled to maximum physical size
the EDF Dynamax conversion by Tamjets bifurcated within the inboard nacelles, yielding 19# static thrust.

Sum of each nacelle's two exhausts is 85% of the Dynamax FSA. This, as in the beginning, determined final size of this
project. As I audited each element work-up I adjusted to follow Sam's and Richard's physical measurements of the 1:1
measured during their six measurement sessions of B-47 survivors across the US from Savanah, GA to Tempe, AZ. You
must understand each of these survivors were assembled from parts and components from multiple type airframes.


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Old 07-24-2014, 03:40 PM   #156
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Default

Will try to get settled down again to do the liquid skin testing with our smaller inboard nac.
We got back too late to get anything done yesterday.

I hoped there was a contribution by a Wowplanes customer waiting to be read today, but
no it's another non-feedback day Meanwhile back to the far side...

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Old 07-25-2014, 02:11 AM   #157
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Default

Was hoping somebody who has experience using the stuff would speak up!!!

Take care and thanks for posting at WattFlyer!!

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Old 07-25-2014, 03:18 AM   #158
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Default

I have 12 adjacent edges and multiple compound curves with which to experience
Wowplanes Liquid Sheeting.

I am most interested in destructively determining how durable the surface and edges
are. Might as well make best use of the too small inboard nacelle. I just heard a moan


Oh, don't forget my two exhaust outlets with their hot wired feather edges. This alone
will disclose how strong the liquid sheeting is on virtually its own.

Will lightly sand the exterior surfaces before applying liquid.

We didn't get back here until 8 tonight so aside from preparing an area on the dining
room table, that's all that gets done tonight.

Can I post video without having to post on YouTube?

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Old 07-26-2014, 05:49 PM   #159
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Default

Gee, why is it I am left to discover answers about this site's video limitations?
Would have thought all the YouTubers would have chimed in by now..

Its Saturday morning so we are off to Home Depot to pick up 1 and 2 inch foam
brushes and disposable mixing cups. Suppose I will have to call around for glass
beeker rods. Its amazing what used to be over the counter in drug stores is no
longer availble.

Wowplanes was explicit in telling me to throw away every mixing cup, or as some
here will appreciate the statement written to only use mixing cups one time then
throw them away.

DO NOT TRY TO CLEAN THEM OFF AND REUSE.... If you were to do this you will
contaminate the next batch of Liquid Sheeting. Each batch has to be with virgin,
unused mixing cups and foam brushes.

I will clean up my glass mixing rods, aka glass bar set stiring rods...with water and
alcohol to remove all chemicals from previous use...each and every time I use them.

Still not believing no one posted their experience with Wowplanes Liquid Sheeting...

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Old 08-16-2014, 12:18 AM   #160
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Default Gee Whiz...This Stuff Works ! ! !

Before I ruin this project with what someone said will work... ;^) I thought it best I test it myself... :^)

Well we survived the impact testing no worse for ware. No I did not use a durometer or drop test.
I simply beat the coated surfaces on the sharp edge of my glass top desk and rounded steel back
of a folding chair. Real world-harms way surfaces that can ruin a typical XPS or EPS project.



I wonder how thick that two coat brushed on surface is? Looks to be 1/16th of an inch thick.



What on earth is this? What happened to the foam?


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Old 08-18-2014, 04:30 PM   #161
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Default What Happened Here???

What on earth is this? What happened to the foam?


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Old 08-18-2014, 04:49 PM   #162
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Originally Posted by Flite-Metal View Post
What on earth is this? What happened to the foam?
You tell me.

Life's journey is not to arrive at the grave in a well preserved body,
but rather to skid in sideways totally worn out shouting, Holy Crap... what a ride.
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Old 08-18-2014, 06:04 PM   #163
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Default Answering A Question With A Question... :(

Originally Posted by simibill View Post
You tell me.
Certainly the Valley can do better than that...? Or is that a Simi answer with more to come?

Inquiring minds need to know.

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Old 08-18-2014, 09:20 PM   #164
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Default Flexability

Given the amount of flex in the wings of this bird, how does this application handle the stretching and contraction aspect?
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Old 08-18-2014, 09:31 PM   #165
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Default Wing Flex

Originally Posted by pattern14 View Post
Given the amount of flex in the wings of this bird, how does this application handle
the stretching and contraction aspect?



As much as I dislike having to answer a question with a question of the inquirer...You apparently
have something consequencial in mind. Please share that and I will see if it applies to my B-47's.



The Polyurea resin is in addition to our normal wing, horiz stab, and vertical fin construction. The
wing is foam core, vertical fin and horiz stab are combination built up and foam.


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Old 08-19-2014, 01:03 AM   #166
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It looks like you were separating the fiberboard from the foam or did the finish eat the foam??? We can't see all the evidence....

Take care and thanks for posting at WattFlyer!!

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Old 08-19-2014, 03:26 AM   #167
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Default Wicking

Originally Posted by Don Sims View Post
It looks like you were separating the fiberboard from the foam or did the finish eat the foam???
We can't see all the evidence....
Primer is applied to the EPS or XPS before application of Polyurea resin. Primer wicks down within the EPS beaded foam or
along cell perimeter of XPS Dow Styrofoam.

Primer is extremely agressive in its wicking and tack when dried. It becomes a secomd skin to the foam. What you are seeing
above is primer which is still attached to the cured Polyurea Resin, yet it detached from the EP Polystyrene beads when the
cured Polyurea skin was peeled off the foam block. Yes, that is the Polyurea hard skin peeled off foam...taking considerable
effort to do so.

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Old 08-19-2014, 07:06 PM   #168
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Originally Posted by Flite-Metal View Post



As much as I dislike being asked a question, then turning around to ask another of the inquirer...You
apparently have something consequencial in mind. Please share that and I will see if it applies to my
B-47's.


The resin is in addition to how I am already constructing the wing, horiz stab, and vertical fin.
It was a just a general enquiry regarding the flexability of the resin being used i.e will it wrinkle or lift/seperate from the foam after prolonged wing flex? Not knowing much about your "flite metal" covering I was curious about how that stands up as well. I've used numerous covering methods and found that constant wing flex, particularly on foam, leads to cosmetic blemishing eventually. Nothing so consequential as being crash resistant, more unsightly in a couple of hundred flights from now
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Old 08-19-2014, 08:02 PM   #169
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Default Consequence Of Repeated Wing Flex Using Polyurea Resin

Originally Posted by pattern14 View Post
It was a just a general enquiry regarding the flexability of the resin being used i.e will it
wrinkle or lift/seperate from the foam after prolonged wing flex? Not knowing much about your "flite metal" covering
I was curious about how that stands up as well. I've used numerous covering methods and found that constant
wing flex, particularly on foam, leads to cosmetic blemishing eventually. Nothing so consequential as being crash
resistant, more unsightly in a couple of hundred flights from now
Thanks for asking:

I just reread my wording in that last post and it sounded curt, I did not mean it to be. I was late to leave and rushed
my wording. Sorry if it sounded gruff!

I understand your concern for what I call Styrene blush after too much flex. I have no idea what the degree of flex
is to surpass the flex tolerence of Polyurea Resin. In all the flexing experienced with the Tu-95 over its two years of
flight, never showed any cosmetic or other degradation.

Polyurea resin's ability to not show changes in appearance is amazing. I am sure its flex can be surpassed, but so far
I have found nothing to make me think my flexing will effect it... He said with great confidence Remember multiple
spars in inboard section of wings are tied into pylon receiver box and the inboard~outoard receiver spar-box.

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Old 08-19-2014, 09:10 PM   #170
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Sounds good then I did not think you were gruff at all; in fact this is about the only thread I still bother to follow on Wattflyer. I've gotten a little jaded with all the parkzone type posts and some of the over inflated egos of late, but this thread remains a continual source of knowledge and interest. I really do want to see this fly
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Old 08-19-2014, 10:48 PM   #171
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Back when I started the thread my intention was to help improve on the content. Don for one is to
be commended, or committed for seeing this site is not a boiling caldron like others.

RC Groups seems to have improved to the point where I do not see flaming as much as in the past.
There for a while there were some with an attitude of my way or the high way. RC Groups monitors
pretty much don't let anything slide for sake of things getting out of hand again.

RCSB has had its early teething pains move forward. There for a while if you were not building $10k
to $15k projects your thread stood a chance of being scoffed at. Discussion forums can hatch some
intersting internet animals.

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Old 08-21-2014, 12:50 AM   #172
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OK, moving along.

This is a quickly thrown together illustration of the asymetric distribution device used to distribute even
flow of Polyurea Resin across surface of the B-47 sections covered with the resin. Note the red arrows
were intended to indicate rotation of the disk. I failed to rotate it every frame...

The circle is there only to show the black rectangle in the center is really the edge of the plywood circle
with a 1 RPM motor attached to spin it slowly to assure even distribution of resin which has been spread
across it.

The circle has a rectangular piece of wood stuck through it onto which the opposite end is slide into a hole
in the CNC or Hotwire cut Hi Load 60 Polystyrene to permit its asymetric motion will assure Polyurea has
been distributed evenly across the surface while it is curing.

The device will run over night while resin cures. After removal from the circle, the rectangle and foam part
are moved to a safe location permitting it to complete the curing process.

This looks awful but should get the idea across easier than text by itself.

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Old 09-19-2014, 10:10 PM   #173
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We were getting too far away from my original posting of these and thought some of the
newbee thread followers would appreciate some reference materials for their B-47's. It'll
help you find what you are searching for.


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Old 10-27-2014, 08:48 PM   #174
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Default Bernie's B-47 Passes

A lot to be learned from this footage...Feed back from everyone welcomed



Bernie's B-47 flite provides a lot of valuable witnessing, especially its lack
of stable attitude.

Bernie's construction was balsa built up, exactly as Joe's yet it was twice
the size. Joe Martin is seen below with his B-47D New England Scale Classic
'63 & '64 entry.





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Old 10-30-2014, 10:58 AM   #175
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Ed, I've gotten this "Contact the Administrator" message this morning and posted it here for your documentation but edited out the addresses and some personal details. I'll PM the actual contact info and original message to you.
Don

I have a message for one of your members
The following message was sent to you via the WattFlyer RC Electric Flight Forums - Discuss radio control eflight Contact Us form by MARGARET.

--------------------------------

I was browsing and came across a posting from your member Ed Clayman
"Flite-Metal" asking for more info about a B47 line drawing by Chris Davey.

Actually my maiden name was Margaret and as Chris's long time girlfriend I did the tracing for this (and many other) illustrations that Chris did for the centre spread of Aviation News.

Can you please let Ed know that if he still wants to contact Chris Davey his mum still lives at the same address and her contact details are:
Mrs M.P Davey: England.

I now married and live in Canada and have not seen or spoken to Chris in literally decades but as my family still lives in England I do know of his family contact details.
I hope this helps.
Kindest regards
Margaret

Take care and thanks for posting at WattFlyer!!

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