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HelicopterScale Model RC Helicopters Docs  Starting the NEW Project...Turbine (Big) CH-53
12-13-2008 08:50 PM  8 years agoPost 21
coptercptnrrElite Veteran - Mesa AZ. USA - My Posts: All  Forum  Topic

Worked on the Mechanics today and got the Turbine mounted w/servos and swashplate. The pushrods will have to be made yet... but, I have the templates made up using threaded rod and it all looks good so far..

Here is with the TX..for a scale of how big all this is...

I'll take some better pics later... the light is poor and a lot going on today, so bear with me for now..

Home of the "Sea Cobra".....

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12-13-2008 09:26 PM  8 years agoPost 22
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rrApprentice

Chandler, AZ

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Those mechanics look good. Have you come up with a plan for the woodwork?

Don't Panic

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12-13-2008 10:09 PM  8 years agoPost 23
coptercptn

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Mesa AZ. USA

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Yes I have two of the bulkheads in place already...I wanted to get an assembled height for the mechanics to determine floor etc..I also think I am going to take about 4-4 1/2 inches off of the main mast and lower the rotor head...The tail drive exit was the key to it all as I don't want anything other than a straight shaft going back...once everything is mocked up I can get to building the rest of the lumber parts. And of course figuring out all of the electronics!! and Fuel system.

Oh, And I almost forgot..I am going to steal your idea for opening up the top of the fuse for access and maintenance..it also looks like it makes it easier to build the Engines and oil coolers/shafts etc.
Thanks for that idea Arlo....

Home of the "Sea Cobra".....

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12-13-2008 10:13 PM  8 years agoPost 24
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rrApprentice

Chandler, AZ

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All the exact same things I had to do to mine. It was a lot of fun designing everything myself. It'll make flying it for the first time that much more satisfying.

Don't Panic

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12-14-2008 04:47 PM  8 years agoPost 25
coptercptn

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Mesa AZ. USA

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So Far I have seen 5 of these built, and no two have used the same mechanics!!!

Home of the "Sea Cobra".....

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12-14-2008 05:09 PM  8 years agoPost 26
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rrApprentice

Chandler, AZ

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I think I've collected every picture of this model off the internet and seem to have 11 different ones, not counting mine or yours. Most are done as the CH-53, 3 are done like the MH-53 PaveLow. Yours will be the forth with turbine. Most have a 20cc Webra, one has a 40cc gas and I've even seen one electric.

Don't Panic

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12-14-2008 05:13 PM  8 years agoPost 27
coptercptn

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Mesa AZ. USA

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OF actually sent me a CD with their research material on it and some helicopters they built...did you get that?

Home of the "Sea Cobra".....

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12-14-2008 05:15 PM  8 years agoPost 28
coptercptn

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Mesa AZ. USA

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If it wasn't for the antennae hanging down!!!!...pretty real lookin!

Home of the "Sea Cobra".....

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12-14-2008 05:17 PM  8 years agoPost 29
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rrApprentice

Chandler, AZ

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I did not get that cd. That is the model that made me want to build mine.

Don't Panic

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12-14-2008 05:25 PM  8 years agoPost 30
coptercptn

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Mesa AZ. USA

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I did think long and hard about doing it electric....but was afraid of not enough power..and when you said yours with a gas engine was under powered i went with the turbine.

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12-14-2008 05:26 PM  8 years agoPost 31
coptercptnrrElite Veteran - Mesa AZ. USA - My Posts: All  Forum  Topic

here are a couple more of the "OF" built models

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12-15-2008 04:35 PM  8 years agoPost 32
coptercptnrrElite Veteran - Mesa AZ. USA - My Posts: All  Forum  Topic

So....on with the build:

With the "Kit" (and I refer to it loosely as a kit)you get:
1) 1 Big honkin' chunk of Fiberglass/CF fuselage.
2) 2 sheets of light ply (but nice quality lumber I will say).
3) 3 Card stock templates (Hand drawn) for the bulkheads.
4) 3 retracts and gear mechanism.
5) 3 sheets of window glazing.
6) no (until just recently)instructions!!!

So to say this was an advance/craftsman type kit would definitely be an understatement!!!

The starting point for me was the retracts. The kit provides you with a set of bulkheads and axles for a rather unique mechanical retract system.
Don't get me wrong it is simple ..but works great!
The first step is determining "Where" it is all supposed to go...
(And yes bwellmaker I DO have a bit of advantage here, having worked/flown these critters for 4 years...)

Anyway the fuselage has detail bosses cast into the fuse to give you a general idea where the gear should go. A few reference photos and a little trial and error fitting the bulkheads (well actually a lot of T&E!!) and the gear is in place..

The connecting shaft operates an over center bellcrank to make the gear retract..This shaft on the mains runs through the cabin and connects both sides..I have a HS75BB retract servo to operate it.

The nose gear is a lot more plywood. I decided to make the unit removable for future work on the cockpit etc, so, I made the nose gear bulkheads into a box. A few lightening holes and an additional bulkead to secure it to the fuse, and the nose gear is operating.
I also built in the servo so it too comes out with the gear assy.
It does add a bit more weight but these things are a BUNCH tail heavy anyway...

Now with the bird on its feet..I can work on the tail.

I guess now would be the time to mention the adhesive of choice for all this wood working...PFM.
I got turned on to it by Peter Wales and all I can say is the stuff is awesome!!!
And..a bit pricey. but here's a tip....E-6000...

Go to Walmart,etc and you can find this stuff on the shelf for 1/3 the price available as "PFM" and IT"S THE SAME STUFF!!!!!
The real beauty of this stuff is how easy you can work with it and it really does bond "anything to anything" (You can also thin it with water and use it to fuel proof!)

The Tail stuff:

Here is a shot of the gear boxes and bulkhead. (you have to make your own bulkhead..they give you a rough hand drawn card stock template
and then you work and fit..(well you know the drill).

And now just fit it into the fiberglass and add some PFM/E-6000...


This is a stock photo from the builders disc I just received I will update later with pics of my actual 53 (when it warms up an I get out to take a few pictures...)but the same basic construction...

well, that's all I have time for right now...enjoy

Home of the "Sea Cobra".....

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12-16-2008 01:15 AM  8 years agoPost 33
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rrApprentice

Chandler, AZ

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No fair, you got 3 sheets of window glazing. The only piece I got was the nose. The most important one I guess. Did you get the fin looking pieces that attach to the fuse either side of the upper door?

Don't Panic

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12-16-2008 07:00 AM  8 years agoPost 34
WillyS

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HOBART, OK USA

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Keep the pictures coming for us,this heli is a beauty

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12-16-2008 02:46 PM  8 years agoPost 35
coptercptn

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Mesa AZ. USA

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not sure which pieces you are referring to Arlo? You mean the forward entry door? if so yes... there is a sheet that has all the side windows on it. even one for the back cargo door hatch.

Home of the "Sea Cobra".....

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12-16-2008 04:18 PM  8 years agoPost 36
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rrApprentice

Chandler, AZ

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I got the the glass work for the nose but none for the side windows. On the sides of the rear cargo door are two fin looking protrusions. I think they were supossed to come with the kit but mine didn't have them.

Don't Panic

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12-16-2008 06:34 PM  8 years agoPost 37
coptercptn

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Mesa AZ. USA

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still not sure of where you are referring to..can you shoot me a pic of the area?

Home of the "Sea Cobra".....

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12-16-2008 06:49 PM  8 years agoPost 38
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rrApprentice

Chandler, AZ

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Here are some bad pictures of the pieces I'm talking about. I had seen in a picture of a kit that it came with them. I'll just make them but was wondering if your's had them.

Don't Panic

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12-16-2008 07:40 PM  8 years agoPost 39
coptercptn

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Mesa AZ. USA

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ok ..yes that's what I thought you were referring to...The model I have came with a shorter version of that "Cast in" but I see from the CD that one of "Their" models has them "enhanced" and it looks like all they did was add some balsa to the existing fin and shape it...I have that disc copied and will get it to you asap..

here is theirs..

bTW, you are going to make the tail scag functional right???? It was integrated with the landing gear so that when the gear goes up the scag went up. And also had an over ride for loading "excess height" vehicles.

I plan on having it work with the LG but not the override....

Home of the "Sea Cobra".....

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12-16-2008 09:11 PM  8 years agoPost 40
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rrApprentice

Chandler, AZ

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That's what I'm talking about.

I'm going to make the tail scag work. I will use a mix in my radio so that when the gear is down it'll be down. But when the cargo door is opened all the way it'll retract up.

I can't wait to see that cd. I'm going to end up redoing half my heli with the ideas I get from it.

Don't Panic

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HelicopterScale Model RC Helicopters Docs  Starting the NEW Project...Turbine (Big) CH-53
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