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HomeScaleAircraftScale HeliScale Helicopter Main Discussion Docs  S-76 Build
11-07-2015 04:38 PM  3 years agoPost 1
Thumper217

rrApprentice

Slidell, LA - USA

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About two years ago I came across a deal for a set of Peka scale mechanics on RR that was too good to pass up. The transaction was completed and then I had to find something to put them to good use. The S-76 has always been my favorite helicopter and I know that these mechanics would fit in a large scale version the problem was locating one. After talking to a few people familiar with the model I found someone in Germany that would make a fuselage for me and provide the woodwork for the Peka mechanics and the electric landing gear. It took several months but I finally received a big box on the front steps. I had some explaining to do to the wife as it was way to big to hide...

Since then I have been going back and forth with exactly how to start this project. The first major issue that came up was the tail drive. the Peka mechanics are set up for a cable drive and I just don't like them. I have seen this model fly with a cable drive and while it flys really well you can still hear the cable winding and unwinding and that makes me very uncomfortable. I know they work but it's just my personal preference to not use one. I struggled with this issue for a long time and in fact was on the verge of just using the mechanics as is with the cable drive when I came upon another option that I think will work really well.

I have always wanted to be able to get the mechanics up in the dog house and race car so that I could do a complete scale cockpit and cabin but the cabin wouldn't be possible with the Peka mechanics. However, there is a member on here that has designed a set of mechanics that will fit up top and will allow me to use a hard shaft to drive the tail.

So now after almost two years I am ready to get started on this build. It is going to be my first really large scale build, this fuselage is 7ft long! It is going to take a lot of planning ahead in order to accomplish all the details that I would like to do. I will try and keep this thread updated regularly and hope to get advise and instruction from everyone one here, I am always open to constructive criticism and alternate ways of doing things.

Andrew

Thumper

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11-07-2015 05:06 PM  3 years agoPost 2
Mojave

rrElite Veteran

Palos Verdes, Ca. USA

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Super cool project, I'm subscribed. Can't wait to see it come together. I'm also looking forward to seeing the custom mechs set...
Barry

All helis and planes have an expiration date stamped on them...you only find it after you crash!!

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11-07-2015 06:33 PM  3 years agoPost 3
bwellmaker

rrKey Veteran

Long Island

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Yea,

I am on this one too.

B

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11-08-2015 12:37 AM  3 years agoPost 4
Thumper217

rrApprentice

Slidell, LA - USA

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Here is the full size I am going to model. I can only find a few pictures of this one so if anyone out there knows anything about this particular aircraft please let me know as I need more pictures.

Thumper

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11-08-2015 03:12 AM  3 years agoPost 5
coptercptn

rrElite Veteran

Mesa AZ. USA

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Andrew, if you are hearing the cable winding/unwinding you are using the wrong "wrap" on the cable, and probably too small of a cable...? I can fix both of those situations for you....
My 53 is running a 4 bladed 140mm and has no wrap up...(cable drive)

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

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11-08-2015 01:18 PM  3 years agoPost 6
Copter Doctor

rrProfessor

Enterprise/ft.rucker ,al- home of army aviation

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Andrew, you share my passion for the S-76. I too have been on and off the back burner with mine. I am planning to use a cable drive in mine however as I have had the best luck using that system on my other machines. Like Jim said, the windup sound heard with a cable system is due to the incorrect wrap or rotation direction of the cable.
I have two fuses in the 700 size. one is being built while the other I am considering using to make a mold.
I will be watching your build and look forward to more pics and progress

drive a rotary, fly a rotorcraft

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11-08-2015 01:42 PM  3 years agoPost 7
doorman

rrProfessor

Sherwood, Arkansas

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Great Project!!
I am in too!!
No doubt that you will build an outstanding creation...
Subject heli is good looking too..
I will mention one thong for now though..
I would make sure that I am able to get all the pic's and info on the subject before any detailing begins, IF, you are planning to compete with it...
In the mean time get that baby started!!
Stan

AMA 2918-Team Spin Blades,,Castle Creations, Unique Aircraft

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11-08-2015 01:48 PM  3 years agoPost 8
doorman

rrProfessor

Sherwood, Arkansas

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Info
Put the N # into Google Search, and it brings up the owner of this heli (Wells Fargo) and you might be able to contact a pr rep and get the info you need..
Hope this helps you out!!
Stan

AMA 2918-Team Spin Blades,,Castle Creations, Unique Aircraft

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11-08-2015 02:23 PM  3 years agoPost 9
g5sean

rrNovice

Savannah, GA

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Hi Andrew,

I like the N number since it has my initials! The pictures I've seen online show two locations, Houston Executive airport and Atlanta Fulton County. You could check with the FBOs at each airport to try and figure out where it is based and who the operator is. Given that the owner is shown as a bank, the operator is leasing it from them. Probably won't get anywhere asking the bank due to privacy reasons and Flight Aware shows the aircraft blocked from public view which is typical of corporate operators.

Sean

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11-08-2015 03:12 PM  3 years agoPost 10
Thumper217

rrApprentice

Slidell, LA - USA

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Thanks guys for all your comments. I know many people have had great success with the cable drive systems and that it is a well proven system it is just my personal preference to attempt to go with a rigid drive. I will post some photos later today to show the basic setup.

I definitely want to get more photos for documentation. I new about the Wells Fargo connection but assumed that it was probably just the owner in name only not the operator. The location info is great I didn't know about the Atlanta connection so that gives me two leads.

Andrew

Thumper

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11-09-2015 12:47 AM  3 years agoPost 11
Rckfish

rrVeteran

Little Rock,AR

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Keep us posted Andrew!
Paul

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11-09-2015 03:28 AM  3 years agoPost 12
Thumper217

rrApprentice

Slidell, LA - USA

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One of the challenges I face for this build concerns weight both the amount and location. As with most this heli is prone to be tail heavy and heavy in general. I know of one that tips the scales at 42 lbs. so my goal is to build it as light as I can and try to reduce the amount of nose ballast I will need to get a good CG. The mechanics I will be using are going to be lighter than the PEKA mechanics but the motor will be mounted aft of the shaft instead of forward. I will be placing the main batteries (four 6cell 5000 packs) forward of the main shaft along with the batteries for all the electronics, lights, etc. The bulkhead supplied that the main landing gear mount to is constructed of 1/4" plywood and weighs in at 150g so I have replaced it with a carbon fiber/plywood laminate from Dragon Plate that weighs 75g and I also made up a few of the other bulkheads aft of the main shaft out of the same material.

Thumper

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11-09-2015 03:50 AM  3 years agoPost 13
Thumper217

rrApprentice

Slidell, LA - USA

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The tail drive shaft alignment has been difficult for me to figure out exactly how I was going to work it out, but over the weekend while laying out the position of the mechanics using a template that I have It occurred to me that if I run the tail drive shaft in the same location as it is on the full size the alignment will be within an acceptable angle to use the Vario articulated couplings. It required a cut out in the fuselage at the forward end of the boom in an area that will be covered by the aft cowling and I will be able to mount the drive shaft in a standard tail boom tube and support it with standard bearings.

Thumper

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11-09-2015 03:57 AM  3 years agoPost 14
doorman

rrProfessor

Sherwood, Arkansas

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Looking Good
Looks as if you have some good ideas, and they will payoff at the end of the project...
No doubt, it will be a great looking and working heli!!
Stan

AMA 2918-Team Spin Blades,,Castle Creations, Unique Aircraft

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11-14-2015 05:47 PM  3 years agoPost 15
Thumper217

rrApprentice

Slidell, LA - USA

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Because I want to do both a forward cockpit and aft cabin I am having to change some of the original locations of the bulkheads and longitudinal frames. I added a bulkhead between the cockpit and cabin. for now it is solid but I will be cutting out two areas on either side for the pass throughs behind the pilot and co-pilot like on the full scale.

Locating the flight battery packs has been difficult to figure out, there are going to be four 6S 5000 or 6000 MaH packs two in series and two in parallel. Even though this is a big fuse there is not much space to hide stuff. I only have about 3.5 to 4 cm of room between the bottom of the fuse and where I will but the floor, which is enough room for smaller packs for the lights and accessories but not flight packs. There is plenty of room aft of the main shaft but thats way to much weigh back there. So what I'm planning on doing is putting two packs vertically just behind the forward bulkhead and two packs on top of the base for the mechanics under the dog house just forward of the mechanics.

This way I will still be able to but the two aft facing seats in the cabin and the battery area will be where the center console is that houses the flat panel TV, bar and coffee maker

Andrew

Thumper

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11-15-2015 04:50 PM  3 years agoPost 16
Keygrigger

rrVeteran

Mississauga, Ont. Canada

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Nice build and subject, Andrew. See you soon.

Don

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11-16-2015 11:49 AM  3 years agoPost 17
Thumper217

rrApprentice

Slidell, LA - USA

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Thanks Stan and Don, I just hope I can do it the justice the S-76 deserves.

Someone suggested that the batteries might get a little warm all closed up in boxes and that I should cut some holes to allow air flow and reduce the weight. That was a good idea that I hadn't thought of so I cut some holes...

I also made the forward stringers out of dragon plate. The original plywood stringers run continuously from the nose to the rear landing gear bulkhead and supported the mechanics. I didn't have any dragon plate that long so I am planning to make the stringers in sections with enough overlap between sections to allow for a good epoxy bond and back that up with a mechanical bond by way of transverse stringers that will interlock with the longitudinal stringers at the overlaps. I'm curious to see if those with experience think that is a good idea or not. dragon plate that is long enough to go the distance is about $400.00 a sheet

Thumper

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11-16-2015 12:25 PM  3 years agoPost 18
bwellmaker

rrKey Veteran

Long Island

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Andrew,

You will be good with the splices as long as you 'sandwich" the splice with at least an inch on either side of the splice. If you can place the splice at a bulkhead location, that would be even better.

Things are coming together Mang,

B

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11-21-2015 01:47 AM  3 years agoPost 19
Thumper217

rrApprentice

Slidell, LA - USA

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Played hooky today from work and got some work done. Longitudinal stringers have been cut out and set in place. There is an approximately 3" overlap with the forward section of stringers in the cockpit at the bulkhead so that should allow for plenty of bonding area.

The next project I will be tackling is splitting the race car cowling. This will allow me to remove the cowling without having to remove the head. This is important as I will be putting the flight batteries under this cowling. There is a panel line on the full scale where I have drawn the pencil line. I will cut transversely here and then split the middle section longitudinally down the center. Any advise before I start making the cuts? I will be putting plywood reinforcement at the areas where the new seams will be. Should I fabricate and install these first?

I am anxiously awaiting the mechanics so I can start fabricating the upper deck.

Andrew

Thumper

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11-21-2015 08:42 PM  3 years agoPost 20
CoachE

rrApprentice

Cincinnati, ohio -usa

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looking GOOD!!!

BD Team Pilot / Get !T - Got !T - Perfect !T

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HomeScaleAircraftScale HeliScale Helicopter Main Discussion Docs  S-76 Build
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