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EAC Mach1 prebuild questions - 11/13/2012 11:38 PM   
pilotx


 

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From: Avilla , IN, USA
Status: offline 		Ok guys, just a couple of questions before I get started on this build. I have a Eureka Aircraft Mach1 and MAN plans

Any info will be appreciated, THANKS in advance

Spars: are they needed in the construction of the foam wings? I was planning on laminating some Carbon thread its like 3/8 inch wide from DaveBrown Products is this enough? or do i need more.

I'm using Mechanical Retracts in this one just to keep with the Old School era of this build and i am having a hard time wraping my head around how with a single retract servo in the wing, how is the front/nose gear actuating wire hooked up and removed when transporting with the wing not attached to the plane? seems like a pain in the butt to unhook this each time. I'm thinking of using a small servo in the nose wheel bay to simplify this.

also i have two choices of glue for sheeting the wing, both are on hand in house one is 3M 77 spray and the other is Elmers Ultimate is either one better that the other

this is my first pattern build and i am planning on doing a build thread if their is any interest?

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RE: EAC Mach1 prebuild questions - 11/14/2012 1:11 AM   
doxilia



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Status: offline 		Spars: forget about small balsa spars in the foam wing unless used to support the landing gear block back to the root. CF is definitely the way to go. Use two under the wing, one near the 30% chord line where it doesn't interfere with anything else and another along the TE. You can optionally use another on the core top.

Retracts: use two servos for less headaches. You might wind up with a third small servo for steering in the nose bay.

American 3M 77 will dissolve foam. Canadian 3M 77 is a different formulation and doesn't. Regardless, I would recommend polyU (Elmer's) or laminating epoxy.

David

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RE: EAC Mach1 prebuild questions - 11/14/2012 1:55 AM   
PatternPilot



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Status: offline 		+1 on what David said....

We do a .007 x 1/2 wide carbon strip top always , bottom sometimes.

That is why I like Taildraggers...

That's right, on the spray glue... David I have lost my Canadian vendor info for the Spray 77 do you have info for a source ?

Elmer's polyglue the only way to do wings !! I have a set drying now.

Scott
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RE: EAC Mach1 prebuild questions - 11/14/2012 2:01 AM   
J Strong


 

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Status: offline 		This is the inside look of one of my two Mach Ones.

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RE: EAC Mach1 prebuild questions - 11/14/2012 2:06 AM   
J Strong


 

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Status: offline 		This is my two Mach Ones, pictured with their builder, Art Azlin from Huntsville.


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RE: EAC Mach1 prebuild questions - 11/14/2012 3:53 AM   
doxilia



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quote:

ORIGINAL: PatternPilot

That's right, on the spray glue... David I have lost my Canadian vendor info for the Spray 77 do you have info for a source ?

Scott
CPA#2

Scott,

Just about every hardware, paint supply and art shop here carries it. But probably the easiest place to order from online is Canadian Tire.

David


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RE: EAC Mach1 prebuild questions - 11/19/2012 6:34 PM   
Alan W


 

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Status: offline 		Damn ... thats Sexxxy

(the Mach's ... not the builder but props to him on his skilz)

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RE: EAC Mach1 prebuild questions - 11/19/2012 8:13 PM   
hrrcflyer


 

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Status: offline 		Pilot,
Go ahead and do a build thread, I for one will follow along..............

Jamie,
I have a dumb question for you. In the first picture you sent, what is the short rod with the ball links connected to the middle of the rudder servo for?

David

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RE: EAC Mach1 prebuild questions - 11/19/2012 9:17 PM   
doxilia



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quote:

ORIGINAL: hrrcflyer
Jamie,
I have a dumb question for you. In the first picture you sent, what is the short rod with the ball links connected to the middle of the rudder servo for?

David

David,

that's a good one. I was wondering the same thing at first and then I realized that it probably is a "servo stabilizer". The rudder servo wants to be very firm in place and one way to "cement" it is to lock the output shaft in place by using a firm short pushrod anchored to the plate. The ball links allow the servo arm to rotate but the lock rod keeps it from moving fore-aft or side-to-side.

Jamie, please correct me if I'm wrong.

David


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RE: EAC Mach1 prebuild questions - 11/19/2012 9:25 PM   
J Strong


 

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Status: offline 		That's exactly right. It's a stabilizing shaft support sold by Horizon. I've heard cases where a few servo gears snap off at the point of the shaft with no support, but never seen it personally. JR' s 821 servo is the one I have heard of, on more than one occasion.

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RE: EAC Mach1 prebuild questions - 11/19/2012 11:29 PM   
pilotx


 

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From: Avilla , IN, USA
Status: offline 		still getting things sorted out for the Mach1, while finishing a 1/5 scale mustang. I hope to start in honest after the Thanksgiving hoilday...

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