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JR-Spektrum . E-flite . Fast Lad Performance

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Scale Model RC Helicopters > Proud Owner of Cobra 60
 
 
Dr.Tim
Key Veteran
Location: Mojave Desert

My Posts This: Topic  Forum

All I can say is WOW!!!
Grant, nice work on the framing for the cut .. nicely done!


Dr.Tim

From Simple minds come simple ideas! Starwood Models, Approach Engineering .
09-08-2009 09:40 PM
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jzanutto
Senior Heliman
Location: Fresno, CA

My Posts This: Topic  Forum		I will shape it and glue it on soon
09-08-2009 10:24 PM
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GrantL
Senior Heliman
Location: Springfield, MA

My Posts This: Topic  Forum		The Trans Housing is Split

I split the housing today and I'm very happy how it came out.. I used a jeweler's saw which gives a very fine cut.. I added some tabs in the dog house area but it really didn't need it.. Everything was rock solid..



I need to do some sanding of the edges for a cleaner look and it's complete.

Grant
09-09-2009 06:38 PM
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jzanutto
Senior Heliman
Location: Fresno, CA

My Posts This: Topic  Forum		here it is painted. There are a few small issues to deal with. I need to work on my trans housing split line and clean it up


09-10-2009 12:35 AM
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ChopperCrazy
Heliman
Location: Sykesville, Pa. USA

My Posts This: Topic  Forum		Man you are good, I would be happy with any chopper that you built. Keep up the great work, and thanks for all the build pictures.
09-10-2009 01:02 AM
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bow2986
Heliman
Location: australia

My Posts This: Topic  Forum		Jzanutto, you are doing a great job there, i am building the cobra for electric 500, i only have my fuse left to glass, all other parts are done ready to prime,what colour paint is that on your heli? i would like to do mine the same, thanks Jzanutto
09-10-2009 09:06 AM
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jzanutto
Senior Heliman
Location: Fresno, CA

My Posts This: Topic  Forum		this paint is an automotive primer, you will need to go to a paint supplier to get it. It is DuPont A-4115S, green
09-10-2009 04:35 PM
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jzanutto
Senior Heliman
Location: Fresno, CA

My Posts This: Topic  Forum		I decided to go with brass barrels, I like the open ends

09-12-2009 02:09 AM
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GrantL
Senior Heliman
Location: Springfield, MA

My Posts This: Topic  Forum		I like the brass gun barrels Jan.. Nice!! Here are some progress pictures..



Grant
09-13-2009 06:45 PM
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jzanutto
Senior Heliman
Location: Fresno, CA

My Posts This: Topic  Forum		Grant I was looking for something else to use for my exhaust. What are those objects that you used? cups?
09-13-2009 09:09 PM
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GrantL
Senior Heliman
Location: Springfield, MA

My Posts This: Topic  Forum		It's a Jello fruit cup for the base and the plastic top off a Testors spray can.. The top is roughed up with sandpaper to look like the exhausts in one of the Cobra pictures in Dr Tim's CD..

Grant
09-13-2009 09:34 PM
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jzanutto
Senior Heliman
Location: Fresno, CA

My Posts This: Topic  Forum		thats the look I'm looking for. It was really bothering me because I used to work in a turbine engine shop as a mechanic, then the shop manager and having seen real turbine exhausts for so long the featureless straight paper was making me break out in hives....

did you leave it open so air can pass through? I plan on having mine open so I can get some extra cooling airflow through there
09-13-2009 09:38 PM
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jzanutto
Senior Heliman
Location: Fresno, CA

My Posts This: Topic  Forum		I have the wings done, and the stabilizer. also pieced the gear together just to see how it looks with it attached. Doc Tim, do I push the side struts further into the fuselage? I think I am going to use some small 4-40 bolts to hold all the gear tubing joints together.

09-13-2009 09:49 PM
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Dr.Tim
Key Veteran
Location: Mojave Desert

My Posts This: Topic  Forum		The Landing Gear looks pretty good were you have it. You can adjust it in or out to suit .. after it is good you can whick in some thin CA or I Like to use 1/2 hour Epoxy, Adjust it were I like it then let it setup. The Thin CA Method allow NO TIME TO ADJUST so have it right the first time!! After I have one side correct I block up the fuselage (A Small box or something under the belly) then setup the other side Skids .. this way they will be the same and the helicopter won't sit funny ...

I leave alot of the details up to the builder and just provide the basics ... Grants Exhaust Idea is BRILLIANT!!!

Dr.Tim

From Simple minds come simple ideas! Starwood Models, Approach Engineering .
09-13-2009 10:07 PM
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jzanutto
Senior Heliman
Location: Fresno, CA

My Posts This: Topic  Forum		hey Grant it would look realistic if you cut a thin band of styrene or just heavy paper stock, say about 1/4 inch wide and wrap that band around that joint in the tailpipe. It would look like a stiffener band
09-13-2009 10:11 PM
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GrantL
Senior Heliman
Location: Springfield, MA

My Posts This: Topic  Forum		Yes Jan.. I cut out the opening so I would have the flow thru ventilation..

This is the look I was shooting for.. Pretty close I'd say..



Thanks for the kind words Dr Tim...

Grant
09-13-2009 10:38 PM
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jzanutto
Senior Heliman
Location: Fresno, CA

My Posts This: Topic  Forum		wow. just went to CVS/foodmart, then SaveMart, then an off-brand market, then food max. Nobody here carries jello brand fruit cups. and all the other fruit cups have some odd serrations pressed into them or the word "MOTTS" stamped into them.

Just as I was leaving I saw the foodmax brand applesauce cups - exactly the same thing. No serrations, or embossed letters. Perfect, 6 for 1.98
09-13-2009 11:34 PM
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jzanutto
Senior Heliman
Location: Fresno, CA

My Posts This: Topic  Forum		Hey Doc,

getting really picky here, what we are seeing there is actually the airframe tailpipe, then inside that you should see the actual engine exhaust stub pipe. Right?

Just checking, because thats the way its done on all other airframes I've worked on. Basically that outer unit goes over the engine's exhaust stub, and usually there is a gap between the 2, forming an eductor, which uses the engine's escaping exhaust gasses to pull air through the engine compartment through the gap.

is that true on the cobra?
09-13-2009 11:40 PM
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Dr.Tim
Key Veteran
Location: Mojave Desert

My Posts This: Topic  Forum		That's correct Jan, It's refered to as the IR suppressor .. there is a vacuume effect as the Hot gas escapes the outer "FINS" suck cool air in to cool the exhaust temps ... works pretty well but the Jello cup I think will make it just cool to have around!

Dr.Tim

From Simple minds come simple ideas! Starwood Models, Approach Engineering .
09-14-2009 12:07 AM
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jzanutto
Senior Heliman
Location: Fresno, CA

My Posts This: Topic  Forum		ok let the insanity begin. I am taking a little departure to work on the instrument panels. This is my pilots panel. Styrene over balsa, instruments are behind the panel, then little bezels go on top of the panel for that extra effect. Ok all you nit-pickers, the panel is BASED on a real cobra panel, but there are a few items missing that it wont have. The average guy, or 4th grade kid who shows up at the school that I fly at wont know the diff. I will paint the styrene flat black. Side panels will be the same. Going to go to hobby town to look through the train stuff for things that look like dials or toggle switches. Might just make my own out of stick styrene.

09-14-2009 02:06 AM
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19 pages [ <<    <     2      3     ( 4 )     5      6     NEXT    >> ]10723 viewsPOST REPLY
Ace Hobby . Esprit Model . Thunder Power RC

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Scale Model RC Helicopters > Proud Owner of Cobra 60
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