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Speed,Combat,Scale,Racing => Carrier => Topic started by: Jim Oliver on October 22, 2012, 11:27:53 PM

Title: More Brodak Guardian questions
Post by: Jim Oliver on October 22, 2012, 11:27:53 PM

Making slow progress on the Guardian; planning on a TT 36 with a 4 oz. plastic tank, unless otherwise advised......
is there any reason not to mount the tank on the inboard side of the fuse?

How much engine off-set should I use?

Thanks,
Jim

Title: Re: More Brodak Guardian questions
Post by: Wayne J. Buran on October 23, 2012, 07:32:04 AM

Jim, I don't know if you are planning to use a slider or not but I use a standard Brodak offset pad, which seems to do the job for me. As for the tank size, 4 ounces will not be enough as you perfect your low speed performance. The position of the tank is your choice but if this is your first foray into profile carrier I would put the tank outboard until your skill sets improve. KISS is the word for starting out. Hope this helps.
Wayne

Title: Re: More Brodak Guardian questions
Post by: Jim Oliver on October 23, 2012, 08:21:28 AM

Wayne,
Thanks for the input-----it's my first carrier attempt.

No slider.  By "standard Brodak offset pad" do you mean the black plastic horseshoe shaped device? BH-849?

There seems to be too little room on the outboard side for even a 4 oz. tank.......unless the tank is mounted very high above the engine centerline (shouldn't be a problem for carrier, I suppose).

Title: Re: More Brodak Guardian questions
Post by: bill bischoff on October 23, 2012, 09:43:27 AM

The problem you will encounter with an inboard mounted tank is that the engine will go rich in the air because centrifugal force will want to sling the fuel towards the outside of the circle. Imagine if the tank was a foot above the engine-same idea. If you try to compensate with a lean needle setting, you will in all probability be too lean to get off the ground without quitting. (If you weren't trying to leap into the air at full throttle in 20 feet, you could gradually ease into the air and make it work.) If you look at pictures of carrier planes with big inboard tanks, you will see they also have a small tank on the outboard side. This tank is positioned to achieve proper fuel system geometry to make the engine happy, and the big tank feeds the little tank. This system has more potential for difficulty than a single tank, so I tend to avoid it. If it was properly vented, you could mount a typical 1" x2" x4" metal tank sideways through the fuselage between the engine bearers.

Title: Re: More Brodak Guardian questions
Post by: Wayne J. Buran on October 23, 2012, 10:38:46 AM

Picture for tank mount
Wayne

Title: Re: More Brodak Guardian questions
Post by: Wayne J. Buran on October 23, 2012, 10:44:08 AM

Picture

Title: Re: More Brodak Guardian questions
Post by: Jim Oliver on October 23, 2012, 10:57:53 AM

Bill, thanks for the tank info.  Understood.

Wayne, thanks for the pics---helps a lot.

Jim