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Old 04-13-2007, 11:10 AM   #1
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Unionville 6' Beaver question-start a new thread

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Well after taking some time off after Xmas, I started working away on my Unionville 6' Beaver again and have some questions if someone can help me.

1) I finished mounting the engine mount and have fastened the firewall to the fuselage. As I mentioned in my first post, I plan on using my Supertigre 45 on the plan. Most of you probably know the stock muffler on this engine is pretty big and would stick out the side of the cowl. Since I want to make the plane as realistic as possible, I have looked at a Pitts style muffler so that the exhaust stacks protrude out the bottom of the cowl. If I go this route, can the muffler be mounted on the bottom of the firewall? If so, how do I route the exhaust from the side of the engine (assuming it is mounted upright) around and down to the muffler? Is there such a thing as flexible exhaust pipe? Or do I have to mount the engine sideways?

2) The plans call for bellcranks and pushrods in the wing for the flaps and ailerons. The owner of the hobby store suggested for the ailerons, I should mount individual servos on the outboard end of the wing. For the flaps, to make a groove in the leading edge of each, epoxy some wire in, link them together by brazing them I guess and have one servo under the center of the wing pushing and pulling the wire. Am I on the right track here? I have already picked up some extra servos at the Whitby swap meet just past so I'm good to go this way.

Thanks for your input.
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Old 04-13-2007, 11:56 AM   #2
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If you want to use a Pitts style muffler you will need to mount the engine sideways. Almost all engines will run fine this way. Bisson offers upright mufflers that will fit inside the cowl if you want an upright installation.

The wing on the Beaver is very thin, ie not much room for full size servos. Hitec HS81 servos will fit into the wing just fine and have plenty of power for this application. I used 4 of them, 2 for ailerons and 2 for flaps on my Otter, which has basically the same wing as the Beaver from Unionville.


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Old 04-13-2007, 05:26 PM   #3
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Go with Servos in the wing, Way Better

Same as Jolli said, I use 4 in my Otter wing too (same wing as the Beaver )... I used HS-81's and HS-85's .. You can use either (I just had 2 85's so I used them too)... Just remmeber to build a tube in the wing ribs to run the servo leads through.. Plus I mounted mine to a plate that screws to the bottom of the wing... This way, just makes it a bit easier to mount the servos on there side..
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Darren loves Floatplanes and dirt bikes
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Old 04-18-2007, 10:43 AM   #4
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Thank you both for your comments. The pictures you included are most helpful Darren.
I managed to rotate the engine mount 90 degrees to the side without having to redrill new holes and I will keep my eyes out for 4 HS81/85's in the For Sale section here. The JR537's that I was going to use would stick out quite a bit from the wing.
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