is this a bad idea?

[dreamland s4]

is it a bad idea to add a wing on a cat? ive read a thread where this one guy that owns 3 expresscraft thundercats and stated that they tend to run wet. also, if you notice on the rear sides he has vents. i like them and was wondering if anybody knows where i can find them or how to make them. ideas are surely welcomed!

[Himalaya]

Nice thought. But I found my cat needs more down force at the nose when it reaches 80+mph, not at the transom. Different hulls might have diff characters though. But I've seen a a lot of cat stability problems at high speeds, all of them behave like their noses tends to go up when speed goes to a certain level, then soon within a blink of an eye they ended up with a brilliant fly dance in the air.

[Fluid]

Bad idea, that wing adds downforce exactly where it is NOT needed, plus a lot of unnecessary drag. The vents are for the gas engine and are available from several gas boat suppliers. Unfortunately he is not a very knowledgeable gas boater, he apparently does not have enough air inlet area to keep the motor supplied with cool air.

http://www.cc-racingengines.com/index.php?page=shop.product_details&flypage=flypage_images.tpl&product_id=268&category_id=17&option=com_virtuemart&Itemid=53

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[dreamland s4]

Bad idea, that wing adds downforce exactly where it is NOT needed, plus a lot of unnecessary drag. The vents are for the gas engine and are available from several gas boat suppliers. Unfortunately he is not a very knowledgeable gas boater, he apparently does not have enough air inlet area to keep the motor supplied with cool air.

http://www.cc-racingengines.com/index.php?page=shop.product_details&flypage=flypage_images.tpl&product_id=268&category_id=17&option=com_virtuemart&Itemid=53

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your absolutely right! well, the wing looks nice but ill pass on that! think i can add the vents on mines just for appearance? maybe i can seal it up from inside?

[dreamland s4]

Nice thought. But I found my cat needs more down force at the nose when it reaches 80+mph, not at the transom. Different hulls might have diff characters though. But I've seen a a lot of cat stability problems at high speeds, all of them behave like their noses tends to go up when speed goes to a certain level, then soon within a blink of an eye they ended up with a brilliant fly dance in the air.

80 mph? i assume you have a different model? yea looks nice but ill pass on the wing. also if it were to flip over it will screw things up. (even though u could add breakaway nylon screws)

[Himalaya]

80 mph? i assume you have a different model? yea looks nice but ill pass on the wing. also if it were to flip over it will screw things up. (even though u could add breakaway nylon screws)

140+km/h actually, yes, on another model. When I try to go faster I just can't stop my HPR115 from it's tendency of going flying.

I came up with a similar idea, to add a small slope at the nose. It will have nearly zero effect at low speed but will some downforce when speeds up. This is just an idea, haven't got a chance to give it a try yet.

[dreamland s4]

140+km/h actually, yes, on another model. When I try to go faster I just can't stop my HPR115 from it's tendency of going flying.

I came up with a similar idea, to add a small slope at the nose. It will have nearly zero effect at low speed but will some downforce when speeds up. This is just an idea, haven't got a chance to give it a try yet.

Hpr now ur talkin lol. Well, im hoping to reach at least 55 with a twin lepard 4082. This is going to be hard I think.

[Fluid]

I came up with a similar idea, to add a small slope at the nose

An easier and more effective solution is to use a tunnel air dam about 3-4" back of the nose. About 1/2" high, it disrupts the air in the tunnel and reduces lift. I had to use one plus some trim tabs at the back of the tunnel (to lift the stern) to get into the mid-80s with my SprintCat. It has a lot more lift than an HPR, etc.



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[Himalaya]

An easier and more effective solution is to use a tunnel air dam about 3-4" back of the nose. About 1/2" high, it disrupts the air in the tunnel and reduces lift. I had to use one plus some trim tabs at the back of the tunnel (to lift the stern) to get into the mid-80s with my SprintCat. It has a lot more lift than an HPR, etc.



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I thought the slope in my plan will make the hull look rather ugly, that's why I didn't apply it and was trying to find a better idea. Man you got my attention. Can I see how that looks like? Thanks.

[Rumdog]

Fluid's advice is spot on. He gave me the same for my Sprintcat. The airdam DOES work, and well.
I cut a piece of pool noodle square anf fitted it in the tunnel. However, it is unnecessary unless you're hauling some major butt. I'd run her first to see how she handles, and work with strut adjustments and props.

[dreamland s4]

An easier and more effective solution is to use a tunnel air dam about 3-4" back of the nose. About 1/2" high, it disrupts the air in the tunnel and reduces lift. I had to use one plus some trim tabs at the back of the tunnel (to lift the stern) to get into the mid-80s with my SprintCat. It has a lot more lift than an HPR, etc.



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will 2 outrunner 600 (heli) motors be a bad idea?

[Simon.O.]

will 2 outrunner 600 (heli) motors be a bad idea?

I run outrunner (OR) motors in my big cat and like them, they get hot but I do hard short runs so it works for me.
They can be fun but have their own issues for cooling (if needed).

fwiw I am in love with OR's for now, I run 3 hulls with them and will have 2 more on the water with OR power soon. I may be biased