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Search: Posts Made By: du-groundeffect
Showing results 1 to 23 of 23
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Forum: RC Airboats
02-28-2004, 10:46 PM
Replies: 86
Views: 8,482
Posted By du-groundeffect

RE: RE: RE: Airboat Challenge

Haljmac,

I'm guessing it tried to submarine...am I right? Could be you need more bouyancy up front or CG farther back so it will behave well enough to get on plane...Otherwise, a toss launch...
Forum: RC Airboats
02-28-2004, 04:39 AM
Replies: 86
Views: 8,482
Posted By du-groundeffect

RE: RE: Airboat Challenge

Hi Bill,

Nice to see your post here! My son and I do remember meeting you at the Puyallup Expo one year. That must have been the year we were showing some video clips of our ground effect...
Forum: RC Airboats
02-26-2004, 01:06 AM
Replies: 3
Views: 1,219
Posted By du-groundeffect

RE: WIG boat

Hey Hover Dude,

Who says a WIG craft is not an airboat? (Define "airboat"...) It's just another family of the same basic breed! So it has wings, and therefore more difficult to balance to...
Forum: RC Airboats
02-25-2004, 11:57 PM
Replies: 86
Views: 8,482
Posted By du-groundeffect

RE: RE: Airboat Challenge

Pro,

That "false bottom" under the prop probably helps prevent water spray from being sucked up by the prop during take-off. It also probably serves as a planing foil to help lift the front at...
Forum: RC Airboats
02-25-2004, 11:49 PM
Replies: 86
Views: 8,482
Posted By du-groundeffect

RE: RE: Airboat Challenge

Looks like a fun project, haljmac! I'm wondering, though, if you will have trouble with the prop picking up spray if it's too close to the surface. I once built a similar model with a Fox .35...
Forum: RC Airboats
02-23-2004, 09:36 AM
Replies: 86
Views: 8,482
Posted By du-groundeffect

RE: Airboat Challenge

Hi guys,

I totaly agree with the sentiment that the main goal is to have fun, and the beauty of airboats is that you don't have to conform to any pre-determined rules about shape, size, engine,...
Forum: RC Airboats
02-22-2004, 01:36 PM
Replies: 86
Views: 8,482
Posted By du-groundeffect

RE: Airboat Challenge

pro27,

Thanks for posting the namba records. Several of them look like interesting "targets", such as the A, B, C, X, and Unlimited Hydro. Anyone that builds an airboat that comes close to...
Forum: RC Airboats
02-22-2004, 01:12 PM
Replies: 86
Views: 8,482
Posted By du-groundeffect

RE: Airboat Challenge

Hi Brother,

My website address is http://www.du-groundeffect.com There are some links to other sites that you may find interesting too. We have some video clips of some of our test runs. ...
Forum: RC Airboats
02-21-2004, 06:11 PM
Replies: 86
Views: 8,482
Posted By du-groundeffect

RE: Airboat Challenge

Like I mentioned before, water drag can be essentially eliminated if you make use of ram air pressure, and "fly" just above the surface. Full-size experimental craft are classified as "boats" as...
Forum: RC Airboats
02-21-2004, 06:05 PM
Replies: 86
Views: 8,482
Posted By du-groundeffect

RE: Airboat Challenge

Hi brother,

What you saw could have been the Klem Outrider 27 which rides on an air cushion and uses a surface drive, or possibly the Flarecraft L-325 which uses an air prop and is a true "WIG"...
Forum: RC Airboats
02-21-2004, 05:48 PM
Replies: 86
Views: 8,482
Posted By du-groundeffect

RE: Airboat Challenge

Hi Pro,

I agree, Master Airscrew is not known for speed performance; APC would be a better choice. APC makes a 9x6 three blade, which might be about right for the Rossi .61. I have a rear...
Forum: RC Airboats
02-19-2004, 01:43 AM
Replies: 5
Views: 685
Posted By du-groundeffect

RE: Poll : To flip or spin ? Which one do YOU do ?

Well Turbo, I'll have to agree with Pro that it depends on what you're trying to start. I've done a lot of hand starting, always with a glove, on engines up to size .40. My experiences started out...
Forum: RC Airboats
02-19-2004, 01:28 AM
Replies: 86
Views: 8,482
Posted By du-groundeffect

RE: Airboat Challenge

Yes, those ducted fan units are expensive, all right. As an alternative, you might consider if a three blade prop of say 9" dia. and around 8" pitch would work on your engine. It would be cheap...
Forum: RC Airboats
02-16-2004, 10:36 PM
Replies: 86
Views: 8,482
Posted By du-groundeffect

RE: Airboat Challenge

Most ducted fans are made for engines in the .60 to .90 size range, commonly used in jet aircraft models. Those engines usually run around 20,000 to 25,000 rpm. On the smaller size, OS makes a .46...
Forum: RC Airboats
02-16-2004, 01:19 PM
Replies: 86
Views: 8,482
Posted By du-groundeffect

RE: Airboat Challenge

Hey haljmac, that is some Rossi .61! I can imagine the engine might hold together at over 30,000 rpm, but what about maximum power? If you were going to try an run a prop at that speed I'm sure you...
Forum: RC Airboats
02-15-2004, 08:51 PM
Replies: 86
Views: 8,482
Posted By du-groundeffect

RE: Airboat Challenge

Hi Bsmooth,

As to what types of craft qualify as "airboats", I agree with pro27; anything driven by an air propeller is an airboat. As different craft emerge, and especially if there were a lot...
Forum: RC Airboats
02-15-2004, 01:10 PM
Replies: 86
Views: 8,482
Posted By du-groundeffect

RE: Airboat Challenge

Hi haljmac,

What I had in mind was to make a point that for a given engine size you could go faster with an air driven craft than with a water prop. Certainly the water prop records would not...
Forum: RC Airboats
02-14-2004, 04:41 PM
Replies: 86
Views: 8,482
Posted By du-groundeffect

Airboat Challenge

Hey guys, why not adopt the attitude that the "lowly" airboat can go faster than a regular hydro? That roostertail may look impressive, but it represents a lot of wasted energy! How about an...
Forum: RC Airboats
02-12-2004, 11:34 PM
Replies: 12
Views: 936
Posted By du-groundeffect

RE: Airboat Competition?

Thanks everybody, for your response to the topic of competition! I kind of suspected that there was no formal "recognized" airboat competition. As Slayer mentioned, "pure" boat clubs are pretty...
Forum: RC Airboats
02-11-2004, 11:36 PM
Replies: 12
Views: 936
Posted By du-groundeffect

Airboat Competition?

I was wondering, does anyone know of any sanctioned racing for airboats? If so, where is it done, or who is the sanctioning organization? Some sort of competition would do a lot to encourage...
Forum: RC Airboats
02-08-2004, 02:44 PM
Replies: 13
Views: 1,283
Posted By du-groundeffect

RE: porpoising? Any one have this trouble?

Hi Pro27,

There are a few sites around dealing with ground effect boats, these days termed "WIG", including our own at http://www.du-groundeffect.com
We've had a lot of fun working with...
Forum: RC Airboats
02-08-2004, 01:57 PM
Replies: 10
Views: 1,115
Posted By du-groundeffect

RE: Electric Air boat

Hi TERBObob,

Thanks for the link to Marty's site. He bought one of our "Wiggy" kits a while ago, and it was good to see the construction photos he posted. The model is a stable "flyer", and a...
Forum: RC Airboats
02-06-2004, 01:00 PM
Replies: 13
Views: 1,283
Posted By du-groundeffect

RE: porpoising? Any one have this trouble?

Hi Bsmooth,

That porpoising is a nuisance, all right. In flat bottom boats it often indicates a slight hook in the bottom near the transom, or wherever it makes water contact. And certainly,...
Showing results 1 to 23 of 23


 
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