Espritmodel.com Telemetry Radio
Reply
Thread Tools
Old Dec 19, 2010, 01:31 AM
Micro Boat Forum Founder
boredom.is.me's Avatar
United States, GA, Buford
Joined Nov 2007
6,496 Posts
Discussion
X-Craft: Not a plane but your help would be appreciated

This isn't a giant plane, but I figured that you guys would be able to lend some valuable advice on wiring and control.

Operation X-Craft: A Full Size Electric Hovercraft
http://www.rcgroups.com/forums/showthread.php?t=1356457

Thanks,
bim

I hope I am not breaking any rules.
boredom.is.me is offline Find More Posts by boredom.is.me
RCG Plus Member
Latest blog entry: RFD900 Case
Reply With Quote
Sign up now
to remove ads between posts
Old Dec 19, 2010, 07:40 AM
An itch?. Scratch build.
eflightray's Avatar
South Wales U.K.
Joined Mar 2003
13,000 Posts
I did a Google search on 'electric powered hovercraft', apart from the RC model ones, this link may give you some information - Electric Powered Hovercraft thread in a Hovercraft forum

The thread is 4 years old, but things haven't moved on that significantly since then, (unless of course money is no object).
eflightray is offline Find More Posts by eflightray
Reply With Quote
Old Dec 19, 2010, 09:55 AM
Micro Boat Forum Founder
boredom.is.me's Avatar
United States, GA, Buford
Joined Nov 2007
6,496 Posts
I read through the thread. They make it sound impossible and that you need WAY more power. Post #28 was great, but post #14 was the funniest.

He failed to mention the size of interest.
boredom.is.me is offline Find More Posts by boredom.is.me
RCG Plus Member
Last edited by boredom.is.me; Dec 19, 2010 at 10:01 AM.
Reply With Quote
Old Dec 19, 2010, 10:17 AM
Micro Boat Forum Founder
boredom.is.me's Avatar
United States, GA, Buford
Joined Nov 2007
6,496 Posts
Oh and money is definitely an object. I have a general estimate of around $1,100 plus may be a few scraps. To solve the money problem, I'm not going to tackle it all at once. The hull comes first. That will only cost about $125. Then the skirt, approx. $125. Then the first half of electronics, which includes batteries, motors, and ESCs.
boredom.is.me is offline Find More Posts by boredom.is.me
RCG Plus Member
Latest blog entry: RFD900 Case
Reply With Quote
Old Dec 19, 2010, 11:14 AM
Registered User
USA, SC, Easley
Joined Sep 2009
481 Posts
Do you have any idea what kind or power you will need? Watts or maybe hp, that way you may get better information about what might work.
yellowbird2800 is offline Find More Posts by yellowbird2800
Reply With Quote
Old Dec 19, 2010, 11:40 AM
Micro Boat Forum Founder
boredom.is.me's Avatar
United States, GA, Buford
Joined Nov 2007
6,496 Posts
I am basing the power requirements off of the UH-10F.


UH-10F Specifications
Capacity - 1 Person
Payload - Up to 250 Lbs
Speed - 25 to 35 mph
Hover Height - 8 inches
Length - 10 ft
Width - 5 ft
Empty Weight - 140 to 170 Lbs
Flotation - 600 Lbs
Climb Gradient - 10 to 20%
Engine - 8-15 hp horizontal shaft (under 65 Lbs)
Construction Method - Foam and Plywood Composite
Construction Time - 40 to 100 hours

X-Craft Specifications
Capacity - 1 Person
Payload - striving for 175 Lbs
Speed - striving for 25 mph
Hover Height - 6 inches
Length - 8 ft without skirt, 9 ft 2 in with skirt
Width - 4 ft without skirt, 5 ft 2 in with skirt
Empty Weight - striving to keep it below 100 Lbs
Flotation - striving for 400 Lbs
Climb Gradient - IDK
Engine - Twin 7000W bl motors
Construction Method - Foam
Construction Time - IDK
boredom.is.me is offline Find More Posts by boredom.is.me
RCG Plus Member
Last edited by boredom.is.me; Dec 19, 2010 at 12:00 PM.
Reply With Quote
Old Dec 19, 2010, 01:39 PM
An itch?. Scratch build.
eflightray's Avatar
South Wales U.K.
Joined Mar 2003
13,000 Posts
Assuming 7000watts are required.

Calculate the current required, (I = W/V). Then calculate the battery capacity (assuming only 80% used to prolong Lipo life), for say 15 minutes of running time, (which isn't long to have fun).

You would then either need a spare pack to go again or a large power supply to re-charge the used pack.

You could build one and make it work, but.........for how long ?
eflightray is offline Find More Posts by eflightray
Reply With Quote
Old Dec 19, 2010, 02:39 PM
Micro Boat Forum Founder
boredom.is.me's Avatar
United States, GA, Buford
Joined Nov 2007
6,496 Posts
I = 140a, but I will not be drawing that much per motor. ... 5.8ah battery
Please correct me if my math is wrong.

A x H = AH (capacity)
H = AH/A

80(2) x H = 5.8
H = 0.03625
.03625 x 60 (min) = 2.175 minutes

That isn't much, but the batteries are not heavy, so I can always just add more at a cost of $137.16.
S = amount of battery pairs
137.16 x S = 2.175 x S = cost for a given time

I like math...

This is from the other thread.
Quote:
Originally Posted by boredom.is.me View Post
I have plans for the power if things don't workout as planned. The 180kv motor puts out 7000W. That is equivalent to 9.387hp. But lets consider that as being optimistic and drop the hp down to 7. The remaining 2.387hp will be safety. Going off of that, There should be enough power to easily get the craft 6" off of the ground.

A UH-10F is around the same size, but has an 8" hover height and weighs 140-170lbs. Specs say a 8-15hp engine that weighs less than 65lbs. You also need fuel.

- The little motor I'm looking at only weighs 1570g which is 3.461lbs. Two of those make 7lbs.
-The batteries taken into consideration weigh 838 grams which is 1.847lbs. Two of those make 4lbs.
- The ESCs only weight 125g which is .276lbs. Two of those make .6lbs.
Note that I added to the weights when I made my estimate. This should accomidate for associated wiring.

So the entire motor and energy package only weighs 11.6lbs. Wow, that is an entire 50lbs less already! Total amp draw will be about 150-190amps, maybe even less.
boredom.is.me is offline Find More Posts by boredom.is.me
RCG Plus Member
Last edited by boredom.is.me; Dec 19, 2010 at 02:47 PM.
Reply With Quote
Old Dec 20, 2010, 01:32 AM
Registered User
Dino2010's Avatar
dhaka
Joined Dec 2010
78 Posts
USNS “X-Craft” built as a catamaran with decreased water-plane area shows some. But conventional SWA ships (with circular frames of gondolas) are not





______________
Wholesale Android Phones
Dino2010 is offline Find More Posts by Dino2010
Last edited by Dino2010; Dec 29, 2010 at 12:09 PM.
Reply With Quote
Old Dec 20, 2010, 04:59 AM
Micro Boat Forum Founder
boredom.is.me's Avatar
United States, GA, Buford
Joined Nov 2007
6,496 Posts
???
boredom.is.me is offline Find More Posts by boredom.is.me
RCG Plus Member
Latest blog entry: RFD900 Case
Reply With Quote
Old Dec 21, 2010, 03:54 PM
If in doubt, add accelerant
Lberry.88's Avatar
United Kingdom, England, Stansted Mountfitchet
Joined May 2007
1,825 Posts
Quote:
Originally Posted by boredom.is.me View Post
???
Ditto, he has been appearing elsewhere with random comments.
Lberry.88 is offline Find More Posts by Lberry.88
Reply With Quote
Old Dec 21, 2010, 09:51 PM
Micro Boat Forum Founder
boredom.is.me's Avatar
United States, GA, Buford
Joined Nov 2007
6,496 Posts
Not completely random here, but completely irrelevant. X-craft stands for experimental craft, and at the time (not sure about now) that ship was an x-craft. It most likely has been given a designation.
I'm on vacation (unfortunately) and won't be back till the 10th.
boredom.is.me is offline Find More Posts by boredom.is.me
RCG Plus Member
Latest blog entry: RFD900 Case
Reply With Quote
Old Dec 23, 2010, 06:52 PM
Micro Boat Forum Founder
boredom.is.me's Avatar
United States, GA, Buford
Joined Nov 2007
6,496 Posts
Would these connectors be capable of the amp requirement?
Female: http://www.hobbyking.com/hobbyking/s...idproduct=5487
Male: http://www.hobbyking.com/hobbyking/s...idProduct=5488

I like the fact that they are cased, plus I hate soldering bullets.
boredom.is.me is offline Find More Posts by boredom.is.me
RCG Plus Member
Latest blog entry: RFD900 Case
Reply With Quote
Old Dec 24, 2010, 10:26 PM
Micro Boat Forum Founder
boredom.is.me's Avatar
United States, GA, Buford
Joined Nov 2007
6,496 Posts
Quote:
Originally Posted by boredom.is.me View Post
Would these connectors be capable of the amp requirement?
Female: http://www.hobbyking.com/hobbyking/s...idproduct=5487
Male: http://www.hobbyking.com/hobbyking/s...idProduct=5488

I like the fact that they are cased, plus I hate soldering bullets.
Here is an idea, but I want some opinions.

The motors have a dual shaft output. Can I put a 18x6 or 18x8 on top and a 18x8/10/12 on the bottom?

I found that the motor can spin a 24x6 on 12s within the limits of a 100a esc, and that it can handle a 24x13. I even saw a 28x12 on 10s.

But if the 18xP are still too big, I saw 16x6, 16x7, 16x8, 16x10.
boredom.is.me is offline Find More Posts by boredom.is.me
RCG Plus Member
Latest blog entry: RFD900 Case
Reply With Quote
Old Dec 30, 2010, 03:16 PM
Micro Boat Forum Founder
boredom.is.me's Avatar
United States, GA, Buford
Joined Nov 2007
6,496 Posts
Might anyone know where to get m2 nylon (or any other type of plastic) nuts and bolts. I've searched my head off, without any real results.

I found a place... finally.
boredom.is.me is offline Find More Posts by boredom.is.me
RCG Plus Member
Last edited by boredom.is.me; Dec 30, 2010 at 05:04 PM.
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Question Would you or would you not expect a charger and battery to be included with a RTF? ah19 Trader Talk 9 Dec 16, 2010 07:40 PM
Mini-HowTo I know its not a pylon racer, but I figured you guys would be the best ones to help.. Mchone, Jake Pylon Racing 6 May 03, 2010 12:02 AM
Discussion Camera selection! Any help would be appreciated! GOK Aerial Photography 9 Sep 19, 2006 05:49 PM
Discussion Help With Problem Would Be Appreciated Charliet Coaxial Helicopters 3 Apr 09, 2006 11:12 AM
Discussion Hydroflyer help would be appreciated here. kushy04 Foamies (Kits) 19 Mar 05, 2006 08:26 PM