View Full Version : Alternative engines

smert - n/a
13-Sep-06, 10:32 AM
Hi All,

I am in the process of building a challenger craft (from the Constructors guide and I have a RD350 engine that I have hoverised. However, I am seriously struggling to get the engine to work, so I'm thinking about replacing it altogether.

So, what are my alternatives? TZR250 or ...?

I am not interested in racing (to far away from any races), just messing about on private land / local estuary.



Sean Atterbury - n/a
13-Sep-06, 12:10 PM
I have ended up using a Rotax 503 in mine.

I made the mistake of trying several different engines before at last biting the bullet and getting a rotax.

I however am not of the most tallented people and so have ample power, however if you have tallent, not like myself then a smaller engine may work for you.

It did'nt work for me though.

Use it or not, in the end it's you who has to live with the craft you buildt.

PS: this is'nt sposed to sound offensive, if it does, sorrrry. http://hovercraft.org.uk/images/icons/smiley_icons/icon_biggrin.gif

jon_curtis - n/a
13-Sep-06, 04:20 PM
the hull your building is not best suited to the estuary. i wouldnt go out in my challenger based craft, on open water in anything other than a perfect still calm day with still water!

how far on with the build are you? you may still beable to increase the free board, or lift the fan so you have 300mm from the bottom of the inside of the duct to the floor.

saying that tho, you will have a lot of fun in it, which is the main thing, then maybe build something bigger?

wouldnt go for a tzr if your going out on the estuary, would not even consider it, very loud and temprimental, very much so in a salt water environment!

how much power is there in a rd350? what size duct have you got? ideally, you want a light four stroke engine. but not a tzr, not for where you wana use it.

smert - n/a
13-Sep-06, 08:11 PM
To be honest the estuary idea is more likely to be the mudflats as opposed to open water, but point taken.

At the moment, I have a hull and not a lot else. I haven't a clue how much power the RD engine should produce but right now it's getting 0hp from 0rpm so...!

Sean Atterbury - n/a
14-Sep-06, 07:22 AM
I'll agree with danger on the point about open water, on this last trip the wind picked up and made some waves,

http://hovercraft.org.uk/images/icons/smiley_icons/icon_lol.gif http://hovercraft.org.uk/images/icons/smiley_icons/icon_lol.gif http://hovercraft.org.uk/images/icons/smiley_icons/icon_lol.gif

Now that was fun, and the craft is not as cumfie on the rough stuff. Plough in is also common then. Maybe if the sides of the hull were of a lesser angle then things would be better, but as the plans stand, not good on the rough stuff.

But again, a lot of fun. http://hovercraft.org.uk/images/icons/smiley_icons/icon_lol.gif http://hovercraft.org.uk/images/icons/smiley_icons/icon_lol.gif http://hovercraft.org.uk/images/icons/smiley_icons/icon_lol.gif

Had a pic of the conditions but seems have got lost when PC was formatted. OH well, next time.