Recent Posts

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For Sale & Wanted / Re: Sevtec Surveyor for sale
« Last post by Ian Brooks on Oct 27, 2025, 11:17 pm »
That’s a shame indeed. I can attest to the quality of the build, I was down there a couple of months ago when it was nearly finished. I hope someone keen buys it and has fun.
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For Sale & Wanted / Re: Sevtec Surveyor for sale
« Last post by Eric Yeoman on Oct 27, 2025, 9:38 pm »
Hi, that's a shame for sure. I reckon she'll be snapped up. I noticed how quiet that engine is. Is that muffler one of the S. Steel, diesel type. I've seen similar on eBay & I'm looking around as the original one is way too heavy. Thanks & cheers from Oz.
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For Sale & Wanted / Sevtec Surveyor for sale
« Last post by Gaz on Oct 27, 2025, 3:29 pm »
Here it is... The post I feared I'd have to write!


FOR SALE

The Sevtec Surveyor built for 1387 (Liskeard) Squadron Air Cadets.


This craft, 7 years in the building, is now for sale due to the Air Cadet top brass now being so "Risk Averse" they wont let the cadets use it!


Most of the build can be followed here;
https://hoverclub.org.uk/index.php/topic,6489.100.html
There are quite a few gaps as I couldn't get anyone to sign up to the forum and update the posts.


Here's a quick video of its first proper test flight;



https://youtu.be/RaHh-12j5ms



The craft is powered by a Briggs and Stratton vanguard EFI engine. 600mm Hasconwing 4Z lift fan and a 72" Ultralight Propellor. It comes with a custom built trailer that has undergone trailer testing.


It's built mostly to the plans with only the upper deck undergoing any customisation. It is in the Air Cadets livery as it stands, the stickers are all self adhesive vinyl and can be removed


Selling on behalf of 1387 Squadron. All profits from the sale will go back into the squadrons Civilian Committee's Cadet Welfare Fund bank account for the benefit of the cadets.


£8000 or sensible offers




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HovTube / Re: Clip from last visit to Loch fyne
« Last post by Steve Holland on Oct 27, 2025, 10:32 am »
Al, those were exceptional conditions, the video doesn't do it justice. Normal minimum rpm for me is around 2,450. Plough in isn't something I think about although the new skirt is marginally more likely to do it albeit relatively. The front end dipped excessively on launch from the log house, reducing the size of the triangular fill ports has improved that significantly.
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HovTube / Re: Clip from last visit to Loch fyne
« Last post by Al on Oct 26, 2025, 12:01 pm »
Nice to see your speed and engine RPM.  Shows that you don't have to keep the RPM up at maximum to cruise or to stop the craft ploughing in.
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HovTube / Clip from last visit to Loch fyne
« Last post by Steve Holland on Oct 26, 2025, 9:23 am »

https://youtu.be/rNCVIuVa_D4

This should have been in the last video, it shows how nice the conditions for being out on the water were.
My video taking and editing will improve!
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General / Re: Lift problems again
« Last post by Al on Oct 24, 2025, 7:06 pm »
I think the thrust belts are made to look worse through the camera than they are. Not sure why, unless it’s something to do with the propeller blades messing with the camera sensor. I checked with the belt calculator and they should be 9.1 mm offset at 2.6kg. I set the belts at that and they feel pretty tight
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General / Re: Lift problems again
« Last post by John Robertson on Oct 24, 2025, 4:21 pm »
Hope you've also checked the thrust belts as they are also flapping around - calculate the tension properly.  Kohler 40 idle rpm should be 1200 min. - don't set it below this as it has (in common with Briggs) slinger/splash lubrication for the heads/piston (too low an idle speed can overheat the engine).
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General / Re: Lift problems again
« Last post by Al on Oct 24, 2025, 12:59 pm »
All back together :)


Video of it running at 1500 RPM.  You can see hover is trying to lift at this point.



https://youtu.be/tEe9TXXVLXc






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HovTube / Re: Severn Heavern Hovercraft Cruising
« Last post by Ian Brooks on Oct 23, 2025, 9:29 pm »
Nice! T’was a great few days  :D
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