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Feb 25, 2013, 07:44 PM
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viper1's Avatar
Build Log

Hornet Formula-1 Tunnel Hull, The perfect Upgrades ??

Big call....Is there such thing as the perfect upgrade? I think not, and you probably won’t hear it from me.
When it comes to FE boats I’m just a rookie but given my background in scale aircraft modeling I don’t mind modifying my new ‘not-so-perfect’ toys straight out of the box. Actually I enjoy it as much as playing with them.
That’s one of the reasons I got his boat, a challenge to make it better.

I always wanted a F1 tunnel hull. There are way better hulls and kits out there with higher price tags. And arguably in the long run could even be cheaper then modding a boat straight out the box. But hey, where’s the fun in that?

I will cover the hull modifications and drive upgrade(s), and keep useful changes and updates in the first pages in this thread if possible for easy reference.
Hopefully this will become a good info source, centralized in one place, to save prospective owners from browsing all over the net for hours.

There is enough info spread among different forums of the shortcomings and flaws of the standard equipment this boat comes with out-of-the-box but I will cover these as the build comes along.

EDIT: here is the before and after (tricked photo),

for more pics of the end result skip straight to this post:
Last edited by viper1; Jun 03, 2013 at 11:33 PM.
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Feb 25, 2013, 07:45 PM
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1) Reliability: covering hull reinforcement, installed equipment and outboard upgrade.
2) Speed: for now 45-50 Mph -70 Km/Hr would be nice….. we’ll see
3) Looks: Have you ‘read’ the stickers on this boat ??

Plans so far in my wicked mind to achieve that;

A) Carbon fiber on the hull bottom in center section (radio box)
B) Transom reinforcement, Aluminium Edit: Carbon sheet used
C) Make a proper radio box with good seal, easy accessible.
D) Make a scale looking outboard cover for the motor that’s also water-proof, I don’t like the idea of a motor submerged in water after a flip.
EDIT: A lot less complicated in the end was to make the motor waterproof and just let the outboard flood with a mishap, As the motor is a inrunner this was easier. A large drain hole in the outboard cover, and servicing is a lot easier now than sealing everything up.

Installation in the planning so far:

ESC : Turnigy Marine/Seaking-120A

Motor: Turnigy SK3 Fandrive - 3659-1900kv (This was the initial installation in my Genesis Offshore, good for 100Km/hr on 6s. Great motor but not tested on lower cell-count.

Outboard: Either O.S. Lower leg, or Hyper Performance 3.5 Bullet Outboard. Both are on order (don’t ask…) will decide what suits better when they are here.

EDIT: After having both units on my desk, the decision leaned towards the O.S. unit, better quality and with potential future changes of hulls in mind, I find this to be the overall better unit.
Last edited by viper1; Jul 11, 2015 at 02:37 AM.
Feb 25, 2013, 07:45 PM
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Take off !

Box contents:

Removed the R–clips studs > support the Fiberglass and a slight tap with a hammer they pop right out.

Also removed the battery tray (lifted right out putting my pinky under it…so much for gluing)
The light-ply at the transom is also removed, used a dremel to clean up.
Now we have something to work with, so to speak.

Note that glue is not removed yet in the photo.

Last edited by viper1; Feb 27, 2013 at 05:08 PM.
Feb 25, 2013, 07:46 PM
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Don't Split....

Although the fiberglass doesn’t look bad, keeping the price in mind, close inspection of the seam between hull and deck showed some gaps on inside.
I poured some laminating epoxy resin in and let it run along the seam, one side at a time (let it harden in between)
Hard to photograph using a mirror, but you’ll get the idea.
As the sponsons won’t be accessible later it’s a good time to do it now. Maybe not necessary but better for my piece o’ mind

Last edited by viper1; Jun 01, 2013 at 12:44 AM.
Feb 25, 2013, 07:47 PM
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New Carpet ....

Added some carbon fibre on hull bottom about 4” / 10cm wide, not worried about the edges, next step will be closing off the sponsons so this will not be visible. In hindsight I could have used a finer weave CF cloth, this is not the neatest job I’ve ever done.

Also put a layer against the transom.

Last edited by viper1; Jun 01, 2013 at 12:44 AM.
Feb 25, 2013, 07:50 PM
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Reserved for more pics...
Feb 27, 2013, 08:57 AM
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Simoc's Avatar
Hi Viper 1. I'm having great fun with mine but using the heli motor with 6s. I've been told 4s will give you 80kph with the Fandrive and controlling it is fun at that speed. You need to keep the front down somehow.
Feb 27, 2013, 11:48 AM
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Originally Posted by Simoc
Hi Viper 1. I'm having great fun with mine but using the heli motor with 6s. I've been told 4s will give you 80kph with the Fandrive and controlling it is fun at that speed. You need to keep the front down somehow.
'The' heli motor ? is that an outrunner?

Been told ? or seen it?
If they run 80 k's with 1900kv on 4s, they must be running a 47 mm prop or more, I would like to see that first on this hull before I would spread the gospel....

The speed estimate tool on OSE is a good tool to get a rough idea for speeds and setup.
Last edited by viper1; Feb 27, 2013 at 05:03 PM.
Feb 27, 2013, 05:04 PM
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From light plywood I cut the following shapes, they function as side walls for the radio box, closing off the sponsons at the same time.

Before gluing them in, I waterproofed them with epoxy resin on both sides.

Last edited by viper1; Jun 01, 2013 at 12:45 AM.
Feb 27, 2013, 08:10 PM
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Amp Abuser's Avatar
Hornet F1 Tunnel hull mods and test runs (9 min 22 sec)

Here is a 1,600W upgrade info with running footage for idea's
Feb 28, 2013, 10:51 AM
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paultbg's Avatar
As always with that particular guy, he put a lot of power and no brain at all...I will be ashamed to show that kind of trimming / driving.Even worst, the beginners are following his advices....
Mar 01, 2013, 01:57 AM
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viper1's Avatar
Nobody's perfect Paul,

I took -some- advice from him and I don't regret it. True, anybody with a brain should be selective on what you take for advice and what not. Specially on the net.
I'm not following anyone blindly, but in the few things I did ask Frank he was quickly and helpfull with his reply. And yes he shows his 'misses' as well. And shows in follow-ups what he did wrong and how to fix it.
Unlike some self acclaimed specialists, that are hiding their mistakes, for me that makes him just human.

Just like your (Genesis) on-board videos, I'm always thankfull for anyone who makes the effort to make a clip.

Just my 2 cts

I'm just jealous because I lost my gopro in a genesis tumble months ago, and I'm still not over it...
Mar 01, 2013, 04:42 AM
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Simoc's Avatar
Well since you follow him Viper you should know that he is the one who used the Fandrive on the Apparition and followed up with advice on the Hornet. And what does Paulbg bring to the table. Absolutely nothing. Critism is so easy for vacant humans.
Mar 01, 2013, 04:45 AM
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Simoc's Avatar
And I'll follow that up Paulbg. Show us what you can do since you reckon you know. Otherwise it is apparent you're an imposter. Reckon you are not a beginner. Well you sound like one.
Mar 01, 2013, 05:35 AM
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viper1's Avatar
OK, this is a build log, BACK TO TOPIC !

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