Giveaway: refer the most builders by October 30 and win your pick from the store. How it works
boatbuildlog

Tiny Titan · new build

Glen L Tiny Titan Hydroplane

by Matt · Texas · Message Matt

Building a small hydroplane for the kids to learn some basic boating skills on a fun boat!

Make a book Feed The whole log, 29 entries and every photo, laid out as a book to print, bind and keep.
29
Entries
52
Hours
41
Days elapsed
147
Photos
Spent
Aug 2026
Started
Systems 1.5 h Link

I got the new Mercury 2 stroke outboard in today, and im very excited about it. Haha just kidding, its a Hangkai. Honestly, I have seen pretty good reviews for this brand, so I will give it a chance. They say its a clone of the Tohatsu M5B.

I built the motor stand with some wood I had laying around and fired up the outboard, it started with just a few pulls. I have been running it for about an hour and it seems like it's running fine. I had to adjust the idle, other than that seems like a decent engine.

Fairing & Sanding 2 h Link

Build Log: Power Tools and First Fiberglass

Sanding Day

Today I finally started using some of the power tools.

I took the boat outside and used the belt sander to knock off a lot of the rough edges. I evened up the coamings on both sides and did my best to even up the transom, since there was about a quarter inch gap on one side.

My 5" orbital sander was acting weird, so I tossed it and went and bought a DeWalt. This one should last me 20 to 30 years. I also picked up a bunch of 50 and 80 grit paper for both the orbital and the belt sander. I knew I had to move a lot of wood, and that's the lowest grit I feel comfortable with.

Fiberglass Taping

Once I felt pretty good about the sanding, I blew everything out, cleaned up the inside, and brought the boat back into the garage to start on some of the fiberglass taping.

Here's what got glassed today:

  • Side panels from the transom to the dashboard
  • Side panels to the transom
  • Both frames in various places

Anywhere there wasn't a nicely rounded surface, I added a very liquidy wood flour epoxy first. The idea is that glass doesn't bond well to sharp, straight edges and won't add much strength there. If you round those edges over with thickened epoxy, the glass adheres much better. This has worked on my past boats, and it looks like it's working on this one too.

Texas heat tip: Since it's still very hot here, I portioned out just the epoxy into separate cups and put them in the fridge for a couple of hours. It's an old trick we use here in Texas to buy an extra 10 to 15 minutes of working time.

What's Next

I still have 20 or 30 feet of fiberglass left, so I'll probably schedule another day to glass more joints. I have to epoxy the entire inside anyway before I start covering the boat.

Glassing & Epoxy 1 h Link

Starting to epoxy the interior, it's getting a bit hot in the garage so I'll stop for today. We have some more surfaces but probably I am about 70% done.

Fairing & Sanding 1.5 h Link

I did a light sanding today in preparation for the second coat of epoxy, I will try and get it in tomorrow before the rains. If I have time I might start to try and cut the top panels as well.

What it cost

$1,951.00
$1,522.00
Into the boat
$429.00
Tools & gear
ItemQtySupplierCost
Boat Plans 1 Glen-L $75.00
Plug in jigsaw 1 Ryobi $100.00
lumber 1 Home Depot $100.00
Fir AB Marine 1/4" 4x8 2 Plywood company $200.00
Fir AB Marine 1/2" 4x8 1 Plywood company $137.00
Birch 1/8 4x8 Plywood 1 Plywood company $35.00
Craftsman planer 1 Craftsman $329.00
Fasteners and Fiberglass kit 1 Glen-L $400.00
6HP 2 Stroke Hangkai Outboard Engine 1 Hangkai $575.00