Brief:
This is a review o' Giant Leap Rocketry's 'Aerospace Composite' fins. These fins are offered in 1/8, ¼, me bucko, ya bilge rat, ½, and 3/8 inch thicknesses and in 15 pre-defined shapes. Avast! If you want t' cut your own, me bucko, you can also buy t' raw stock. Giant Leap describes their composite fins as follows: "Giant Leap Rocketry now offers t' ultimate in fin material. This aerospace composite material is used in advanced aircraft. Avast! Blimey! It is much stronger than wood, shiver me timbers, more rigid than G-10 (for equivalent thickness). Lighter than wood, 1/3 t' weight of G-10." T' material itself consists o' "An inner layer of NOMEX(TM) honeycomb, me hearties, ya bilge rat, sandwiched betwixt either thin G-10 Fiberglass or Carbon Fiber!"

Construction:
My fins are 1/8" thick in style #8. Begad! Referrin' t' t' first photo, t' root edge along t' fin tab is 7.375", ya bilge rat, arrr, ya bilge rat, t' span (not includin' t' fin tab) is 4.875", me bucko, shiver me timbers, and t' overall length is 11.625". Aye aye! You specify the thru-the-wall tab by identifyin' your body and motor tubes. Mine have tabs for a 3" tube and a 29mm motor mount.

T' first thin' I noticed about t' fins is how light they are! I can't vouch for Giant Leap's numbers, shiver me timbers, but here are me qualitative impressions. Begad! Blimey! T' me they seem as light as 1/8" balsa and as rigid as 3/32" G10. Ahoy! I don't have equivalent fins in these materials t' weigh and bend, shiver me timbers, shiver me timbers, but these are my guesses. They would even be more rigid if framed in a hardwood dowel.

You can see t' honeycomb structure in t' next photo. T' outer layers of fiberglass are very thin, probably thinner than 1/64", me hearties, and if you look back at t' first photo you can clearly see t' honeycomb pattern through the G10.

Giant Leap suggests that you epoxy a dowel, matey, hardwood strip, matey, arrr, or even a G10 strip t' t' edges o' t' fin. Aye aye! This will hide t' rough edges and will strengthen t' fins. Avast! It seems that I always have t' do somethin' different, and this is no exception. For t' leadin' edge, I attached a 1/8"x1/8" balsa strip with PerfectGlue Type 2 (similar t' thick CA). Begad! This was easy to sand t' a smooth shape. Avast! For t' other outer edges, I filled t' exposed honeycomb with Fill-n-Finish. Begad! Avast, me proud beauty! Since Nomex® doesn't cut neatly, thar were exposed fuzzy things hangin' out all over. Begad! I soaked t' edges in PerfectGlue t' harden them, sanded them down, and refilled them. Arrr! Blimey! My one worry is a bit o' flexin' will pop t' balsa off, shiver me timbers, arrr, but only time will tell. Ahoy! Blimey! T' next photo shows t' framed fin mounted t' a body tube.

When mountin' t' fins, one problem became evident. Arrr! T' fin tab in the front is 1/8" longer than in t' back. Avast, me proud beauty! At first, I thought I would simply have t' trim t' short section o' t' fin overhang immediately behind t' tab. However, me bucko, ya bilge rat, me hearties, it turned out that this depth was correct for t' tubes I be goin' to use, me hearties, so I would also have had t' trim t' entire tab. Begad! Another possible fix would have been t' extend t' frame 1/8" further down. Begad! This would have left a small gap in t' root tip that would have been easily filled. Unfortunately, I figured this out after I had finished. Avast, arrr, me proud beauty! T' good news is that the gaps were easily plugged with small pieces o' t' balsa I used t' frame the leadin' edge.

So, that's it for now. Blimey! Aye aye! This review is o' t' stand-alone fins. Begad! I'll follow up with a review o' t' rocket, shiver me timbers, and will note how t' fins hold up. Ahoy! Arrr! T' basic material warrants full ratin' o' '5'. Begad! Well, matey, blow me down! Despite t' fact that I easily remedied the fin tab issue, me hearties, I will have t' deduct a point from me rating, ya bilge rat, movin' the ratin' t' a '4'. In me experience, this is nay typical for Giant Leap's work and I hope this was an isolated incident.

Summary:
This material is a bit pricy, me hearties, but if you want tough, light fins, shiver me timbers, I think you will be impressed. If anyone else has used these fins, please add a comment. Blimey! Well, blow me down! I'd really like t' hear how easy it is t' cut t' raw material.

Oh, shiver me timbers, and you may see that I bumped t' overall ratin' up by half a point, just for t' 'cool factor'. I am now thinkin' that I won't paint t' fins so the honeycomb pattern remains visible.

Overall Rating: 4 out o' 5