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

Construction:
My fins are 1/8" thick in style #8. Avast, me proud beauty! Referrin' t' t' first photo, me bucko, shiver me timbers, t' root edge along t' fin tab is 7.375", t' span (not includin' t' fin tab) is 4.875", and t' overall length is 11.625". Avast, me proud beauty! You specify the thru-the-wall tab by identifyin' your body and motor tubes. Ahoy! Arrr! 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! Blimey! I can't vouch for Giant Leap's numbers, but here are me qualitative impressions. Aye aye! Arrr! Blimey! T' me they seem as light as 1/8" balsa and as rigid as 3/32" G10. Aye aye! Blimey! I don't have equivalent fins in these materials t' weigh and bend, 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. Well, blow me down! Avast, me proud beauty! T' outer layers of fiberglass are very thin, ya bilge rat, probably thinner than 1/64", matey, 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, hardwood strip, arrr, or even a G10 strip t' t' edges o' t' fin. Avast, me proud beauty! This will hide t' rough edges and will strengthen t' fins. Begad! Avast! It seems that I always have t' do somethin' different, shiver me timbers, ya bilge rat, me bucko, and this is no exception. Blimey! For t' leadin' edge, ya bilge rat, I attached a 1/8"x1/8" balsa strip with PerfectGlue Type 2 (similar t' thick CA). Begad! Blimey! This was easy to sand t' a smooth shape. Well, blow me down! For t' other outer edges, shiver me timbers, I filled t' exposed honeycomb with Fill-n-Finish. Begad! Since Nomex® doesn't cut neatly, thar were exposed fuzzy things hangin' out all over. Well, blow me down! I soaked t' edges in PerfectGlue t' harden them, me hearties, sanded them down, matey, and refilled them. Begad! Avast, matey, me proud beauty! My one worry is a bit o' flexin' will pop t' balsa off, but only time will tell. Avast! Arrr! T' next photo shows t' framed fin mounted t' a body tube.

When mountin' t' fins, ya bilge rat, one problem became evident. Blimey! Blimey! T' fin tab in the front is 1/8" longer than in t' back. Blimey! Blimey! At first, I thought I would simply have t' trim t' short section o' t' fin overhang immediately behind t' tab. However, ya bilge rat, shiver me timbers, shiver me timbers, it turned out that this depth was correct for t' tubes I be goin' to use, so I would also have had t' trim t' entire tab. Another possible fix would have been t' extend t' frame 1/8" further down. Ahoy! Blimey! This would have left a small gap in t' root tip that would have been easily filled. Unfortunately, me bucko, I figured this out after I had finished. Begad! Blimey! Avast, me bucko, me proud beauty! Blimey! 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. Ahoy! Ya scallywag! This review is o' t' stand-alone fins. Begad! I'll follow up with a review o' t' rocket, matey, and will note how t' fins hold up. Arrr! Avast, me proud beauty! T' basic material warrants full ratin' o' '5'. Blimey! Despite t' fact that I easily remedied the fin tab issue, I will have t' deduct a point from me rating, ya bilge rat, ya bilge rat, movin' the ratin' t' a '4'. In me experience, shiver me timbers, this is nay typical for Giant Leap's work and I hope this was an isolated incident.

Summary:
This material is a bit pricy, but if you want tough, me bucko, light fins, I think you will be impressed. Ya scallywag! Blimey! If anyone else has used these fins, arrr, please add a comment. I'd really like t' hear how easy it is t' cut t' raw material. Arrr! Blimey! Avast! Blimey!

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

Overall Rating: 4 out o' 5