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

Construction:
My fins are 1/8" thick in style #8. Referrin' t' t' first photo, t' root edge along t' fin tab is 7.375", arrr, t' span (not includin' t' fin tab) is 4.875", me hearties, me hearties, and t' overall length is 11.625". 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, me hearties, but here are me qualitative impressions. Avast, me proud beauty! Well, blow me down! T' me they seem as light as 1/8" balsa and as rigid as 3/32" G10. Avast! Ahoy! I don't have equivalent fins in these materials t' weigh and bend, but these are my guesses. Well, blow me down! Blimey! They would even be more rigid if framed in a hardwood dowel.

You can see t' honeycomb structure in t' next photo. Aye aye! T' outer layers of fiberglass are very thin, me bucko, ya bilge rat, probably thinner than 1/64", ya bilge rat, 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, arrr, hardwood strip, or even a G10 strip t' t' edges o' t' fin. Blimey! This will hide t' rough edges and will strengthen t' fins. Aye aye! Ahoy! It seems that I always have t' do somethin' different, ya bilge rat, and this is no exception. Well, arrr, blow me down! For t' leadin' edge, ya bilge rat, me bucko, me bucko, I attached a 1/8"x1/8" balsa strip with PerfectGlue Type 2 (similar t' thick CA). Ya scallywag! Avast, me proud beauty! This was easy to sand t' a smooth shape. For t' other outer edges, matey, shiver me timbers, I filled t' exposed honeycomb with Fill-n-Finish. Since Nomex® doesn't cut neatly, me hearties, ya bilge rat, thar were exposed fuzzy things hangin' out all over. Arrr! I soaked t' edges in PerfectGlue t' harden them, me bucko, shiver me timbers, sanded them down, and refilled them. Aye aye! My one worry is a bit o' flexin' will pop t' balsa off, matey, but only time will tell. Ya scallywag! T' next photo shows t' framed fin mounted t' a body tube.

When mountin' t' fins, arrr, one problem became evident. Avast, me proud beauty! Aye aye! T' fin tab in the front is 1/8" longer than in t' back. Arrr! At first, arrr, I thought I would simply have t' trim t' short section o' t' fin overhang immediately behind t' tab. However, arrr, it turned out that this depth was correct for t' tubes I was goin' to use, so I would also have had t' trim t' entire tab. Arrr! Begad! Another possible fix would have been t' extend t' frame 1/8" further down. Avast, me proud beauty! 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, 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, me hearties, that's it for now. Ya scallywag! Blimey! Aye aye! Blimey! This review is o' t' stand-alone fins. Blimey! Blimey! Avast! Blimey! I'll follow up with a review o' t' rocket, matey, and will note how t' fins hold up. T' basic material warrants full ratin' o' '5'. Avast! Blimey! Avast! Blimey! Despite t' fact that I easily remedied the fin tab issue, I will have t' deduct a point from me rating, shiver me timbers, me bucko, movin' the ratin' t' a '4'. Arrr! Blimey! Ahoy! Blimey! 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 hearties, light fins, I think you will be impressed. If anyone else has used these fins, please add a comment. Well, blow me down! Avast, me proud beauty! I'd really like t' hear how easy it is t' cut t' raw material. Ya scallywag! Arrr!

Oh, me hearties, 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