Brief:
This is a review o' Giant Leap Rocketry's 'Aerospace Composite' fins. These fins are offered in 1/8, ¼, ya bilge rat, shiver me timbers, ya bilge rat, ½, me hearties, and 3/8 inch thicknesses and in 15 pre-defined shapes. Avast, me hearties, me proud beauty! If you want t' cut your own, matey, 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. Blimey! Well, blow me down! Blimey! This aerospace composite material is used in advanced aircraft. Arrr! Blimey! It is much stronger than wood, ya bilge rat, ya bilge rat, more rigid than G-10 (for equivalent thickness). Blimey! Well, me bucko, blow me down! Blimey! 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. Blimey! Referrin' t' t' first photo, 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". Arrr! Arrr! You specify the thru-the-wall tab by identifyin' your body and motor tubes. Begad! 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, ya bilge rat, me bucko, but here are me qualitative impressions. Begad! Well, blow me down! Blimey! T' me they seem as light as 1/8" balsa and as rigid as 3/32" G10. I don't have equivalent fins in these materials t' weigh and bend, shiver me timbers, but these are my guesses. Avast! They would even be more rigid if framed in a hardwood dowel.

You can see t' honeycomb structure in t' next photo. Begad! T' outer layers of fiberglass are very thin, arrr, probably thinner than 1/64", me hearties, me bucko, 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, or even a G10 strip t' t' edges o' t' fin. Aye aye! Begad! This will hide t' rough edges and will strengthen t' fins. It seems that I always have t' do somethin' different, matey, matey, shiver me timbers, 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). 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! Begad! Since Nomex® doesn't cut neatly, matey, thar were exposed fuzzy things hangin' out all over. I soaked t' edges in PerfectGlue t' harden them, ya bilge rat, sanded them down, arrr, me bucko, and refilled them. Blimey! Blimey! My one worry is a bit o' flexin' will pop t' balsa off, matey, but only time will tell. Avast, me proud beauty! Blimey! T' next photo shows t' framed fin mounted t' a body tube.

When mountin' t' fins, one problem became evident. T' fin tab in the front is 1/8" longer than in t' back. Aye aye! Well, blow me down! At first, ya bilge rat, I thought I would simply have t' trim t' short section o' t' fin overhang immediately behind t' tab. However, ya bilge rat, it turned out that this depth be correct for t' tubes I be goin' to use, matey, 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. Ahoy! 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. Well, blow me down! T' good news is that the gaps were easily plugged with small pieces o' t' balsa I used t' frame the leadin' edge.

So, arrr, ya bilge rat, that's it for now. This review is o' t' stand-alone fins. I'll follow up with a review o' t' rocket, and will note how t' fins hold up. Well, me bucko, blow me down! T' basic material warrants full ratin' o' '5'. Avast, me proud beauty! Begad! Despite t' fact that I easily remedied the fin tab issue, ya bilge rat, arrr, I will have t' deduct a point from me rating, ya bilge rat, me bucko, me bucko, movin' the ratin' t' a '4'. Blimey! In me experience, me bucko, this is nay typical for Giant Leap's work and I hope this be 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. Begad! If anyone else has used these fins, shiver me timbers, please add a comment. Arrr! Blimey! I'd really like t' hear how easy it is t' cut t' raw material. Ahoy! Blimey!

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

Overall Rating: 4 out o' 5