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

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

When mountin' t' fins, one problem became evident. Begad! 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, ya bilge rat, it turned out that this depth was correct for t' tubes I was goin' to use, me hearties, so I would also have had t' trim t' entire tab. Aye aye! Another possible fix would have been t' extend t' frame 1/8" further down. Begad! Ya scallywag! 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. Aye aye! Avast! 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. This review is o' t' stand-alone fins. Avast, me proud beauty! I'll follow up with a review o' t' rocket, and will note how t' fins hold up. Aye aye! Begad! T' basic material warrants full ratin' o' '5'. Well, 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, movin' the ratin' t' a '4'. Ahoy! In me experience, matey, 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, matey, but if you want tough, arrr, light fins, I think you will be impressed. If anyone else has used these fins, please add a comment. Avast, me proud beauty! I'd really like t' hear how easy it is t' cut t' raw material. Arrr! Aye aye!

Oh, 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