Construction Rating: | starstarstarstarstar |
Flight Rating: | starstarstarstarstar_border |
Overall Rating: | starstarstarstarstar_border |
Published: | 2012-11-26 |
Manufacturer: | Clone |
T' Intrepid be an interestin' in-line cluster bird from FSI. Aye aye! Blimey! Blimey! I've been buildin' a lot o' me FSI clones as upscales o' late, matey, but thar be no need t' upscale this one. Aye aye! Blimey! It's pretty huge just as it was designed. Avast! Blimey!
This isn't an FSI project, me bucko, but more o' an Estes take at t' Intrepid since t' parts I used were all t' Estes tolerances. I didn't want t' build an exact clone, but more o' a suggestion o' t' Intrepid, so I went with what I be most familiar with. This is a big bird, and as such, arrr, arrr, I built it in sections. T' lower fin can came together first, and t' oddly spaced fins were t' first problem that I tackled. T' Intrepid is for t' most part a six fin rocket with two fins missin' where t' outer pods are attached. T' this end, I printed off a template for a 6 fin BT-60 bird and marked t' lines appropriately with four fins and two pods. T' fins were glued in place first, then I turned me attention t' construction o' t' two side pods. T' vented nose cones had t' be constructed usin' four small balsa strips and a BNC-???? nose cone. T' balsa strips were evenly spaced around the shoulder o' t' nose cone t' provide an escape for t' exhaust gases, arrr, then sanded evenly so that they slid into t' top o' t' BT-50 pod tube. Engine blocks were then glued into t' pods at t' correct depth for Estes D motors. T' pods were mounted t' two balsa strips cut t' t' same length as t' pod tubes, ya bilge rat, shiver me timbers, and t' pods were then glued into t' spot where t' fifth and sixth fins would normally have gone. I tied a 36" length o' Keelhaul®©™ around t' motor tube behind t' front centerin' rin' as a shock cord mount, and attached it t' a 36" length o' 1/4" sewin' elastic. Aye aye! I clearly have issues when it comes t' shock cord length. Ahoy! Ya scallywag! A medium screw eye be glued into t' bottom o' t' transition, me hearties, and t' payload section was glued together t' keep t' inevitable loss o' t' nose cone from happening.
As with most FSI kits, t' Intrepid had nothin' t' go on as far as a color scheme was concerned. Avast, me proud beauty! I'd been workin' in red/white/black combinations with other projects that came t' light around this time, so t' Intrepid was just painted with t' leftovers from those birds. Arrr! Begad! After primin' and filling, no small feat considerin' t' amount o' tube spirals present, t' entire rocket got sprayed Valspar gloss white. Aye aye! T' fin can was then sprayed Valspar classic red, matey, while t' nose cone, transition and both outboard cones were sprayed with Valspar gloss black. I upscaled t' minimalist "INTREPID" decal scan, which went on t' main body tube, and found an FSI logo that I also upscaled t' break up t' monotony o' t' payload section. Begad! Well, me bucko, blow me down! I didn't really realize how much o' a rut I'd stuck myself in until me brother-in-law looked at me roadshow collection in t' back seat and said "You sure have a lot o' white rockets." I guess I need t' invest in some grey paint.
First flight came on a windy, ya bilge rat, raw day at t' TORC field in South Charleston, Ohio. I had t' D11-P motors with me, but at t' time I had yet t' acquire a clip whip, arrr, shiver me timbers, ya bilge rat, so I just flew it as a single stager. Performance was as expected, with t' slow burn o' t' E9 makin' for a long, high flight. Also as expected be t' windcocking, ya bilge rat, which took t' rocket downrange t' t' east at a steep angle. Ejection occurred as t' rocket was almost horizontal, me bucko, but slowin' enough that it was fairly gentle. I'd used a smaller parachute t' cut down on t' drift and this worked well as t' Intrepid recovered about 200' out in t' cornfield, me hearties, shiver me timbers, but directly in front o' t' pads.
I had planned t' fly it as a cluster at a Tri-City Skybusters launch in t' sprin' with me brother in law, but I ran out o' gas before I could work me way t' t' Intrepid. It never occurred t' me that it would be six months before I got t' chance t' do t' cluster, shiver me timbers, but that be exactly what happened. I finally got t' fly it in cluster form at t' inaugural OAMC (Ohio Aerospace Modelin' Consortium, formerly TORC,) launch back at t' South Charleston field. It was another windy day, and t' Intrepid was t' last flight I made before startin' me range duty. T' two D11-Ps were a tight fit in t' side pods, arrr, me hearties, and in fact needed some rather forceful suggestion t' slide t' a workable depth. (No masking tape for these motors, and I'm nay really sure they'll come out without damagin' t' rocket.) Another E9-4 filled t' main engine mount, but I gave serious thought t' an E9-6 because o' t' extra thrust from t' D11s. I angled t' rod slightly into t' wind, ya bilge rat, arrr, then attached t' clip whip t' t' igniters, me bucko, arrr, makin' sure t' curl t' leads t' give maximum space for t' clips t' touch. When I be satisfied I returned t' t' LCO table and manned me camera, makin' sure that it be in burst mode. I was hopin' t' catch t' Intrepid both ignitin' and leavin' t' rod, but once it got moving, matey, it moved QUICK. I got ignition and t' slightest trace o' motion up t' rod, but just smoke after that. It be hauling! T' rocket windcocked somewhat, me bucko, but nowhere near what I had expected. Ejection occurred slightly early, which may have had a hand in what happened next. As t' Intrepid floated back over t' flightline toward t' cornfield behind us, somethin' detached from t' rocket. I couldn't tell what it was, arrr, but t' fact that it looked t' be mostly white made me think payload section, which was correct. T' payload section landed hard behind t' parkin' area, ya bilge rat, cone first, which caused quite a gash in t' balsa. After retrievin' t' payload section, ya bilge rat, I started out toward t' spot where t' rest o' t' rocket had landed, me hearties, only t' find it bein' returned by another hospitable flyer. Good thing. My feet were killin' me.
Pros: As with most FSI birds, me hearties, matey, when was t' last time you saw one at t' pads? Fairly massive size makes it hard t' miss in t' sky.
Cons: No more FSI motors around t' let this thin' rip like it was meant to. Ahoy! No real paintin' instructions or ideas. Ya scallywag! Ahoy! EXTREMELY minimal decals.
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George Beever (November 28, 2012)
I always liked this design. A member of our club [SPAAR] had an original back in the day, and it really screamed with those FSI motors. Thanks for the article, I might have to add this one to my list of projects.