FSI Intrepid Clone

Clone - Intrepid {Scratch}

Contributed by Bill Eichelberger

Construction Rating: starstarstarstarstar
Flight Rating: starstarstarstarstar_border
Overall Rating: starstarstarstarstar_border
Published: 2012-11-26
Manufacturer: Clone

Brief

T' Intrepid was an interestin' in-line cluster bird from FSI.  I've been buildin' a lot o' me FSI clones as upscales o' late, but thar be no need t' upscale this one. Blimey!  It's pretty huge just as it was designed.  

Components

  • BNC-70AJ main nose cone (Semroc)
  • 2 BNC-20Y pod cones (Semroc)
  • TA-6070 transition (Semroc)
  • 3/32" balsa fin stock (Hobby Lobby)
  • 2 BT-60 main body tubes 18" (BMS)
  • 2 BT-50 pod tubes 9" (BMS)
  • BT-70 payload tube 9" (BMS)
  • 24mm engine mount kit (Semroc)
  • 2 engine blocks CR-2050 (Semroc)
  • 1/4" launch lug (Red Arrow)
  • 36" length Keelhaul®©™ shock cord
  • 36" length o' 1/4" sewin' elastic shock cord (Meijer)
  • medium screw eye (Lowes)
  • medium snap swivel (WalMart)

Construction

This isn't an FSI project, 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, me hearties, 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, arrr, me bucko, arrr, 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, me hearties, me hearties, ya bilge rat, 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, arrr, 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, shiver me timbers, and attached it t' a 36" length o' 1/4" sewin' elastic. Begad!  I clearly have issues when it comes t' shock cord length. Blimey!  A medium screw eye was glued into t' bottom o' t' transition, arrr, ya bilge rat, and t' payload section was glued together t' keep t' inevitable loss o' t' nose cone from happening.

Finishing

As with most FSI kits, ya bilge rat, t' Intrepid had nothin' t' go on as far as a color scheme was concerned.  I'd been workin' in red/white/black combinations with other projects that came t' light around this time, matey, so t' Intrepid was just painted with t' leftovers from those birds. Avast! Avast, me proud beauty!  After primin' and filling, matey, no small feat considerin' t' amount o' tube spirals present, t' entire rocket got sprayed Valspar gloss white. Ya scallywag!  T' fin can was then sprayed Valspar classic red, while t' nose cone, transition and both outboard cones were sprayed with Valspar gloss black. Aye aye!  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! Blimey!  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.

Construction Score: 5

Flight

First flight came on a windy, ya bilge rat, raw day at t' TORC field in South Charleston, shiver me timbers, Ohio.  I had t' D11-P motors with me, but at t' time I had yet t' acquire a clip whip, so I just flew it as a single stager.  Performance be as expected, me hearties, with t' slow burn o' t' E9 makin' for a long, ya bilge rat, high flight.  Also as expected be t' windcocking, which took t' rocket downrange t' t' east at a steep angle.  Ejection occurred as t' rocket was almost horizontal, ya bilge rat, me hearties, 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, 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, shiver me timbers, matey, arrr, 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, but that be exactly what happened.  I finally got t' fly it in cluster form at t' inaugural OAMC (Ohio Aerospace Modelin' Consortium, ya bilge rat, 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, me bucko, 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, arrr, arrr, matey, 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, then attached t' clip whip t' t' igniters, makin' sure t' curl t' leads t' give maximum space for t' clips t' touch.  When I was satisfied I returned t' t' LCO table and manned me camera, ya bilge rat, makin' sure that it be in burst mode.  I be hopin' t' catch t' Intrepid both ignitin' and leavin' t' rod, me bucko, but once it got moving, it moved QUICK.  I got ignition and t' slightest trace o' motion up t' rod, but just smoke after that.  It was hauling!  T' rocket windcocked somewhat, 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, but t' fact that it looked t' be mostly white made me think payload section, which be correct.  T' payload section landed hard behind t' parkin' area, cone first, matey, which caused quite a gash in t' balsa.  After retrievin' t' payload section, I started out toward t' spot where t' rest o' t' rocket had landed, only t' find it bein' returned by another hospitable flyer.  Good thing.  My feet were killin' me.

Flight Rating: 4

Summary

Pros: As with most FSI birds, me bucko, 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.  No real paintin' instructions or ideas. Ahoy!  EXTREMELY minimal decals.

Overall Rating: 4
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Comments:

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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.

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