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| Electric Jets Discuss electric jets in Canada. |
Topic Review (Newest First)
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| 12-13-2016 03:54 AM | ||
| Louis |
Re: 90mm Snowbird edf flight video Would you be able to provide builders with the scale planes to build our own . i`m been working with foam cutters for some time . I would need to know . blank size to start with and so on Thanks louis |
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| 11-23-2016 02:18 PM | ||
| Johnny Canuck |
Re: 90mm Snowbird edf flight video Thanks for your comment! Unfortunately, this is a one-of that I designed and constructed from blue construction foam. It takes approx 100 hours to build and cover so, if I was to construct one to sell, it would be way more expensive than your typical ARF! |
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| 11-23-2016 02:09 PM | ||
| Louis |
Re: 90mm Snowbird edf flight video Where can I buy the tutor jet I would love to own one Thanks Louis |
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| 11-01-2016 09:31 PM | ||
| radlouni |
Re: 90mm Snowbird edf flight video 
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| 10-14-2016 01:56 PM | ||
| Edge54010 |
Re: 90mm Snowbird edf flight video awesome flying |
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| 10-12-2016 02:04 PM | ||
| Johnny Canuck |
Re: 90mm Snowbird edf flight video Hi Louis, do you mean the Ct-114 Snowbird in this video or a T-33 Shooting Star? I don't plan on making plans or parts available for the T-33 at this time. I may do something for the Snowbird down the road. Cheers! Mike |
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| 10-12-2016 10:37 AM | ||
| Louis |
Re: 90mm Snowbird edf flight video if you sell plans , or foam parts for the T -33 . I will take one Thanks for your reply Louis |
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| 08-29-2016 03:36 PM | ||
| Johnny Canuck |
Re: 90mm Snowbird edf flight video Hi Ken, Thanks for your interest! Unfortunately, this project has stalled (at least for the time being) because very few modelers have expressed interest in building the Snowbird. As mentioned, I have used different construction methods in building the first 4 and don't have a final set of plans or construction photos that I could easily post. To do this project properly, I would likely need to re-design the airplane so that it could be built by modelers who do not have the tools or knowledge to hot wire foam. This would take a fair bit of time - especially if I was to build and test the revised version and document the process. At the moment, I'm scratch building a foam de Havilland Buffalo so that's where my time and energy is being focused. Once this is complete, I may take on the Snowbird project again. If I do, I would possibly make vacuum formed canopies available for it. I will also post on this bulletin board if and when the project is back on. Cheers! Mike |
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| 08-29-2016 10:01 AM | ||
| cf100 |
Re: 90mm Snowbird edf flight video Quote:
Would love to see some pics of the construction process. cheers - ken k, winnipeg |
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| 07-23-2016 10:06 AM | ||
| Johnny Canuck |
Re: 90mm Snowbird edf flight video Hi Eric, It looks like Kerry pretty much answered your questions but I will provide a bit of clarification... I have used Ultracote, Econokote, and Towerkote over the blue foam on all of my recent models. I actually used Minwax, light fiberglass cloth and polyurethane paint on the first 2 EDF Snowbirds and this worked fine too but added a bit of weight to the model (these were the ones that came in around 3.4kg). Low temp iron-on coverings give a nice, light, glossy finish and add some strength to the structure. As Kerry mentioned, the first foam Snowbird survived some serious crashes as we were dealing with flex in the T-tail (later fixed by adding a built-up balsa vertical fin and stab). I design all of my models and decals using AutoCAD. I get the decals printed on self-adhesive vinyl at a local print shop. I can fit all of the Snowbird markings (except for the white bird and diamond markings on the bottom of the aircraft) on two 18" x 12" sheets. I have used different construction methods on the 4 Snowbirds built to date. The first one had balsa fuselage sides with blue foam pieces glued to the top, bottom and nose. Foam was also used for the intakes, T-tail, and wing. The other 3 models were all built from blue foam but had built-up balsa T-tails. I was experimenting with different construction techniques so each model was built a bit differently. The version shown in the flight video had 1" blue foam sides with foam cross pieces glued to the top and bottom. The nose and hump behind the canopy was hot wired to achieve the correct top view and side view profiles and then glued into place. Once put together, the square edges need to be shaped with a sharp utility knife and then sanded to achieve a round, scale appearance. It doesn't take long to do once you get the hang of it. As Kerry mentioned, I use lite ply for wing mounts, landing gear mounts, and the former near the trailing edge of the wing where the EDF is mounted. Some carbon fiber strips were added to the fuselage sides at the intake location to add strength. The first model had a removable top hatch to access the EDF but subsequent versions didn't. The EDF was simply installed through the wing opening and fit into the aforementioned former. I used a hot wire to carve the thrust tube inside the foam fuselage so a separate thrust tube was not required. The foam wings have a center section and 2 outer panels hot-wired from blue foam. On some of the models, I added balsa to the leading edge as well as to the aileron and flap hinge location. A 10mm diameter carbon fiber tube spar is used for strength. None of the 4 Snowbirds to date have had washout built into the wings but I might consider doing this on a future model to see if it makes a difference. I cut a small "cheater hole" in the centre of the wing to direct more air to the EDF but I think the plane would probably fly without it. As I mentioned in my first post, I may try to come up with a balsa/ply design so that it could be built by modellers who do not have the equipment or experience to build with foam. The challenge will be to keep the weight down and to achieve the curves and round edges that are so easy to do with foam but not so easy to do with a built-up structure. Changing gears, I have added a few photos of my recently-completed A-4 Skyhawk and Shrike Commander. Some basic specs: A-4 Skyhawk: all blue foam construction; span 40"; length 58"; wing area 556 in2; weight 2.9kg; 90mm 12 blade Changesun EDF; retractable nose gear/fixed main gear (main wheels only stick out slightly below landing gear "pods" built on underside of wing); 9g metal gear servos for ailerons, rudder, and nose steering servo; one 17g metal gear servo for elevator; Turnigy 100A Plush ESC (internal BEC used to power electronics); 5000 mAh Zippy 25C lipo Shrike Commander: all blue foam construction; span 64"; length 51"; wing area 572 in2; weight 2.7kg; 2 Turnigy G-10 motors; 2 Turnigy Plush 40A ESC's; metal RC Lander retracts; 3S 4000 mAh lipo; 9g metal gear servos for ailerons, flaps, rudder, and nose steering; one 17g metal gear servo for elevator. Hope this answers your questions. Cheers! Mike |
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