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| Fixed Wing Discuss fixed wing aircraft. |
Topic Review (Newest First)
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| 11-20-2015 05:39 PM | |
| Pauld |
Re: Builing a Protege can anyone help me with the modifications that people have made Glad to see building is alive and well. Heard kits are coming back in the hobby. Personally, I'm finishing off a profile/3D / fun fly plane for a winter hucker. Been enjoying the process. Got a few kits in the box that I'll get to some day..... I've got a set of 36" floats if anybody wants them. Dunno who's kit they are but they're built up and covered in a silver/grey covering. In pretty good shape. 40 bucks plus Greyhound costs. PaulD |
| 11-18-2015 03:07 PM | |
| stegl |
Re: Builing a Protege can anyone help me with the modifications that people have made Thanks Rob fir the control explanation. I am sure that those that want to add flaps to the Protege can get info from Rob as to how he did it. Maybe even a pic or two. I might mention also that the reason I never use polyester resin any more is that it needs wax in it to cure and this can be an issue to get all cleaned off before priming plus the work time is way too little , meaning it sets up too fast and not enough time to scrape off the excess so you get big build up and a result ...too heavy. Those that have difficulty getting the Zepoxy finishing epoxy sometimes use the West System epoxies but not too sure which is best so will leave someone else chime in that has used it. |
| 11-18-2015 08:51 AM | |
| robd |
Re: Builing a Protege can anyone help me with the modifications that people have made The reason I enlarged my control surfaces wasn't for stability on floats, it doesn't need it, rather it was for snappier manouverability in the air. I like a very responsive airplane. Same reason for the big ailerons and flaps. I also prefer the older pattern ship style look rather than straight cut elevator and rudder. -Rob- |
| 11-17-2015 11:29 PM | |
| helibob1 |
Re: Builing a Protege can anyone help me with the modifications that people have made im glad i asked thought they might be too heavy.fiber glass resin it is.like the idea of putting aircraft strength plywood on the bottom.I did not build this plane .control surfaces have large gaps.binding , broken hinge.and warped .definitely changing out the elv and ail.and flimsy nylon control lines...thats why i was thinking of oversizing them.changing them anyways. Thanks for the help. 
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| 11-17-2015 11:53 AM | |
| stegl |
Re: Builing a Protege can anyone help me with the modifications that people have made Any float plane I have built has never had an increase of tail surfaces and they flew just fine. Most scale or near scale cubs do have a small vertical tail compared to wing size and possibly do need additional stability when on floats. In most cases this was done with a bottom sub fin as mentioned earlier. The Goldberg Protégé has a pretty big tail to begin with and will fly fine as is. As for finishing floats I have always gone with glass cloth covering. Depending on the size and all up weight of the aircraft I use 1/64 ply on the bottom( 8 lbs and over) of the forward float as far as the step and use contact cement for this. Make it a little oversize on outer edges and trim after down. On the center seam of the V, I put down 1.5 oz cloth about 1.5 inches wide. as soon as this is on layer another 1.5 oz layer covering the whole forward float making sure no bubbles. That way no sanding needed at the seams as it lays down well. For all glassing I use Pacer Zepoxy finishing resin. It goes a long way if you don't mix too much and have to throw out excess. I thin with about 10% pure methyl hydrate. I use 1.5 oz for the rest of the floats. I buy the alcohol by the gallon at any good hardware store as it can be used for cleanup and cleaning brushes for reuse. Primer and finishing paint can be of your choice. |
| 11-17-2015 06:34 AM | |
| Cougar429 |
Re: Builing a Protege can anyone help me with the modifications that people have made Iron on covering alone will not be very watertight. However, if you decide to go that way, best spray every exposed piece of wood with urethane to seal it. That's what I did to both the Northstar and Seamaster you see in the pic. Only difference is both have painted bottoms as iron-on does not abrade well. To seal the edges I applied a supplementary heat activated adhesive similar to what is seen here: http://www.shop4glue.com/heat-seal-a...glues-26-c.asp There are other ways to protect and give a good finish. Rather than laminating resin to apply layer(s) of glass cloth the recent method is to brush on Water Based Poly Urethane as the weight is much less. Even if you do not want the entire float surface glass cloth laminated you may opt to do just the bottoms. Those will be taking a beating. Spraying on and sanding that same WBPU with colour can be an alternative to iron on or glass cloth as it seals the wood and if some elbow grease is applied, a smooth finish in whatever colour you intend. Only problem is I find this side of the border our paints are no longer fuel proof and unless you can still find some pre-green era paints the other options appears to be engine paint, which is rather limited in colour choice. One last piece of advice I can think of this early (Caffeine Low" light is on) is you may need to add Chines on the front inner of each float to minimize spray getting at the prop. These are basically a small piece of material that is along the intersection of the side and bottom on that inside front angled down to redirect any spray or water. |
| 11-16-2015 11:41 PM | |
| helibob1 |
Re: Builing a Protege can anyone help me with the modifications that people have made Im working on the same build this winter.CG Protege on GP floats.this was my first plane its all ready a tail dragger and has a .76 gms glow. decent power. Havent tried floats yet.Im going to build them and was wondering if mono coat is durable enough.or should i go with fiberglass and resin? or just paint? Im going to add area to my control serfaces.and add a servo for the rudders on the floats.I know the advise wasent directed at me .but thank you all for the great advice.you got me thinking about flaps now.happy building this winter.
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| 10-24-2015 09:34 PM | |
| Cougar429 |
Re: Builing a Protege can anyone help me with the modifications that people have made Most real aircraft require adding vertical stab surface area with floats due to the fact they minimize what is designed in to save weight and cost. We are not limited that way and usually already have way more power/weight and control authority compared to full size. However, if you find the plane tends to yaw in turns you can easily add a supplemental fixed fin to the bottom aft fuse. In fact, the Goldberg float kit has that included. along with instructions on where to mount it. http://manuals.hobbico.com/gbg/gbgq0296-manual.pdf Ventral fin starts on bottom of Pg. 16. Since the Protege has independent aileron servos you already have the capability for flaperons built in. If your radio system has the programming option, just have to assign the second aileron to a spare channel and set up the Tx. I too would recommend going taildragger as it moves the main gear forward to a more conventional front float attach point anyway. Did that, flaperons and other mods to my Goldberg Eagle 2 many years ago. Adding bulkheads and doublers aft of the cabin floor allowed for the rear float struts to bolt on. Note: In the last pic you can see the steering arm exiting the bottom of the fuse. Ran Goldenrod down the the water rudder on that set. Subsequent builds have the servo mounted in a waterproof box inside the float body. psst. That is also NOT the conventional Eagle tail. Bought the kit partially built and that was missing. Grafted it on from what was left from an aero craft found in bulk purchase. |
| 10-24-2015 08:25 PM | |
| Reset |
Re: Builing a Protege can anyone help me with the modifications that people have made Thank Geoff and Rob, I have all the info I need now. |
| 10-24-2015 10:01 AM | |
| my1stflight |
Re: Builing a Protege can anyone help me with the modifications that people have made Dennis, If you get a hold of Pete from the Quesnel club, he has built a lot of protege, he has all the measurements of the mods he has done. I run a TT120 2 stroke in mine lots of power on floats. Send me a PM and I can get you the contact information for Pete. Geoff |
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