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RE: Gruman Ag-Cat
Good evening, Thanks for the interest. Unfortunately I haven't made much progress recently. Uncle Sam keeps me pretty busy, even though I'm a civilian now. Hopefully this Xmas I can get some down time to continue working on it. I'll post pix as I make progress. Mac49
Posted on: 11/1/2008 9:17 PM by Author "mac49"
in the forum "Giant Scale Aircraft - General"
http://www.rcuniverse.com/forum/fb.asp?m=8105890
RE: Gruman Ag-Cat
I''m actually working in the living room of an old cottage my wife and I own. Gives me a 13 X 15 foot work area. (I also have the rest of the house but the rooms are pretty small. You get use to the pink interior after awhile.) I don''t have the 4 X 8 foot work bench situated where I can assemble it. ( I have a row of book cases taking up the wall opposite the window in front. I clamped it together a few weeks ago to get the feel for how it is going to go together. Looked pretty good to me. It took up most of my side of our two car garage. My wife''s Pathfinder sat on the other side in the photo. It will certainly look nice parked on the runway the first time after I get it done. It''s going to be a while though.
Posted on: 4/15/2008 10:53 PM by Author "mac49"
in the forum "Giant Scale Aircraft - General"
http://www.rcuniverse.com/forum/fb.asp?m=7379729
RE: Gruman Ag-Cat
Ok here''s the gear. I tried to follow Floyd''s plan but my over-engineering got the best of me. The LG is made by TNT from 5/16" 6061, wheels are 8.5" from a mountain skate board. They come with 10mm bearings and I''ve inserted bushing I made at home from stock bought from Aricraft Spruce. The fuselage where the LG attaches is not quite 1/4inch ply with a 1/8 door skin doubler. I used a 2 inch wide by 3/4 inch fir backer for the LG. There are a couple of 3/4 inch plywood clamps on the end to help spread dynamic loads to the doublers. Its all glued and screwed together. It''s attached with six 10-24 cap screws with nylock nuts. The tailwheel needs more work. I manufactured it from 1 1/2in x 1/4 in 6061 bar stock. I didn''t get it bent as nicely as TNT. The caster frame is cut from 3/32 in 3003 and also needs some correction. Thats a 4" Dubro wheel but it wan''t ment for a tail wheel. I''m probably going to need to drill it out an put in a brass tube insert.
Posted on: 4/15/2008 7:28 PM by Author "mac49"
in the forum "Giant Scale Aircraft - General"
http://www.rcuniverse.com/forum/fb.asp?m=7378618
RE: Source for 8" inflatable wheels
This is the outfit I bought the attached wheels from. They are for a mountain board and come in two sizes, these are the larger approx 8.5 inch. They are a little heavy so the model needs to be the same. They come with a 10mm set of bearings so if you use the 1/4inch axels, you''ll need to bush them. I bought the bushing material from aircraft spruce and turned them down in my lathe but you could do the same in a drill press with a file. I reamed them out with an "F" drill bit from my indexed set. http://discountwheelandskate.com/pnwh.html
Posted on: 4/15/2008 7:06 PM by Author "mac49"
in the forum "Giant Scale Aircraft - General"
http://www.rcuniverse.com/forum/fb.asp?m=7378545
RE: Gruman Ag-Cat
I have a number of large single cylinder engines I'm converting, something in the 120cc plus range. I'd really like to install a twin but the budget just isn't there yet. If I can't get enough thrust, I'll have to talk to the spouse about buying a used twin. I'm looking at next year at the earliest since I'm hitting the road shortly for an extended period. I'd hope to be in that weight range, but it'll probably be pushing the max allowed. There is very little balsa in it as it is. A lot of pine and spruce, or white wood as they call it at HomeDepot. There was additional 1/4 ply used in the fuselage to help dampen out the vibrations I expected from the large thumper.
Posted on: 4/5/2008 3:12 AM by Author "mac49"
in the forum "Giant Scale Aircraft - General"
http://www.rcuniverse.com/forum/fb.asp?m=7335679
RE: Gruman Ag-Cat
Should be a little over 144 inches.
Posted on: 3/31/2008 9:18 PM by Author "mac49"
in the forum "Giant Scale Aircraft - General"
http://www.rcuniverse.com/forum/fb.asp?m=7313568
RE: Gruman Ag-Cat
Just a quick update on the 33% version I've been building. Slow going. Will be putting it away until August. Uncle likes to send me places so I'll get some time to think about making the fittings to hook up all the parts that are hanging on with clamps. Still haven't decided on covering. It's pretty heavy so I'll have to go light. Next time I'm going to use a lot more balsa. Or, make it bigger and fly it myself. I only off set the tail 1.5 degrees. The tail feathers are removable as well as wings and struts. One picture shows the landing gear attachment screws. I may change them to nylon when flying. This critter fills Frank Tennino's call for heavy aircraft. I'll have to start saving my allowance so I can buy a more powerfull engine.
Posted on: 3/30/2008 10:51 PM by Author "mac49"
in the forum "Giant Scale Aircraft - General"
http://www.rcuniverse.com/forum/fb.asp?m=7308737
RE: Large Wheels
This is what I got from this company. http://discountwheelandskate.com/pnwh.html They were $18.95 each, pneumatic, nylon hub, and weigh about 1.5 lb each. They do have a 10mm bearing in them so you will need to sleve them or use metric mounting. They are going in a 33% Grumman Ag-cat which is going to be weighing in around 50 lb. mac49
Posted on: 1/27/2008 12:20 PM by Author "mac49"
in the forum "Giant Scale Aircraft - General"
http://www.rcuniverse.com/forum/fb.asp?m=6977885
RE: crop duster r/c
Outofcontrol41, You've taken your plane to a much higher level in detail than I intend to take my Ag-Cat; I'm really impressed and envious. Maybe I should send it over in a moving van in a couple of years for your finalization. I'm heading out of town toomorrow. I'll start posting my progress on this thread on the Ag-Cat. mac49
Posted on: 1/13/2008 12:17 PM by Author "mac49"
in the forum "RC Scale Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=6899960
RE: Gruman Ag-Cat
mine together. (I'll be working on the E-2 once in awhile also.) PS - HAPPY NEW YEAR! mac49... a number of lengthy trips coming up. I'll post my progress. mac49
Posted on: 1/1/2008 6:17 PM by Author "mac49"
in the forum "Giant Scale Aircraft - General"
http://www.rcuniverse.com/forum/fb.asp?m=6835055
RE: Gruman Ag-Cat
to retire and build a hanger. Spouse and college aged kids have other ideas though. mac49
Posted on: 12/31/2007 12:47 AM by Author "mac49"
in the forum "Giant Scale Aircraft - General"
http://www.rcuniverse.com/forum/fb.asp?m=6829759
RE: Gruman Ag-Cat
familiar with Naval Engineering. mac49
Posted on: 12/30/2007 11:38 AM by Author "mac49"
in the forum "Giant Scale Aircraft - General"
http://www.rcuniverse.com/forum/fb.asp?m=6825957
RE: Gruman Ag-Cat
. Does anyone know how bio-diesel does as a lubricant? mac49
Posted on: 12/28/2007 12:48 PM by Author "mac49"
in the forum "Giant Scale Aircraft - General"
http://www.rcuniverse.com/forum/fb.asp?m=6816270
RE: Gruman Ag-Cat
Span will be 12 feet and around 7 feet 6 inches in length. mac49
Posted on: 12/24/2007 4:55 PM by Author "mac49"
in the forum "Giant Scale Aircraft - General"
http://www.rcuniverse.com/forum/fb.asp?m=6799973
RE: Gruman Ag-Cat
with also. I also use polyurathane cement, so building time is much slower. mac49
Posted on: 12/22/2007 3:58 PM by Author "mac49"
in the forum "Giant Scale Aircraft - General"
http://www.rcuniverse.com/forum/fb.asp?m=6791689
RE: Gruman Ag-Cat
of the weight issue. Mac49.
Posted on: 12/21/2007 7:34 PM by Author "mac49"
in the forum "Giant Scale Aircraft - General"
http://www.rcuniverse.com/forum/fb.asp?m=6788609
RE: Source for modeling wood?
for. They're an all purpose Homedepot. mac49
Posted on: 12/16/2007 10:19 PM by Author "mac49"
in the forum "RC Scale Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=6766836
RE: Where to get Grumman Tracker plans ?
Try this website:http://www.carlb-rcplanes.com/ The Grumman Tracker he's showing is a little larger than what you've indicated.
Posted on: 2/1/2007 8:30 PM by Author "mac49"
in the forum "RC Warbirds and Warplanes"
http://www.rcuniverse.com/forum/fb.asp?m=5357937
RE: Modelers in or near Seattle or Ottawa -- little help?
Just one more. It's really an attractive aircraft.
Posted on: 1/30/2007 10:49 PM by Author "mac49"
in the forum "RC Scale Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=5348697
RE: Modelers in or near Seattle or Ottawa -- little help?
Hopefully the ones I've tried to upload are there. Windsock has a good datafile on the snipe and Replicraft has an excellent set of 1/5 scale drawings. I've purchased his SE5A and Fokker D7 for a retirement project.
Posted on: 1/30/2007 10:41 PM by Author "mac49"
in the forum "RC Scale Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=5348646
RE: Modelers in or near Seattle or Ottawa -- little help?
I have some other shots but the Snipe wasn't what I went to the museum to shoot photos of. I have the underside in half meg files. They'd have to be resized inorder for them to fit.
Posted on: 1/30/2007 12:33 AM by Author "mac49"
in the forum "RC Scale Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=5344229
RE: Modelers in or near Seattle or Ottawa -- little help?
Here is what I have available. The Snipe was hanging in the overhead and was a little beyond the rang of my flash.
Posted on: 1/30/2007 12:28 AM by Author "mac49"
in the forum "RC Scale Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=5344219
RE: gas fuel with glo plug no ignition
Horizon has added a picture. Looks pretty straight foward for machining. http://www.horizonhobby.com/Shop/ByCategory/Product/Default.aspx?ProdID=ZEN23445
Posted on: 1/28/2006 11:38 AM by Author "mac49"
in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=3835688
Model Engine Building Website
For those who have an interest in learning model engineering skills (lathe, mill, drill, etc) this would be a good website to visit. http://modelenginenews.org/index.html
Posted on: 1/11/2006 10:05 AM by Author "mac49"
in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=3760653
RE: Lathe
It would be greatly appreciated if those who are in the know could put a few digital how-to's in this thread for those of us learning these skills. Prop hubs and glow plug adapters would be great starters. Lay-out, set-up, cutting, finishing, help![:D]
Posted on: 12/9/2005 1:55 PM by Author "mac49"
in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=3635782
RE: Pfalz DIII resources -- Photos, Drawings, Plans, etc.
Abufletcher, if I remember correctly, the Windsock Datafile on the Pfalz D XIII has a pictorial essay on the construction of the fuselage that describes a similar methodology to your above description. They used a mold to which they applied a layer of veneer angled at 45 degrees. A thin layer of strips of cloth was the next layer followed by a second layer of veneer laid on at 90 degrees to the first layer of veneer. All is saturated with casein glue. The final layer of veneer was sanded and then a second final layer of cloth sealed the layers. This structure was removed from the mold and attached to the formers to maintain it rigid. There was of course an opposite side to complete the fuselage. The datafile stated that it was very light, rigid and aerodynamic. Mark
Posted on: 4/22/2005 10:35 AM by Author "mac49"
in the forum "RC Scale Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=2901611
RE: Movies scale buffs shouldn't miss?
The "Victory at Sea" TV and DVD series. Also the movie "1941" with John Baluchi and Dan Ackroid. (I hope they forgive the way I butchered their names. I believe this was previously mentioned but called "1942".) Great P-40 scenes!
Posted on: 4/12/2005 12:29 AM by Author "mac49"
in the forum "RC Scale Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=2868005
RE: Lawnboy Engines?
I purchased this one off of ebay. I haven't check with my local Lawn-Boy dealer but I think it can be purchased as a shortblock. That was the way it was advertised on the auction. The diagram I downloaded from Lawn-Boy also showed it as an assembly.
Posted on: 3/2/2004 10:19 AM by Author "mac49"
in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=1582640
RE: Lawnboy Engines?
Thought I'd add my nickels worth. Pictures, if they uploaded, are of an F-series short block by lawn-boy. I just received it in the mail as a long term project. It's quite different from the M-series that I saw pictures of here earlier. I'm interested in keeping the weight down so I think I'll be converting this to E85 glow fuel to see how it runs. I've been following another thread that has really introduced some interesting concepts that are worth trying. This particular engine has the carb mounted below the crankshaft. It is listed with a carb having a .5" venturi but I'd think it should support something larger. I've got a WJ-10A that looks like it can be attached using an adapter. The carb flang is square and has a reed on the inside and there is a pressure tap located in the flange. There are cast-in lugs that could be used for mounting. I believe the long shaft PTO side needs to be cut off and a tapered hub cut for the prop. I haven't confirmed the displacement yet but it looks to be up around 120 to 140 cc's. It is pretty short stroked and appears to be on ball bearings from a diagram I downloaded from lawn-boy. There is a bolted on assembly that is part of the blade brake; it comes right off. I haven't weighted it yet but my guess is that it weights as much as two of my ST 4500 engines. I've got a really large bi-plane in mind as its future home. I don't think I'll need to add any additional weight in the nose for my overweight tail. Anyone have any thoughts as to a starting point on the prop?
Posted on: 2/29/2004 6:05 PM by Author "mac49"
in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=1577126
RE: Need advice on Wood Selection
I think that would be true for hardwood aviation plywood but I wouldn't extend it to other lite plywoods. I find it easier to mill my own hardwood blocks. I've got a stack of hardwood scrape that yields pretty much what I need.
Posted on: 1/22/2004 10:38 PM by Author "mac49"
in the forum "Scratch Building, Aircraft Design, 3D/CAD"
http://www.rcuniverse.com/forum/fb.asp?m=1457622
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