Goldberg Tiger Club
11-16-2014, 09:53 PM
#1002
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You can give credit to the plane if you want but that is quite an accomplishment . I managed it years ago doing a maiden on a friends plane . It hadn't been properly preflighted . I can,t remember what kind of plane . Anyway somebody yelled for me to use the rudder so I did . It wobbled all over the place and I barely got it back but did make it . After it was over my knees started knocking . I am usually able to keep my cool in a crisis but after its over it hits me . I was glad I recognized what was wrong right away and let the guys beside me know because without their help I doubt I would have made it .Reversed ailerons are almost always a recipe for disaster . I was almost a newby back then and probably had faster reflexes .
11-16-2014, 10:04 PM
#1003
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jkr_1100 how did you make out with your 1/4 Scale Sig Cub with the Saito 180 . I have a 1/4 Scale Sig Cub with a OS fs120 in it and I love it . It's one of my favorite planes . I might build another one . I built a BUSA one but its not as easy to put together at the field .It has a Gemini twin in it .
Last edited by bikerbc; 11-17-2014 at 03:30 PM. Reason: addition
11-18-2014, 01:00 PM
#1004
The Golberg retracts were indeed nylon and mechanical sized for a 40 sized low wing plane in the 80's They came in a triangular box with a hacked servo that operated to the up or down position through a pair of micro switches. You were supposed to put a bump on your throttle cable that would hit the up switch with full throttle and full throttle trim. The switch would power the servo (2 AA batteries) and the gear came up Then the bump would hit the down switch at idle and mid throttle trim to power the servo to put the gear down. My Dad had them mounted on a test board but never put them in a plane.
11-18-2014, 01:05 PM
#1005
Thanks Major Tomski for letting me know I'm not ready for the laughing academy yet! I had a Jack Stafford P-51D kit in a .40 size that i remembered buying Goldberg retracts to use in it but I never completed the model before I quit the hobby when I got married and started a family. I haven't ever seen that kit again or found anything on it at all. I must be the only one who bought one.
11-18-2014, 01:10 PM
#1006
Unfortunately, after all of these years, I have since taken 2 other airplanes off with the ailerons reversed, and both resulted in a very quick and hard inverted landing! I have to give a lot of the credit to the Sky tiger, and the fact I was only 16 yo at the time. Young mental clarity helped for sure.
I suppose to complete the story of that Sky Tiger, I had installed the wing with rubber bands. For some reason one day I only put on enough to hold the wing on, planning to add the rest later. Big mistake! During a high speed pass, with only a couple of #64 bands on it, the wing came off and the fuse became a cruise missile. That is how my Sky tiger met it's demise. 1986-1991 RIP. It was an important plane for me. Maybe one day I will have another.
I suppose to complete the story of that Sky Tiger, I had installed the wing with rubber bands. For some reason one day I only put on enough to hold the wing on, planning to add the rest later. Big mistake! During a high speed pass, with only a couple of #64 bands on it, the wing came off and the fuse became a cruise missile. That is how my Sky tiger met it's demise. 1986-1991 RIP. It was an important plane for me. Maybe one day I will have another.
11-18-2014, 05:46 PM
#1007
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I did splatter one float plane ,when I took off with the ailerons reversed . Just a nice smooth lift off then a slight roll with a incorrect control input and a sudden full speed dive into the drink . I did not do a proper preflight . I had a buddy trying to set up a few things for me on my radio like throttle cut off and rudder aileron mix and somehow I ended up with reversed ailerons . It is the Pilots responsibility to ensure that the plane is safe to fly and I did not do my job . A preflight is very important . I try to do a proper preflight every time .
11-25-2014, 04:40 PM
#1009
11-25-2014, 05:08 PM
#1010
Join Date: Mar 2013
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Hi lonestoner, I believe (on my tiger anyway) the motor mount plate is cut at an angle
If you are using a standard motor mount you can use Ernst thrust shims, they come in a pack of four I believe/
Calvi
If you are using a standard motor mount you can use Ernst thrust shims, they come in a pack of four I believe/
Calvi
11-25-2014, 05:26 PM
#1011
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The original Sky Tiger, was an Eagle 63 turned upside down to be a low wing. So essentially it was a low wing trainer. I built one in 1985. With a 63" wing, it is a .60 sized airplane. The New Tiger 2 models are different, and that is when they made them a .45 and a .60 size. The .60 deluxe had a retract version. These aircraft came long after Carl had passed. Goldberg did have plastic resin retractable gear sets long ago. They were mechanical, I have no personal experience with them.
While adding retracts would add some weight, I find it hard to believe the extra weight would effect the already super low wing loading of the Tiger series. I wonder what exactly that little extra weight did to the performance? It had to land faster? Retracts are a tricky beast, but in a setup like this, they can be very user friendly. Robart makes a set that are spring down, so if you lose air, they come down automatically. The only issues I have had with this set of retracts is a servo issue with the valve. Nothing to do with the retracts themselves. I personally do not think retracts are worth it on a sport model such as this, but they can be fun to play with, and good practice for that warbird you always wanted!
While adding retracts would add some weight, I find it hard to believe the extra weight would effect the already super low wing loading of the Tiger series. I wonder what exactly that little extra weight did to the performance? It had to land faster? Retracts are a tricky beast, but in a setup like this, they can be very user friendly. Robart makes a set that are spring down, so if you lose air, they come down automatically. The only issues I have had with this set of retracts is a servo issue with the valve. Nothing to do with the retracts themselves. I personally do not think retracts are worth it on a sport model such as this, but they can be fun to play with, and good practice for that warbird you always wanted!
11-25-2014, 06:27 PM
#1013
I have to strongly disagree with those stating that adding retracts ruined the design. I built mine from the deluxe kit made it electric powered, and have thousands of trouble free flights with never a gear issue! Some of those guys that have gear issues, always will no matter what brand they use. I would always add retracts to any plane that could fit them in to clean up the plane in flight. It is a nice flying plane either way but IMHO much better with retracts.
Now having problems getting retracts to be reliable are a whole other issue. Experience is key here. I think adding retracts to a Sky tiger is a great idea. But this is just my opinion.
11-26-2014, 05:21 PM
#1015
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I made a mistake , the fuse sides are interchangeable . I usually put my engines in upright and what I do is sight down thru the cooling fins on the head and look at the tail . What I look for is to be off set just a bit to the right . You can usually get enough in the motor mount before you drill the holes to mount it and if you already have you can put a shim behind the one side .
12-01-2014, 05:35 PM
#1017
Join Date: Nov 2006
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Fellow tiger brotherhood and rcu peeps, please let me introduce my new tiger 2 kit newly finished, powered with an old school thunder tiger pro 46 and Futaba radio equip.as you can see its a tail dragger ,
Stoner.
Stoner.
12-02-2014, 06:33 AM
#1019
Major tomski
Your description of the Golberg retract system was on the mark but is descriptive of the earlier days, I still use them and a 180 degree servo properly adjusted works great. and I feel confident in saying not many flyers out there would notice the difference in performance of the bird except for the improved roll rate. and good looks of the bird with the gear up. (IMHO)
Your description of the Golberg retract system was on the mark but is descriptive of the earlier days, I still use them and a 180 degree servo properly adjusted works great. and I feel confident in saying not many flyers out there would notice the difference in performance of the bird except for the improved roll rate. and good looks of the bird with the gear up. (IMHO)
12-04-2014, 05:21 AM
#1023
A little clarification on my post with respect to the Deluxe version of the Tiger 60.
I'd like to make it clear that my comments apply ONLY to the Goldberg kitted and released "Deluxe" version. Before Paul's death the company had been on a roll with some absolutely fantastic designs.
The Deluxe release appeared to be a last shot at getting more mileage out of the Tiger. They didn't even bother to redesign the plans or the instruction manual, They just tossed in an addenddum:
http://manuals.hobbico.com/gbg/gbga0062-manual.pdf
All I know is that I loved the stock tiger and expected more from CG inc when they added retracts. Instead I got a plane that had a 'cool' factor of retracts but performance, because of the weight of the gear provided IN THE KIT, its performance was no where near that of the stock airplane with the same ST 91 engine.
That is just my opinion
I'd like to make it clear that my comments apply ONLY to the Goldberg kitted and released "Deluxe" version. Before Paul's death the company had been on a roll with some absolutely fantastic designs.
The Deluxe release appeared to be a last shot at getting more mileage out of the Tiger. They didn't even bother to redesign the plans or the instruction manual, They just tossed in an addenddum:
http://manuals.hobbico.com/gbg/gbga0062-manual.pdf
All I know is that I loved the stock tiger and expected more from CG inc when they added retracts. Instead I got a plane that had a 'cool' factor of retracts but performance, because of the weight of the gear provided IN THE KIT, its performance was no where near that of the stock airplane with the same ST 91 engine.
That is just my opinion
12-04-2014, 07:53 AM
#1024
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That has been my experience too . They are just not worth messing around with in a sport plane . I will save mine for a scale show plane .
12-04-2014, 01:46 PM
#1025
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I intend to use the ones in my kit, as I would like to gain experience of using retracts. I would like to say that I do like hearing all the different takes from people in the forum. As a tool maker I use to work with some very talented machinist and each has his own way to machining the same part, but each equally as well as the other. I guess what I am saying is that people like doing the same things with different approaches, but neither is actually wrong.