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No problem there Olmod. I'll bet those nuts and screws are metric. I'll replace them with SAE thread nylon (I have a bunch). Early morning and cold here 26F. Will try to remove those set screws later... hope they cooperate.
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I had to drill one out.........the blind nuts are 4mm and you will have 'fun' getting the tail ones out...just go a buy a 4mm medium tap and very carefully clean them out
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Okay so heres my story of my Minimoa now shattered in many pieces on its maiden. Basically I tried to hand launch my self and right after launch it headed straight up into a stall and as I quickly went with full down elevator it came down but in a tight turn and just as I was gonna get it recovered the wings separated from the fuselage and that was the end of the story. I knew those two loose plastic wing screws seemed to little.
As Im still fairly new to rc foamies, what can I do if I order another to get those wings stuck on better. Had thought about some real nice Velcro so I could still remove them for transport or is there a good glue I should use to coat the plastic screws with? Thanks! PS Whats the proper orientation/bend needed for the elevator/rudder push rods? |
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Last edited by kola; Feb 07, 2011 at 09:00 PM.
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kola,
So sorry to hear about your disastrous maiden. Unfortunately it happens sometimes. The tendancy for the Minimoa to pull up sharply when full throttle is applied is well dcoumented. Did you use full throttle? I have been launching at just above 1/2 throttle, and have found that only a steady throw is necessary to get a comfortable launch without the model pulling excessively upwards. Why the wing seperated is a bit of a mystery. As far as I know, no-one is really having a problem with the wing mounting screws, except that quite often there is some glue stuck in the nuts in the fuselage that needs to be removed to be able to easily insert the screws. Otherwise, I do not think you need to do anything to the screws. I do not quite understand your final question regarding the push rods. I did put a "dog-leg" in the rear end of my elevator push rod after it exits the fuselage so that it would move more freely. Regards, Harrow. |
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That might be my problem as I didnt see any nuts that the plastic screw screw into, only had em skrewed in the two holes?
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Sounds like your screws were just tight in the foam holes and slipped out. Underneath the foam holes are two nuts that are glued to the foam. If you put your fingers underneath you can feel them. They are square nuts. I pulled mine out because they were full of glue and the screws could not go into them. Then I was actually able to just press them back into place because the contact type glue that they were held in with was still sticky enough. You really need to be sure that the plastic screws go into the nuts properly. I suggest you first try screwing the screws into the nuts (via the holes) without the wing in place, that way you will more easily be able to tell if the screws are actually going into the nuts, or if they are just pushing the nuts out of the way (which is what mine did when the nuts were first full of glue.)
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I put a cork block on the ply with holes for the bolts so that I could put it in the vice until the glue dried. That is one option if the nuts are pulling through the foam. |
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Last edited by Firepower; Feb 08, 2011 at 05:56 AM.
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Sorry to hear of your crash Kola. I never even attempted to use the stock wing attachment method after reading of earlier problems. I epoxied an 1/8" ply panel similar to Firepower's fix except I put two blind nuts underneath and epoxied two dowels through the ply and down into the foam for additional support. Here's all my fixes. Works great. I use only two cell lipos and launch at part throttle.
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Nah looking at my now busted plane their were absolutely no plastic nuts under the holes whatsoever.
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I would have gone for one of these where there are MUCH less problems for someone learning. http://hobbycity.com/hobbyking/store...idProduct=8359 I suppose you read one of the problems why the Minimoa climbs steeply is that some people screw down the front tailplane bolt too tight which changes the angle of the tailplane. In the old days we only had bungies, cliffs to throw them off or just chuck them for a short flight. So what is wrong with practicing your landings first. For example, just chuck the plane and land it a number of times so you understand how to control it. In long grass can help if you are learning. Some will tell you you should have the motor on to keep it off the ground - Yeh and smash it in the ground harder. How you do it is do a short run and throwing very hard at the horizon (NOT above it) without the power on and once you have control of the plane slowly apply the power. When learning it also helps to have someone throw it for you AT THE HORIZON (not up) then if it is going down you can quickly give just a bit up (no stalls). I usually just hold a SMALL amount of up on launch and drop it off if it is climbing too much. (Everyone has their own preference) Once you have mastered throwing and landing you can add the motor. The video was done as many demolish their planes on their first throw from either stalling it, just powering over to one side hard into the ground or even doing a loop and crashing, is common with a Minimoa. This was a calm day so twice the height can be obtained when throwing the plane hard when there is a bit more breeze and with a larger 2 meter plane three times the height can be obtained which gives you more time to slowly put on the power. With my old Trident I could throw it against a stiff breeze and it would go up over 20 metres. That was before motors were invented. So get someone to throw it - control it and then add a little bit of motor. Do not panic and land if you have problems. It is simple. You will probably need the volume up loud to here when the power is put on. I'll keep trying and do a better video later.
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Thanks alot, Ill give that a go when my new one comes in And yes looking at my old one I did have the tailplane screwed on too tight and was angled to make it climb. Second times the charm and yeah tried to get my roomate to come with me to launch it be he was too lazy.
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Good advise Firepower
The thing to achieve when launching is to try and have the plane at ITS FLYING SPEED , if its thrown too hard it will zoom up and prob stall if your not ready for that The best thing is to find a gentle slope a launch the plane from the top of a small hill so it will glide further and you will have longer to trim and get the feel of it....preferably a gentle slope with long grass Ian |
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If you have the tail plane totally level the plane will fly straight at the horizon. After it has airspeed when it is thrown and you can see it going at the horizon you can pull in a LITTLE bit of up. If the plane is not traveling forward fast enough and you pull in up, you end up with a stall like you did. Some people crash into the ground and others go up. The Minimoa has a tendency to go up. If you bought any other plane you probably would not have crashed it. But if you had a reasonable amount of up pulled in when you threw it, most planes would do what yours did. Like I said get someone to throw it at the horizon and as you have both hands on the controls to control it. It would be good if you could have someone that knows how to fly assist with the first flights. Also it is best to stand behind the person throwing it. In the following link we took photos of the tail planes as I had a problem with mine. Mine should be correct for next time. If you wanted to take a photo of the tailplane of the new one or even the old one also so that people can comment on the angle. It may be worth it at least on the new one. If the tail plane is wrong chances are you will crash again. This is very important. Like SON OF PALEFACE said long grass is good if available and a little slope helps. (only a very little slope) ANY YOU MUST THROW DIRECTLY INTO THE WIND and not a bit to the side. All the best. https://www.rcgroups.com/forums/show...287892&page=21 |
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