Why would Hobbico do this? - RCCanada - Canada Radio Controlled Hobby Forum
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Old 06-28-2004, 03:05 PM   #1
Flyin High
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Why would Hobbico do this?

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I recently went out and bought a Hobbico Avistar. It all assembled fairly well and it does fly great... But after flying a few times, I have discovered a pretty large problem. (*I am new to this hobby, so excuse me if my terms are incorrect)...... I have been haveing a lot of troubles with the engine dead sticking on me, I replaced my fuel lines and still had the problem. Then I was told that the gas tank has to have foam in between it and the plane. But hobbico made the gas tank squeeze so close to the peices of ply ( What I would call ribs in the fuse) that you couldn't fit a piece of paper between them. So I had to cut it all away so I could wrap the tank in foam, but I had to cut so much away, that the front of the plane is going to signiffcantly weaker. Why wouldn't hobbico give me room for foam!?!?!?!
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Old 06-28-2004, 03:40 PM   #2
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Are you getting air bubbles in the fuel line? if you aren't then there is no need to use foam. In my experience i have always used foam but like i said if there is no bubbles then that isn't your problem. you may have sucked up some dirt and is now causing a over heating problem or mabe a to lean of mixture. Just my Two cents.
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Old 06-28-2004, 04:30 PM   #3
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sorry, I forgot to add that import part to the story.... Yes, I had a lot of bubbles in the fuel line, that is why I replaced my fuel tubing, and now added foam. I hope it works.
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Old 06-28-2004, 04:41 PM   #4
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A less intrusive repair would have been to put in a smaller tank -- & I agree that Hobicco should not have done that.

Having said that, I have owned two Hobbico aircraft with exactly that "fit" & have not experienced any fuel foaming problems. These aircraft are now several years old & have been heavily modified -- except for the fuel tanks -- they still work just fine.

Maybe your prop has been dinged enough to unbalance it.
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Old 06-28-2004, 05:43 PM   #5
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Keep in mind that these are low cost planes. nothing would be added unless it is necessary. I am sure the plane would run just fine as long as all parts are working perfectly. Something on your plane is a little out

Your prop could also be part of the problem. Even brand new props could be unbalanced to the point of causing vibration at the right RPM. Fixing the tank may just be masking the real problem.

On the other side, congratulations on fixing the problem on your own. This hobby is all about resolving problems on your own or with fellow pilots. That's how you learn.
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Old 06-28-2004, 08:57 PM   #6
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Well I took it out tonight, and it was obviously the problem becuase I had much better luck.

BritBrat, The idea of getting a smaller tank crossed my mined, but I was worried about my flight time. Would getting a smaller tank (a few ouces smaller) significantly reduse my flight time???
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Old 06-28-2004, 09:13 PM   #7
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your flight time? yes but....

it would obviously reduce the amount of fuel your plane could carry. this would in fact decrease flight time, but....

do you fly at full throttle all the time? do you always use all of the fuel? what engine do you have? etc.

only once did i run my tank dry in the air. i don't even come close in my newer plane. and i use the count-down timer on my watch to let me know when i've been up for long enough.
i do like to buy other peoples junk...

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Old 06-29-2004, 06:47 AM   #8
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The Avistar with a 46FX engine and stock tank gave about 28 minutes of flight time, running about 1/2 throttle. This was a broken in engine running just a bit rich. My family has had 3 stock Avistars and 1 scratch built and never had the issue with the foaming although I was able to fit some foam top and bottom, just not the sides.

Hope your issue gets resolved as this is a great plane. (no pun intended)

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Old 07-02-2004, 12:51 AM   #9
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I also have a hobbico avistar and have no problems with the fuel tank foaming up the fuel i'm running a gms .47 and get about 30 mins out of a tank. the plane flys and performs very well for a advanced trainer i have wrung out this plane and it still goin strong only thing i did was glue the tail surfaces together to the fuse as the bolts on the rtf kit did not hold very well horizontal stab moved back and forth not any more
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Old 07-02-2004, 08:52 PM   #10
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Fuel foaming...

I always have difficulties with models that run for 1/2hr; why NOT cut the tank size, and only fly for 20min?? Clearly few of you guys have flown small models (1/2A), where 10min flights and deadstick landings (plan ahead!!!) are normal. I am fine with a sailplane flying for an hoiur or more, but I think I would get bored with a power model with that kind of endurance... :P
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