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Seagull Models Challenger (.40) any good?

Old 02-24-2017, 06:38 AM
  #26  
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Originally Posted by FlyBoy95
n0mats

I am not overly sure if the set up would be suitable, i guess one method would be to test it.
Looking at some information the 580Kv would turn 580rpm. however I can't be certain.
I don't play with prop electrics, mainly ducted fan. I would ask someone who has a more
in depth knowledge.
Maiden today sir and fly great🙂
Old 01-29-2018, 08:49 AM
  #27  
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still flying mine, had it put away for nearly a year, but enjoying it agin now!
Old 04-09-2024, 04:32 PM
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Hi FlyBoy95
I just came across this thread while building my Seagull Challenger.
I am installing an OS55 in my model, and much like yourself , I believe this model has not really been designed correctly for IC engine powerplants.
On checking the centreline of fuel inlet on the carburetor to the centreline of fuel tank (as supplied) measurement, there is a -40mm height difference.
Typically a 5-10mm height difference is recommended for IC engine powerplants.

I saw further along in your thread that you lowered the engine, if so did this have any detrimental affects on the model.

The only other option I am seriously considering if i were still to go down the IC powerplant path is to raise the tank by the required 30mm and rebuild the long top hatch cover to accommodate the required height... not what i want to do
Old 04-10-2024, 01:57 AM
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Howzit Eggwithlegs,

Wow! Bringing this blast from the past back almost a decade later!
First off... I haven't flow since the global handbrake and lost almost everything in a shed fire soon after... but I still have this model... its twin unfortunately was not so lucky.
It was flown almost every week (maybe lose 4 weeks per year for study) until 2020 with multiple flights a day. With 55 it will be a rocket with almost limitless climb, with a OS46 it was quick, performed most aerobatics no issue and propped right could also hang comfortably. Recovers really well from some questionable flat spins with a tap of rudder and a nip of throttle. I didn't notice any major changes to the overall flight characteristics... other than not having the engine issues due to a high carb.

See the attached pictures (ignore the dust apparently in one of the moves it was uncovered).

I reduced the height of mount by ~15mm ( a quick measure) and appears to have a little more down thrust (i cant remember was a long time ago) and swapped the tank out to a Dubro fuel tank (either a 6 or 8 oz... extremely tight fit width wise.) a piece of blue foam under the tank and rubber band support. this increased the height of the fuel lines to top of the squared cut out , which i increased in height slightly.
I trimmed trimmed the inside bracing in the canopy as well to free some space up.

It's a bit rough.... doweled and filled the original blind nut spots (glass balloons and talcum with West 105 and 205) and then added an additional plate on the front above the mount location front and rear were sealed with a light seal of West 105 and 209.

I wish I could give you a bit more of the technical... unfortunately between time, 4 house moves and a fire, my build book and notes seemed to have vanished into the never never.

Side profile

top view with Dubro tank

Position of mounting screw location (list below the canopy lip)


Modified lower plate


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