Hi there
Will a scale main gear, with 2 inline wheels give problems on a rough, bumpy grassfield?

I was wondering if the gear would have a tendency to twist 90 degrees..

There is a spring system, making the second wheel touch the ground first, and generally carry most load, so I assume there is no problem, or?

2 aditional wheels generate more drag or resistance, and if the diameter of the wheels are small....the scenario is not better.- Make sure you gear bases are very strong....

Twist 90 dregrees? The best way to reduce this effect is by making sure there is not tow in or out in you mains. Make sure to have both mains very straight....

For what plane is that? I think I know but don't remember the name now

But even better solution is to.....drop a few lays of asfalt to you field ....or cut the grass...[&:]

Good luck.-

Thanks - perhaps one should mount a single wheel for that grassfield, and save the scala retracts for asphalt then..

The grass is smoth, but the gound below is uneven. Due to a common danish pet: The Mole, and due to high ground water.
It´s a Viggen - (have not bought anything yet, just tjecking erveryting first) - here is the bigbrother:

Hi Lars

That scale gear will be perfect for grass field.

Are you thinking about getting Viggen. Like this one.

Thanks, and yes I was thinking - often it just stops there, otherwise I'd have just almost as many models as SJN ..
- You got mail

Grassfield operations will be no problem at all. I flew a 1/10 Saab Viggen for 3 years often from different grass fields, first with Dynamax fan, later converted to KJ66 power. Gear was homemade in accordance with Einar Johnson plans and look very similar to yours. Centre bogey hinge also had some play which didn´t seem to grow in the years, I guess that somehow the forward and aft wheels balance each other, just like an all plane elevator? (I even remember that I had a 1 degree tow-in set-up)

Best regards,
Gerald

Gee, That gear looks very familiar! For the first flights, I had the toe-in set to zero. The model seemed a bit skidish on takeoff. Reluctantly, I adjusted the gear to have about 2 degrees of toe-in and it tracked great on the pavement. I guess that the toe-in loaded the gear so that it didn't "shimmy".

John

thanks both