Search: Posts Made By: JetPlaneFlyer
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Forum: Aerodynamics
08-13-2010, 08:37 AM
Replies: 20
Views: 4,200
Posted By JetPlaneFlyer

jerry, Great to hear that your model is...

jerry,

Great to hear that your model is performing well.

As for the seaplane... My instincts would be to add floats to lift the whole model out of the water. Failing that some sort of extension...
Forum: Aerodynamics
07-05-2010, 09:14 AM
Replies: 20
Views: 4,200
Posted By JetPlaneFlyer

Jerry, You will almost certainly need to move...

Jerry,
You will almost certainly need to move it a lot more than 1.5mm (1/16"). Move the CG in steps of around 3mm (1/8") but be prepared to repeat this adjustment a number of times. It's quite...
Forum: Aerodynamics
07-04-2010, 10:16 AM
Replies: 20
Views: 4,200
Posted By JetPlaneFlyer

The dive test is for establishing the correct CG...

The dive test is for establishing the correct CG position. If it pulled out quickly then the CG needs to move back... Adjusting the elevator without moving the CG just means the plane is trimmed to...
Forum: Aerodynamics
07-02-2010, 07:19 PM
Replies: 20
Views: 4,200
Posted By JetPlaneFlyer

Thrust offset is a tricky business on a plane...

Thrust offset is a tricky business on a plane where the motor is near the CG. The effect of the offset is less easy to predict than on a conventional plane where the prop is on the nose.

If it's...
Forum: Aerodynamics
07-02-2010, 06:08 PM
Replies: 20
Views: 4,200
Posted By JetPlaneFlyer

Here's what i mean by the thrust offset, this is...

Here's what i mean by the thrust offset, this is viewed from above:

(ps.. 'thank you' button is bottom right corner.. thanks:D)
Forum: Aerodynamics
07-02-2010, 07:53 AM
Replies: 20
Views: 4,200
Posted By JetPlaneFlyer

Sounds like you are nose heavy. The model should...

Sounds like you are nose heavy. The model should balance dead level when supported on the position indicated on the plan. Even then the plan positions are often very conservative and moving the CG...
Forum: Aerodynamics
07-01-2010, 07:56 AM
Replies: 20
Views: 4,200
Posted By JetPlaneFlyer

The wing loading looks ok.. All i can say is if...

The wing loading looks ok.. All i can say is if the plane balances ok and all flying surfaces and engine thrust line are 'straight' and 'as new' and control surfaces move and centre ok.. then there...
Forum: Aerodynamics
06-30-2010, 11:50 PM
Replies: 20
Views: 4,200
Posted By JetPlaneFlyer

Or have you added 'stuff' to the model and made...

Or have you added 'stuff' to the model and made it overweight?.. That would certainly explain the diving when launched. If you try to fly slowly with an overweight model would explain the spins too...
Forum: Aerodynamics
06-30-2010, 09:51 PM
Replies: 20
Views: 4,200
Posted By JetPlaneFlyer

It's easy to see if the CG is in the right...

It's easy to see if the CG is in the right place.. Just balance the model on your fingers and see if it balances level with your fingers on the correct position as indicated in the plan/instructions....
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