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Revolver Pusher type Autogyro trainer

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Chris Dowell17/11/2019 23:23:15
110 forum posts
47 photos

See if this works...

o2czz2XPNM never can post you tube on this site.

Chris...

Richard Harris19/11/2019 09:31:15
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2063 forum posts
1895 photos

Chris,

This explains how to add a video to a post.

Trevor,

Sounds like you need to move your motor further out to the right. As Chris suggests (and hopefully he will manage to upload the video surprise), tethering the model via a string on the rotor spindle and powering the model adjusting the motor until it sits stationary.

Your model will fly ok as it is but you will get a slight left yaw as you bleed off the power and vice versa as you increase RPM. Right hand roll turns will almost certainly be effected as your set up stands but they will always require a little more control input than left handers due to the CCW blade rotation.

Rich

Trevor19/11/2019 09:44:22
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392 forum posts
57 photos

Thanks for the responses. I had read about the suspension method of adjusting the thrust line but frankly didn't fancy the prospect and had enough confidence in Rich's recommended starting point to do the initial flight tests and hopefully fine tune the setup from there.

Rich, thanks for confirming that I need more motor offset rather than less. The motor is fitted with Malcolm's adjustable motor mount so I can easily move it a bit, although the motor mount is already close to the edge of the bulkhead. I didn't notice any significant change in yaw trim with power so I don't think it can be too far out.

With regard to the rudder trim, the irony is that when I first fitted the tail surfaces to the boom they were off square and I spent a fair bit of time fiddling around to square everything up. Had I not bothered, there would have been a bit of offset built into the fins from the outset! Anyway, I'll keep practising the right hand circuits.

Cheers,

Trevor

Richard Harris19/11/2019 11:58:37
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2063 forum posts
1895 photos

Trevor,

Everyone goes their own way which adds many variables, motor KV, prop diameter/pitch etc, these all effect the offset which is why it is necessary to 'fine tune' each particular model.

Rich

Steve Jones 219/11/2019 19:45:29
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530 forum posts
387 photos

Both my revolvers have a left rudder offset. Quiet large and on the first Malc at coolwind provided a motor plate with a larger right offset . Almost 12mm

it made little difference to the rudder offset so I ignore and just go fly

does this offset affect flying trim with power , yes but who cares .. I just get on with it and fly it

my go too models and great fun .. modelling is not an exact science and I would rather fly and have fun

steve

Chris Dowell20/11/2019 01:00:17
110 forum posts
47 photos
Chris Dowell20/11/2019 01:02:18
110 forum posts
47 photos

laugh

Chris Dowell20/11/2019 01:11:47
110 forum posts
47 photos

Thanks again Rich...just hope I can remember...thought I might show these also.

Chris...

Chris Dowell20/11/2019 01:13:30
110 forum posts
47 photos
Graham L20/11/2019 18:35:48
32 forum posts
8 photos

Hi Trevor

You will need your motor as far to the right as you can and even with this you will still need rudder offset to compensate for the spiral slipstream on the fin and rudder. This is a fact of life with most short boom pushers both model and full size. On my Revolver the offset is only needed above 15-20% throttle and so I have programmed a throttle rudder mix in the tx to remove the offset below this. Using a Spektrum DX8 the activated mix screen reads- throttle rudder, rate 0, rate 9,offset -15, trim act and programmed on gear switch 1 giving the option to switch the mix off. Everyone’s set up is a bit different and would need fine tuning for each model but it certainly significantly reduces the tail yaw when throttling right back. As Steve says you could just manually compensate on the sticks but feel that having paid out for modern radio I might as well use its benefits. If you don’t get on with it then at least you can switch the mix off.

Graham

Trevor20/11/2019 19:01:54
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392 forum posts
57 photos

Thanks Graham. I’ll offset the motor as much as possible without it looking silly and then take it from there. I do have the facility to program a throttle to rudder mix as you describe (Jeti radio) so will bear that in mind.

Trevor

Richard Harris21/11/2019 21:27:40
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2063 forum posts
1895 photos

Chris,

A rare event from Mr Hand launch! ,Glad you figured the video embedding out and thanks for posting them thumbs up

Rich

Chris Dowell21/11/2019 21:43:23
110 forum posts
47 photos

Mr hand launch....I like that .smiley

Well I'm glad you can still see the video ..cos all I get is a black boxsad

must be a location thing...…….

Chris...

Chris Dowell21/11/2019 21:52:47
110 forum posts
47 photos

Don't panic...all fixed I can see..blush

Chris...

Trevor24/11/2019 17:11:00
avatar
392 forum posts
57 photos

With a bit more motor offset, the rudder trim is reduced but not quite eliminated. I didn’t notice any throttle/yaw coupling and circuits both ways are now okay. Just as well really since today’s wind direction necessitated taking off straight into a right hand circuit. In spite of the gloomy conditions, clubmate Mike managed a few photos:


2b806dc9-d043-4f0a-a808-1fc623feee48.jpeg
d103cd56-560a-43ec-a64c-884808b3f7a9.jpeg
They’re a bit blurry but do show off the coning angle rather well.

Trevor

 

Edited By Trevor on 24/11/2019 17:12:11

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