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Member postings for jrman

Here is a list of all the postings jrman has made in our forums. Click on a thread name to jump to the thread.

Thread: Model enlargement
14/07/2018 22:17:24

No. The weight would increase by the cube of the linear enlargement i.e. 1.5x1.5x1.5 = 3.375. (all other things being equal)

Thread: Spruce or Obechi for a wing spar?
20/06/2018 19:28:03

Cyano is sometimes reluctant to give a good bond to spruce but can be improved by rubbing baking soda on to the joint before introducing the cyano.

Thread: Valve work
09/06/2018 17:39:25

My understanding (on OS's at least) is that the valve seat has a sharp edge and is not chamfered like a car engines valve seat. Grinding does little to solve the leak.

Thread: 'Returner's questions'
06/06/2018 21:06:57

I would boil ( about 5 minutes) the old nylon props to restore their moisture content before using them.

Thread: Suppliers of 35 mHz crystals
23/05/2018 18:08:15

Try Hobby Plastic.( MacGregor)

Thread: Can still climb tree's
16/05/2018 16:11:10

Look on the BMFA Club finder page for contact numbers of Southend Radio flying club and South Essex Model Aircraft society both of whom fly at Two Tree Island.

Thread: JR PCM9X11
03/05/2018 18:50:10

I'm intrigued Peter. It wasn't me but what was "I" doing?

03/05/2018 18:17:42

I've always found him very helpful but he is trying to run a business so don't expect a "screw by screw" explanation. He is one of this hobbies "nice guys"

Good luck.

03/05/2018 15:26:00

Worth a phone call to Mike Ridley at

You can call Mike between 9.30am and 4.30pm Monday to Friday on:

07708 436163 – Please only ring this number in the normal work hours above.

Thread: I think I've fried my RX but have I toasted the battery and servos as well?
01/05/2018 18:41:39

It's not a JR or Spektrum switch. It's a "clone" by Perkins. Not sure if the wiring connections or mechanics are different though.

Thread: acetate help please
30/04/2018 18:19:30

Balsa Cabin do a good range of thicknesses and sell by the single A4 sheet.

Thread: what grass treatment do you use?
26/04/2018 21:01:05

Nappies.wink 2

Thread: OS 120 FS Surpass mk 2
14/04/2018 10:01:59

I've been looking for a replacement pump unit (metal not plastic) for an OS 120 MkII engine. If anyone has one I'd be pleased to hear about it.

Thread: Are Willis Warbirds still trading?
08/04/2018 12:14:20

Not sure if Chris is still making kits but you can probably contact him through this link to 2018 show.

The other, totally different company, referenced in some of the posts is Warbird Replicas.

Thread: End for Maplins?
04/03/2018 10:04:58

Praktica ?

Thread: Coming back after 50 years: bit lost
17/01/2018 16:11:29

A better solution for holding the aerials in place is to fix a short piece of drinking straw or "snake outer" to the airframe and slide the aerial inside that. Taping is not a good idea as if you have "an arrival" the aerials may be torn out of the Rx.

16/01/2018 15:43:53

Don't want to worry you but didn't the FAKE Spektrum receivers have no orientation markings on them?

16/01/2018 13:47:49

Don't rely on just a flat piece of Velcro to hold the battery in place. IT WON'T. Use a velcro strap which goes around the battery and a suitable part of the airframe.

Thread: Thrust line wandering....
10/01/2018 19:04:44

Probably "Gyroscopic Precession.

Wikipedia can explain it better than I.

"Torque-induced precession (gyroscopic precession) is the phenomenon in which the axis of a spinning object (e.g., a gyroscope) describes a cone in space when an external torque is applied to it."

Thread: Servo cable tubes
15/12/2017 12:18:32

Ready rolled icing is on the same tubes. Been using them in built up wings for servo cable tubes as well.

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