RE: CMP 160 sized Texan

RE: CMP 160 sized Texan
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RE: CMP 160 sized Texan - 6/6/2007 1:54:39 AM

harleydoberman

Posts: 26
Joined: 8/22/2006
From: Lumberton, NJ, USA
Status: offline

Here are some pictures of the engine on the Texan Eric is building for me.

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(in reply to Trollmaster)

Post #: 201

RE: CMP 160 sized Texan - 6/10/2007 5:36:36 PM

harleydoberman

Posts: 26
Joined: 8/22/2006
From: Lumberton, NJ, USA
Status: offline

Ready and waiting for the Prop and Prop Hub.

Tony in Shamong

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(in reply to harleydoberman)

Post #: 202

RE: CMP 160 sized Texan - 6/27/2007 7:53:02 PM

waldo

Posts: 38
Joined: 4/3/2002
From: Dublin, IRELAND
Status: offline

Hi Harley & Eric, I've just fitted my 620s to the T6 wing pretty much as you guys did . I'm having some problems with the locks binding when the units are bolted down in the mounts but work fine on the bench. It appears that the black plastic block may be distorting slightly when bolted down making the sliding locks bind. Any thoughts?

(in reply to harleydoberman)

Post #: 203

RE: CMP 160 sized Texan - 6/27/2007 10:46:32 PM

Meschmidt

Posts: 371
Joined: 9/5/2002
From: Houston, TX, USA
Status: offline

Waldo, It is important that the mounting area be considerably flat and level on all four mounting holes. Use small washers under any "soft feet" to prevent binding or twisting of the retract during tightening of the mounting screws. Hope this makes sense. Paul

< Message edited by Meschmidt -- 6/27/2007 10:48:07 PM >

(in reply to waldo)

Post #: 204

RE: CMP 160 sized Texan - 6/28/2007 3:21:21 PM

ElectRick

Posts: 477
Joined: 8/31/2002
From: Jacksonville, FL, USA
Status: online

You could also use a thick epoxy and microballoon mixture on the rails to 'shim' the surfaces level. Lightly grease the retract's mating surface to the rails with petroleum jelly or similar (or use plastic wrap), and sit the retract in place after applying a medium light coat of the epoxy to the rails. Sit the retracts in place, weight or clamp them down in place LIGHTLY so as not to distort them, then pop them loose after curing. Clean up any squeeze out, and you're good to go.

Rick

(in reply to Meschmidt)

Post #: 205

RE: CMP 160 sized Texan - 6/28/2007 4:05:14 PM

waldo

Posts: 38
Joined: 4/3/2002
From: Dublin, IRELAND
Status: offline

Thanks guys. I was thinking along the lines of using an epoxy of some kind as a levelling compound as suggested. Maybe Plastic Padding Chemical Metal. I was surprised to find retracts of this price and apparent quality would distort so easily. Appreciate the help.

(in reply to ElectRick)

Post #: 206

RE: CMP 160 sized Texan - 6/29/2007 5:02:55 PM

RCPILOT78

Posts: 281
Joined: 4/20/2005
From: new port richey, FL, USA
Status: offline

I am getting ready to maiden my AT-6 in the next two weeks...I have already run my G-26 and let me say it is a sweet engine..starts every time I had to add approx 12 oz of led in the nose to ballance...probably because I added flaps which changed the CG. will keep you informed on the maiden RCPILOT78

(in reply to waldo)

Post #: 207

RE: CMP 160 sized Texan - 6/29/2007 5:51:29 PM

waldo

Posts: 38
Joined: 4/3/2002
From: Dublin, IRELAND
Status: offline

Good to hear from you again. The thread had gone a bit dead. I look forward to hearing how the first flight goes. What do you reckon the weight is now with the mods. The problem with my 620 retracts is solved. The mounting flanges were not at 90 deg. to the body resulting in some strain when bolted down. BTW what I thought was binding in the lock mechanism was actually movement of the cylinder mounting frames. This small movement was changing the angle between the piston rod and the retract crank resulting in some small reduction in force appllied to the lock. While the 620s are nice looking mechanisms the fabrication could do with heavier guage material.

(in reply to RCPILOT78)

Post #: 208

RE: CMP 160 sized Texan - 6/30/2007 6:01:40 AM

RCPILOT78

Posts: 281
Joined: 4/20/2005
From: new port richey, FL, USA
Status: offline

Waldo..she weighs in at 16lbs....with the retrects and the added flaps and flap gear it came out heavier than the 12.37lbs

(in reply to waldo)

Post #: 209

RE: CMP 160 sized Texan - 7/1/2007 10:39:57 AM

waldo

Posts: 38
Joined: 4/3/2002
From: Dublin, IRELAND
Status: offline

I think some of the Midwest Texans came out at this weight or even heavier and that kit was designed witout flaps so your model shoul do fine. Let us know how the first flight goes. Did you mount the G26 soft or hard and what did you do for glitch suppression. I'm using the same engine but its my first gas plane so I'm learning as I go.

(in reply to RCPILOT78)

Post #: 210

RE: CMP 160 sized Texan - 7/3/2007 12:32:35 AM

Eric.Henderson

Posts: 1403
Joined: 9/10/2003
From: Mt Laurel, NJ, USA
Status: offline

The Nitro AT-6 Texan was given a test fight yesterday.

The OS BGX started first spin and was flawless through the whole thing.

Take-off required no rudder. The tail was held a little low beause the 20 x 8 Mezjlik had very little ground clearance. My 10X24 guided the R7000 and felt very tight.

The flight was very easy on the sticks. The gear was pulled up as soon as it passed the end of the runway. Trim, was about two beeps of down-trim.

The airplane tracks well and looks wondefull in the air. The wings are very visible. She rolls smoothly and will do really big loops with the humongous OS on the front. The BGX made me put the 3600 mAh pack towards the rear of the wing-seat opening.

This is one of the better planes that I have seen from "Nitro" and the finish is very pleasing to the eye. The BGX is fully cowled so I made a vent behind the head. The cowl was kept clear of the fuselge to also assist in getting air out of the cowl. The BGX never threatened to get hot. And this was after only one ground run.

Slow speed was stable and a little power was priudent when you went into the turn (when flying slow). High speed was throaty and super to watch and fly. It was not my plane by the time it was flown so I put on my "baby" hat and was very conservative.

Landing was, line-up--throttle back--skim and land. (always keeping that prop clear of the ground) - It will be changed to an 18 x 10 or 12 ASAP).

Glad we went BGX.

Regards and thanks for the hint - - Eric.

_____________________________

If it has wings I''ll fly it....

(in reply to Trollmaster)

Post #: 211

RE: CMP 160 sized Texan - 7/3/2007 2:48:07 AM

Meschmidt

Posts: 371
Joined: 9/5/2002
From: Houston, TX, USA
Status: offline

Eric, good job on the maiden flight. It went alot like mine, smooth and uneventful. Put a couple more flights on my AT6 Saturday. I installed a Dub Jett in cowl muffler on the Moki 1.8. Now it runs a lot quieter than most 40 size engines and can only hear the prop noise. Picked up 500-600 more rpms too. This plane flies like a Cadillac and the owner will enjoy it a lot! Paul

(in reply to Eric.Henderson)

Post #: 212

RE: CMP 160 sized Texan - 7/3/2007 1:51:47 PM

Eric.Henderson

Posts: 1403
Joined: 9/10/2003
From: Mt Laurel, NJ, USA
Status: offline

quote:

ORIGINAL: Meschmidt

Eric, good job on the maiden flight. It went alot like mine, smooth and uneventful. Put a couple more flights on my AT6 Saturday. I installed a Dub Jett in cowl muffler on the Moki 1.8. Now it runs a lot quieter than most 40 size engines and can only hear the prop noise. Picked up 500-600 more rpms too. This plane flies like a Cadillac and the owner will enjoy it a lot! Paul

I can't say we are quiet. The BGX with an OS "F" runs at almost all needle settings and keeps idling. Runing slightly rich it has a gas engine gurgle sound with the Bisson Pitts muffler.

The retract modifications worked out pretty good as well. You can see them working as you go up on the mains. The full size version must have been a blast for the pilots. This is a big trainer!

Regards,

Eric.

_____________________________

If it has wings I''ll fly it....

(in reply to Meschmidt)

Post #: 213

RE: CMP 160 sized Texan - 7/4/2007 4:44:16 AM

RCPILOT78

Posts: 281
Joined: 4/20/2005
From: new port richey, FL, USA
Status: offline

I also maidened my at-6 yesterday...flight went well the G26 ran well plenty of power used 1/2 throttle and it was a rocket...I had to remove some nose weight it was a bit nose heavy...I ballanced it at 122mm from the leading edge thats about mid range between the published 117-125mm....and it was perfect..am pleased with the plane as mentioned in the prior post it tracked straight down the runway with little rudder input and that was on asphalt runway.. I did put in the 2degrees of right thrust but no down thrust as suggested in the plans no noticable problems with no down thrust...did some minor adjusting and tweeking for the next flight..I did use soft mounts but mine were scratch built I obtained the rubber grommets from ACE hardware store and made my own...they are firm.. the model manufactured ones are too soft .all you want to do is isolate the high frequency vibs from your air frame...when you use too soft a rubber mount you create more vibration..will have some pictures later RCPILOT78

(in reply to Eric.Henderson)

Post #: 214

RE: CMP 160 sized Texan - 7/4/2007 4:54:51 AM

RCPILOT78