× Here's one for the serious builders. Show us your ideas

SAMS Models Lacey M-10

  • one tenor
  • one tenor's Avatar
  • Online
  • 2 Grigg
  • 2 Grigg
  • johnpcalex@gmail.com
More
29 May 2017 17:52 #76 by one tenor
Replied by one tenor on topic SAMS Models Lacey M-10
Really well done ! That looks a lot of rubber Andy how much is there ?

Anything will fly given enough power
Thanks: Andy Sephton

Please Log in or Create an account to join the conversation.

  • Andy Sephton
  • Topic Author
  • Visitor
  • Visitor
29 May 2017 18:58 #77 by Andy Sephton
Replied by Andy Sephton on topic SAMS Models Lacey M-10
Thanks John.

The model required a bit of nose weight to balance the extra rubber for outdoor flight which included a rear bobbin, plus a bit for the added detail at the back end. So the stats for outdoor flying are:

Total weight 208 gm
Added nose weight 9.8gm
Rubber 36 gm (12 strands 20" long of 1/8" tan Super Sport rubber with about 850 - 950 turns, approx 60% max available)
3/32" down thrust
Slight left rudder, slight down elevator
Flight path left/right
Flight time between 35 and 40" in still air (only 20" is required to return a flight score)

Please Log in or Create an account to join the conversation.

More
29 May 2017 22:47 #78 by Nigel
Replied by Nigel on topic SAMS Models Lacey M-10
Well done, Andy, your faith in the model type has paid off. Very stable and composed flight characteristics - stately I'd say.
Thanks: Andy Sephton

Please Log in or Create an account to join the conversation.

More
30 May 2017 07:16 #79 by Squirrelnet
Replied by Squirrelnet on topic SAMS Models Lacey M-10
It had not occurred to me that the model would need such radically different trim to fly outdoors including a big increase in motor size but I guess the still air conditions and confined space of a sports hall is very different to even the best still air conditions outside. The extra weight would help in moving air to ?

Please Log in or Create an account to join the conversation.

  • Andy Sephton
  • Topic Author
  • Visitor
  • Visitor
30 May 2017 13:35 #80 by Andy Sephton
Replied by Andy Sephton on topic SAMS Models Lacey M-10

Squirrelnet wrote: It had not occurred to me that the model would need such radically different trim to fly outdoors including a big increase in motor size but I guess the still air conditions and confined space of a sports hall is very different to even the best still air conditions outside. The extra weight would help in moving air to ?


You need to get the model up and out of ground effect when flying outdoors. Also, if there's any wind, you need a bit of extra height to counter the height loss in the first downwind turn. The result is a need for a lot more thrust than when operating indoors. To counter the increased thrust, you need down-thrust to stop the model pitching up. In the case of the Lacey, it needed an extra 3/32" packing at the top of the nose block.

The indoor motor was 4 strands of 1/4" and 2 strands of 1/16" Tan Super Sport, all being 26" long. Motor weight was 18.8gm, a smudge over half that for outdoor flying. In both cases I only used about 60 - 70% max turns (about 900 in both cases). It reduced the initial power burst and led to a smoother flight than if using limiting turns on the motor.

Please Log in or Create an account to join the conversation.

More
30 May 2017 16:39 #81 by boz
Replied by boz on topic SAMS Models Lacey M-10
jolly good show, a well deserved win. :woohoo:
Thanks: Andy Sephton

Please Log in or Create an account to join the conversation.

More
31 May 2017 00:43 #82 by Nigel
Replied by Nigel on topic SAMS Models Lacey M-10

Andy Sephton wrote: The indoor motor was 4 strands of 1/4" and 2 strands of 1/16" Tan Super Sport, all being 26" long. Motor weight was 18.8gm, a smudge over half that for outdoor flying. In both cases I only used about 60 - 70% max turns

Great strategising - enough is occasionally enough then...? :P :lol:
Well done again, N
Thanks: Andy Sephton, one tenor

Please Log in or Create an account to join the conversation.

  • Andy Sephton
  • Topic Author
  • Visitor
  • Visitor
31 May 2017 09:04 #83 by Andy Sephton
Replied by Andy Sephton on topic SAMS Models Lacey M-10

Nigel wrote: ....Great strategising - enough is occasionally enough then...? :P :lol:
Well done again, N


Ha ha. Thanks for the kind words, too!

The 'thrust' statement was first mooted by a colleague when we were test flying RAF and RN Harriers at Boscombe Down in the mid-eighties. It was a real privilege to fly a machine with a greater than 1:1 thrust weight ratio and I can say from experience that in that case, 'Too much thrust was never enough". ;) ;)

Please Log in or Create an account to join the conversation.

More
01 Jun 2017 12:12 #84 by Paul H
Replied by Paul H on topic SAMS Models Lacey M-10
Congratulations Andy, a great result. Hope you manage to hang onto your Lacey, I lost my electric version at Old Warden May Fly the other week in a thermal!

Are you going to build an RC version for the Scale Indoor Nationals, could be very successful there as well?

P

Please Log in or Create an account to join the conversation.

  • Andy Sephton
  • Topic Author
  • Visitor
  • Visitor
01 Jun 2017 13:12 #85 by Andy Sephton
Replied by Andy Sephton on topic SAMS Models Lacey M-10
Thanks for the kind words Paul - I see that that was your first post here, so Welcome! If you get a minute, please would you consider posting an introduction here:

www.aeromodellers.co.uk/forum/thecafe/10...-yourself?start=1500

As for the Lacey, we intend to build electric, CO2 and IC versions for both FF and RC as part of the development process for the kit. So next year's Scale Indoor RC Nats (SIRCN) may be the venue... I already have a 20" RC version 90% completed. It was destined for this year's SIRCN but life just got in the way. Thinking about it, the 30" may be an even better proposition. After stripping out the rubber motor, prop, bushing and rear peg, I should have about 50gm available for RC gear, motor, hinges and links. Hmmmmmmm............ ;) ;)

Please Log in or Create an account to join the conversation.

  • one tenor
  • one tenor's Avatar
  • Online
  • 2 Grigg
  • 2 Grigg
  • johnpcalex@gmail.com
More
01 Jun 2017 13:51 #86 by one tenor
Replied by one tenor on topic SAMS Models Lacey M-10
And the nose block Andy a couple of more grams there .

Anything will fly given enough power

Please Log in or Create an account to join the conversation.

  • Andy Sephton
  • Topic Author
  • Visitor
  • Visitor
20 Jun 2017 10:03 #87 by Andy Sephton
Replied by Andy Sephton on topic SAMS Models Lacey M-10
Picked up the certificate at a BMFA Scale Technical Committee meeting over the weekend. :) :)

Attachments:

Please Log in or Create an account to join the conversation.

More
20 Jun 2017 10:04 #88 by Mike Rolls
Replied by Mike Rolls on topic SAMS Models Lacey M-10
Well done!
Mike

The older I get, the better I was!
Thanks: Andy Sephton

Please Log in or Create an account to join the conversation.

More
20 Jun 2017 22:23 #89 by Squirrelnet
Replied by Squirrelnet on topic SAMS Models Lacey M-10
Beautiful flights, a worthy winner
Thanks: Andy Sephton

Please Log in or Create an account to join the conversation.

More
21 Jun 2017 05:08 #90 by boz
Replied by boz on topic SAMS Models Lacey M-10
Ditto, boz. :) :) :)
Thanks: Andy Sephton

Please Log in or Create an account to join the conversation.

Time to create page: 0.703 seconds